CN114028750B

CN114028750B - Fire extinguisher for chemical laboratory

Info

Publication number: CN114028750B
Application number: CN202111324770.8A
Authority: CN
Inventors: 汪宏伟; 姜芬; 徐爱菊; 杨彬; 陈飞; 余樟庆; 毛锋顺
Original assignee: Zhejiang Chaoyi Fire Fighting Equipment Co ltd
Current assignee: Zhejiang Chaoyi Fire Fighting Equipment Co ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-08-19
Anticipated expiration: 2041-11-10
Also published as: CN114028750A

Abstract

The invention relates to the field of fire extinguishing apparatus. The invention discloses a fire extinguisher for a chemical laboratory, which aims to solve the problem that a device is difficult to regulate and control fire extinguishing raw materials sprayed out by the fire extinguisher according to the size of a fire source in the laboratory; the length of the material conveying pipe of the fire extinguisher is difficult to adjust according to people with different arm lengths; the fire extinguisher can receive the impact of high-temperature gas when spraying the burning things which may cause the influence to the efficiency of putting out a fire of the user. The invention consists of a lifting mechanism, an adjusting mechanism and a fine adjusting mechanism. The device makes the T-shaped hinged plate fold by holding the pressing handle, and makes the second fixing pipe move right to drive the L-shaped conflict rod to move right, makes the rotating pipe rotate anticlockwise to drive the pentagonal plate rotate anticlockwise, and then makes the lug slide in the limiting groove to make the crescent plate rotate anticlockwise, and then regulates and control the quantity of the device gas transmission in-process conveying pipe conveying fire extinguishing raw materials, and effectively and balancedly has put pressure according to the control of the fire source.

Description

Fire extinguisher for chemical laboratory

Technical Field

The invention relates to the field of fire extinguishing apparatuses, in particular to a fire extinguisher for a chemical laboratory.

Background

In various laboratories, the chemical laboratory has the greatest fire hazard due to the factors of large quantity, various types, complex experimental conditions and the like of flammable and explosive chemical dangerous goods. Therefore, fire is the most likely accident in chemical laboratories, especially organic laboratories, and most of the fire accidents are caused by improper operations when heating or treating low boiling point organic solvents.

Current partial fire extinguisher is through extracting the safety catch when using, hold and spray the hose and aim at the combustible substance, then press and aim at the combustible substance and spray, but the diameter of current fire extinguisher's conveyer pipe is fixed, be difficult to regulate and control fire extinguisher spun raw materials of putting out a fire according to the size of the fire source in the laboratory, the practicality is not good, the length of current partial fire extinguisher conveying pipeline is fixed, be difficult to adjust the length of fire extinguisher conveying pipeline according to the people of different arm lengths, current partial fire extinguisher can receive high temperature gas's impact when spraying the fire source, influence the efficiency that the user was put out a fire easily.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a fire extinguisher for a chemical laboratory, which solves the problems that the prior part of fire extinguishers are difficult to regulate and control fire extinguishing raw materials sprayed by the fire extinguisher according to the size of a fire source in the laboratory due to the fact that a safety pin is pulled out, a spraying hose is held to aim at combustible materials, and then a pressing handle is pressed to aim at the combustible materials for spraying, the prior part of fire extinguishers are fixed in diameter, the prior part of fire extinguishers are difficult to regulate and control the length of a fire extinguishing raw material according to people with different arm lengths, and the prior part of fire extinguishers are easy to influence the fire extinguishing efficiency of users due to the fact that hands are impacted by high-temperature gas when the prior part of fire extinguishers spray the fire source.

In order to realize the purpose, the invention is realized by the following technical scheme: the utility model provides a fire extinguisher for chemistry experiment room, includes the fire extinguisher main part, the C shape spout has been seted up to the side of fire extinguisher main part, the inboard sliding connection of C shape spout has C shape slide bar, the top surface fixedly connected with coil spring of C shape slide bar diaphragm, coil spring keeps away from the one end of C shape slide bar and the inner wall fixed connection of C shape spout, the both ends of C shape slide bar all are provided with the gyro wheel, the side of fire extinguisher main part articulates there is the mechanism of carrying and drawing, the side fixedly connected with gag lever post of fire extinguisher main part, the fixed cover of one end of fire extinguisher main part conveyer pipe has cup jointed adjustment mechanism.

Preferably, the lifting mechanism comprises two telescopic rods, one end of each telescopic rod is rotatably connected with the side face of the fire extinguisher main body, a reset spring is movably sleeved on the side face of each telescopic rod, one end of each reset spring is fixedly connected with the bottom of the side face of each telescopic rod, the other end of each reset spring is fixedly connected with the top of the side face of each telescopic rod, a cam is fixedly connected with the side face of the bottom end of each telescopic rod, the side face of each cam is abutted to the top of the C-shaped sliding rod transverse plate, and the round rods are fixedly connected with one side of each telescopic rod opposite to each other.

Preferably, the adjusting mechanism comprises a sleeve, the inner side of the sleeve is fixedly sleeved with one end of a conveying pipe of the main body of the fire extinguisher, two grooves are formed in the side surface of the sleeve, a round pipe is movably sleeved on the side surface of the sleeve, an inserting rod is movably inserted in the side surface of the round pipe, the side surface of the inserting rod is movably connected with the side surface of the round pipe through a spring, one end of the inserting rod extends to the inner side of the round pipe and is abutted against the inner wall of the upper side groove, a rectangular through groove is formed in the side surface of the round pipe, a touch plate is rotatably connected to the inner side of the rectangular through groove, the side surface of the touch plate is movably connected with the inner wall of the rectangular through groove through a first torsion spring, the left side of the touch plate is abutted against the inner wall of the lower side groove, a sliding plate is slidably connected to the inner wall of the rectangular through groove, the left side of the sliding plate is movably connected with the left side of the inner wall of the rectangular through a spiral spring, and a wedge block is fixedly connected to the top surface of the sliding plate, the side of wedge is contradicted with the right-hand member of touch-sensitive plate, the right-hand member of slide articulates there is first articulated slab, the one end that the slide was kept away from to first articulated slab is articulated with the side of pipe, the fixed cover in side of pipe has first fixed pipe, the side fixedly connected with connecting rod of first fixed pipe, the annular has been seted up to pipe side right-hand member, fine-tuning has been cup jointed in the right-hand member activity of annular side.

Preferably, the fine adjustment mechanism comprises a rotating pipe, the inner side of the rotating pipe is movably sleeved with the side face of the annular groove, a torsion spring is fixedly connected to the left end of the rotating pipe, the torsion spring is movably sleeved on the side face of the annular groove, the left end of the torsion spring is fixedly connected with the side face of the annular groove, an inclined groove is formed in the side face of the rotating pipe, an L-shaped touch bar is slidably connected to the inner wall of the inclined groove, a second fixed pipe is fixedly connected to the left end of the L-shaped touch bar, the second fixed pipe is movably sleeved on the side face of the circular pipe, a T-shaped hinged plate is hinged to the left end of the circular pipe, the side face of the T-shaped hinged plate is movably connected with the side face of the circular pipe through a pressure spring, one end of the T-shaped hinged plate is hinged to the side face of the circular pipe, a pentagonal plate is fixedly connected to the right end of the rotating pipe, a limiting groove is formed in the side face of the pentagonal plate, and a lug is slidably connected to the inner wall of the limiting groove, the right side fixedly connected with crescent moon board of lug, the right side of crescent moon board is rotated and is connected with and blocks the pipe, block the inboard of pipe and the one end fixed connection of connecting rod, block the right side fixedly connected with conveyer pipe of pipe.

Preferably, the limiting rod is C-shaped and is arranged on the outer side of the telescopic rod.

Preferably, the blocking tube has a truncated cone shape.

Preferably, the number of the inclined grooves is three, and the three inclined grooves are distributed annularly at equal intervals.

Preferably, one end of the T-shaped hinge plate is hinged with a pressing handle, and the side surface of the pressing handle is connected with one side of the first fixing pipe and one side of the second fixing pipe in a sliding mode.

Advantageous effects

The invention provides a fire extinguisher for a chemical laboratory. Compared with the prior art, the method has the following beneficial effects:

(1) this a fire extinguisher for chemistry experiment room makes T shape articulated slab folding through holding the pressure handle, and make the fixed pipe of second move to the right, it moves to the right to drive L shape conflict pole through the fixed pipe of second, make the rotating tube anticlockwise rotation drive pentagonal panel anticlockwise rotation, and then make the lug slide in the spacing groove and make crescent moon board anticlockwise rotation, and then regulate and control the volume of putting out a fire raw materials to device gas transmission in-process conveyer pipe transport, effectively balanced ground has been according to the control of burning things which may cause a fire disaster and has been put pressure, can not blow the equipment that turns over in the protection area during messenger's gaseous fire extinguishing agent operation.

(2) This a fire extinguisher for chemistry experiment room impels the slide to remove left through pressing down first articulated slab, drives the wedge through the slide and moves left and impels the left side perk of touch panel, and the pulling pipe is convenient for extend the length that sleeve pipe and pipe are constituteed, is convenient for adjust the length of device conveyer pipe according to user's arm length when putting out a fire through the device.

(3) This a fire extinguisher for chemistry experiment room is through holding tightly first articulated slab and T shape articulated slab, and the left side perk that makes the touch panel through the folding length that makes the sleeve pipe and pipe constitute of first articulated slab extends, then makes the pentagonal slab move crescent moon board anticlockwise rotation through the folding of T shape articulated slab, carries the volume of putting out a fire the raw materials to the conveyer pipe and regulates and control, and the device uses simple and conveniently, and reduces hot-air through blockking the pipe and touch the possibility that the user was on hand, guarantees the efficiency that the user was put out a fire.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a partial perspective view of the present invention;

FIG. 3 is a partial perspective view of the present invention;

FIG. 4 is a partial perspective sectional view of the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 4 according to the present invention;

fig. 6 is a partial perspective view of the present invention.

In the figure: 1. a fire extinguisher main body; 2. a C-shaped chute; 3. a C-shaped slide bar; 4. a roller; 5. a limiting rod; 6. a coil spring; 7. a lifting mechanism; 71. a telescopic rod; 72. a reset spring; 73. a cam; 74. a round bar; 8. an adjustment mechanism; 801. a sleeve; 802. a groove; 803. a circular tube; 804. inserting a rod; 805. a ring groove; 806. a rectangular through groove; 807. a touch plate; 808. a connecting rod; 809. a slide plate; 810. a coil spring; 811. a wedge block; 812. a first hinge plate; 813. a first stationary tube; 9. a fine adjustment mechanism; 901. rotating the tube; 902. a chute; 903. an L-shaped touch bar; 904. a second stationary tube; 905. a T-shaped hinge plate; 906. a pentagonal panel; 907. a limiting groove; 908. a crescent plate; 909 bumps; 910. a barrier tube; 911. a delivery pipe; 912. a torsion spring; 10. and (5) pressing the handle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a fire extinguisher for a chemical laboratory comprises a fire extinguisher main body 1, a C-shaped chute 2 is formed in the side surface of the fire extinguisher main body 1, a C-shaped sliding rod 3 is slidably connected to the inner side of the C-shaped chute 2, a coil spring 6 is fixedly connected to the top surface of a transverse plate of the C-shaped sliding rod 3, one end, away from the C-shaped sliding rod 3, of the coil spring 6 is fixedly connected to the inner wall of the C-shaped chute 2, rollers 4 are arranged at both ends of the C-shaped sliding rod 3, a lifting mechanism 7 is hinged to the side surface of the fire extinguisher main body 1, a limiting rod 5 is fixedly connected to the side surface of the fire extinguisher main body 1, and an adjusting mechanism 8 is fixedly sleeved at one end of a conveying pipe of the fire extinguisher main body 1.

According to the fire extinguisher, the lifting mechanism 7 comprises two telescopic rods 71, one end of each telescopic rod 71 is rotatably connected with the side face of the fire extinguisher main body 1, a reset spring 72 is movably sleeved on the side face of each telescopic rod 71, one end of each reset spring 72 is fixedly connected with the bottom of the side face of each telescopic rod 71, the other end of each reset spring 72 is fixedly connected with the top of the side face of each telescopic rod 71, a cam 73 is fixedly connected with the side face of the bottom end of each telescopic rod 71, the side face of each cam 73 is abutted against the top of the transverse plate of the C-shaped sliding rod 3, a round rod 74 is fixedly connected with one opposite side of each telescopic rod 71, the telescopic rods 71 are driven by the lifting round rods 74 to drive the cams 73 to deflect, the C-shaped sliding rods 3 are driven by the rollers 4 to move downwards, and a user can conveniently move the fire extinguisher.

In the invention, an adjusting mechanism 8 comprises a sleeve 801, the inner side of the sleeve 801 is fixedly sleeved with one end of a delivery pipe of a fire extinguisher main body 1, the side surface of the sleeve 801 is provided with two grooves 802, the side surface of the sleeve 801 is movably sleeved with a round pipe 803, the side surface of the round pipe 803 is movably inserted with an inserted rod 804, the side surface of the inserted rod 804 is movably connected with the side surface of the round pipe 803 through a spring, one end of the inserted rod 804 extends to the inner side of the round pipe 803 and is abutted against the inner wall of the upper groove 802, the side surface of the round pipe 803 is provided with a rectangular through groove 806, the inner side of the rectangular through groove 806 is rotatably connected with an abutting plate 807, the side surface of the abutting plate 807 is movably connected with the inner wall of the rectangular through groove 806 through a first torsion spring, the left side of the abutting plate 807 is abutted against the inner wall of the lower groove 802, the inner wall of the rectangular through groove 806 is slidably connected with a sliding plate 809, the left side of the sliding plate 809 is movably connected with the left side of the inner wall of the rectangular through a spiral spring 810, the top surface of a sliding plate 809 is fixedly connected with a wedge block 811, the side surface of the wedge block 811 abuts against the right end of an abutting plate 807, the right end of the sliding plate 809 is hinged to a first hinged plate 812, one end, far away from the sliding plate 809, of the first hinged plate 812 is hinged to the side surface of a circular tube 803, a first fixing tube 813 is fixedly sleeved on the side surface of the circular tube 803, a circular groove 805 is formed in the right end of the side surface of the circular tube 803, a fine adjustment mechanism 9 is movably sleeved on the right end of the side surface of the circular groove 805, the sliding plate 809 is urged to move leftwards by pressing the first hinged plate 812, the wedge block 811 is driven by the sliding plate 809 to move leftwards so as to urge the left side of the abutting plate 807 to tilt, the circular tube 803 is pulled so as to extend the length formed by the sleeve 801 and the circular tube 803, and when a fire is extinguished by the device, the length of a device conveying tube can be adjusted according to the arm length of a user.

In the invention, the fine adjustment mechanism 9 comprises a rotating pipe 901, the inner side of the rotating pipe 901 is movably sleeved with the side surface of the annular groove 805, the left end of the rotating pipe 901 is fixedly connected with a torsion spring 912, the torsion spring 912 is movably sleeved on the side surface of the annular groove 805, the left end of the torsion spring 912 is fixedly connected with the side surface of the annular groove 805, the side surface of the rotating pipe 901 is provided with an inclined groove 902, the inner wall of the inclined groove 902 is connected with an L-shaped touch bar 903 in a sliding manner, the left end of the L-shaped touch bar 903 is fixedly connected with a second fixed pipe 904, the second fixed pipe 904 is movably sleeved on the side surface of the circular pipe 803, the left end of the circular pipe 803 is hinged with a T-shaped hinge plate 905, the side surface of the T-shaped hinge plate 905 is movably connected with the side surface of the circular pipe 803 through a compression spring, one end of the T-shaped hinge plate 905 is hinged with the side surface of the circular pipe 803, the right end of the rotating pipe 901 is fixedly connected with a five-sided plate 906, the side surface of the five-sided plate 906 is provided with a limiting groove 907, the inner wall of the limiting groove 907 is connected with a bump 909 in a sliding manner, the right side of the bump 909 is fixedly connected with a crescent 908, the right side of the crescent 908 is rotatably connected with a blocking pipe 910, the inner side of the blocking pipe 910 is fixedly connected with one end of the connecting rod 808, the right side of the blocking pipe 910 is fixedly connected with a conveying pipe 911, the T-shaped hinged plate 905 is folded by holding the pressing handle 10, the second fixing pipe 904 is driven to move right, the L-shaped abutting rod 903 is driven to move right through the second fixing pipe 904, the rotating pipe 901 is driven to rotate anticlockwise to drive the pentagonal plate 906 to rotate anticlockwise, the bump 909 is driven to slide in the limiting groove 907 to drive the crescent 908 to rotate anticlockwise, and the quantity of fire extinguishing raw materials conveyed by the conveying pipe 911 in the gas conveying process of the device is regulated.

In the invention, the limiting rod 5 is C-shaped, and the limiting rod 5 is arranged outside the telescopic rod 71, so that a user can conveniently lift and carry the device.

In the present invention, the blocking tube 910 is in the shape of a truncated cone, which reduces the possibility of heat in the air being transferred to the user's hand.

In the invention, the number of the inclined slots 902 is three, the three inclined slots 902 are distributed annularly at equal intervals, and the three L-shaped contact rods 903 are abutted against the inclined slots 902 to ensure that the rotating pipe 901 rotates stably.

In the invention, one end of the T-shaped hinged plate 905 is hinged with a pressing handle 10, the side surface of the pressing handle 10 is respectively connected with one side of the first fixing pipe 813 opposite to one side of the second fixing pipe 904 in a sliding way, a user can conveniently hold the round pipe 803 by the pressing handle 10, and the folding angle of the T-shaped hinged plate 905 is controlled by pressing the pressing handle 10 downwards, so that the speed of delivering fire extinguishing fuel by the device is controlled.

When in use, the telescopic rod 71 is promoted to drive the cam 73 to deflect by lifting the round rod 74 upwards, the C-shaped sliding rod 3 is promoted to drive the roller 4 to move downwards, the device is moved to a designated position, then, holding the barrel 803, and then pressing the first hinge plate 812 causes the sled 809 to move to the left, the slide 809 drives the wedge block 811 to move left to make the left side of the touch plate 807 tilt, the round tube 803 is pulled to facilitate the extension of the length formed by the sleeve 801 and the round tube 803, the extinguisher body 1 is then opened, the T-shaped hinged plate 905 is caused to fold by holding the press handle 10, and the second fixing tube 904 is caused to move right, the L-shaped abutting rod 903 is driven by the second fixed pipe 904 to move rightwards, the rotating pipe 901 is driven to rotate anticlockwise to drive the pentagonal plate 906 to rotate anticlockwise, and further the bump 909 slides in the limit groove 907 to drive the crescent plate 908 to rotate anticlockwise, so as to regulate and control the amount of fire extinguishing raw materials conveyed by the conveying pipe 911 in the gas conveying process of the device.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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

Claims

1. A fire extinguisher for chemical laboratories, comprising a extinguisher body (1), characterized in that: the fire extinguisher comprises a fire extinguisher main body (1), wherein a C-shaped sliding chute (2) is formed in the side surface of the fire extinguisher main body (1), a C-shaped sliding rod (3) is connected to the inner side of the C-shaped sliding chute (2) in a sliding manner, a spiral spring (6) is fixedly connected to the top surface of a transverse plate of the C-shaped sliding rod (3), one end, away from the C-shaped sliding rod (3), of the spiral spring (6) is fixedly connected with the inner wall of the C-shaped sliding chute (2), idler wheels (4) are arranged at two ends of the C-shaped sliding rod (3), a lifting mechanism (7) is hinged to the side surface of the fire extinguisher main body (1), a limiting rod (5) is fixedly connected to the side surface of the fire extinguisher main body (1), and an adjusting mechanism (8) is fixedly sleeved at one end of a conveying pipe of the fire extinguisher main body (1);

the lifting mechanism (7) comprises two telescopic rods (71), one end of each telescopic rod (71) is rotatably connected with the side face of the fire extinguisher main body (1), a reset spring (72) is movably sleeved on the side face of each telescopic rod (71), one end of each reset spring (72) is fixedly connected with the bottom of the side face of each telescopic rod (71), the other end of each reset spring (72) is fixedly connected with the top of the side face of each telescopic rod (71), a cam (73) is fixedly connected with the side face of the bottom end of each telescopic rod (71), the side face of each cam (73) is abutted against the top of a transverse plate of the C-shaped sliding rod (3), and a round rod (74) is fixedly connected to one side of each telescopic rod (71) opposite to each other;

the adjusting mechanism (8) comprises a sleeve (801), the inner side of the sleeve (801) is fixedly sleeved with one end of a conveying pipe of the fire extinguisher main body (1), two grooves (802) are formed in the side surface of the sleeve (801), a round pipe (803) is movably sleeved on the side surface of the sleeve (801), an inserted rod (804) is movably inserted into the side surface of the round pipe (803) in a plugging manner, the side surface of the inserted rod (804) is movably connected with the side surface of the round pipe (803) through a spring, one end of the inserted rod (804) extends to the inner side of the round pipe (803) and is abutted against the inner wall of the upper side groove (802), a rectangular through groove (806) is formed in the side surface of the round pipe (803), an abutting plate (807) is rotatably connected to the inner side surface of the rectangular through groove (806), the side surface of the abutting plate (807) is movably connected with the inner wall of the rectangular through groove (806) through a first torsion spring, the left side of the abutting plate (807) is abutted against the inner wall of the lower side groove (802), the inner wall of the rectangular through groove (806) is connected with a sliding plate (809) in a sliding manner, the left side of the sliding plate (809) is movably connected with the left side of the inner wall of the rectangular through groove (806) through a spiral spring (810), the top surface of the sliding plate (809) is fixedly connected with a wedge-shaped block (811), the side surface of the wedge-shaped block (811) is abutted against the right end of the abutting plate (807), the right end of the sliding plate (809) is hinged to a first hinged plate (812), one end, far away from the sliding plate (809), of the first hinged plate (812) is hinged to the side surface of a round pipe (803), the side surface of the round pipe (803) is fixedly sleeved with a first fixing pipe (813), the side surface of the first fixing pipe (813) is fixedly connected with a connecting rod (808), the right end of the side surface of the round pipe (803) is provided with a ring groove (805), the right end, on the side surface of the ring groove (805) is movably sleeved with a fine adjustment mechanism (9), and the sliding plate (809) is pressed to enable the sliding plate (809) to move leftwards, the sliding plate (809) drives the wedge-shaped block (811) to move left to enable the left side of the touch plate (807) to tilt up, and the circular tube (803) is pulled to facilitate the extension of the length formed by the sleeve (801) and the circular tube (803);

the fine adjustment mechanism (9) comprises a rotating pipe (901), the inner side of the rotating pipe (901) is movably sleeved with the side face of the annular groove (805), the left end of the rotating pipe (901) is fixedly connected with a torsion spring (912), the torsion spring (912) is movably sleeved on the side face of the annular groove (805), the left end of the torsion spring (912) is fixedly connected with the side face of the annular groove (805), the side face of the rotating pipe (901) is provided with an inclined groove (902), the inner wall of the inclined groove (902) is connected with an L-shaped touch bar (903) in a sliding manner, the left end of the L-shaped touch bar (903) is fixedly connected with a second fixing pipe (904), the second fixing pipe (904) is movably sleeved on the side face of the circular pipe (803), the left end of the circular pipe (803) is hinged with a T-shaped hinge plate (905), the side face of the T-shaped hinge plate (905) is movably connected with the side face of the circular pipe (803) through a compression spring, one end of the T-shaped hinged plate (905) is hinged with the side face of the round pipe (803), the right end of the rotating pipe (901) is fixedly connected with a pentagonal plate (906), the side face of the pentagonal plate (906) is provided with a limiting groove (907), the inner wall of the limiting groove (907) is connected with a convex block (909) in a sliding manner, the right side of the convex block (909) is fixedly connected with a crescent plate (908), the right side of the crescent plate (908) is rotatably connected with a blocking pipe (910), the inner side of the blocking pipe (910) is fixedly connected with one end of a connecting rod (808), the right side of the blocking pipe (910) is fixedly connected with a conveying pipe (911), one end of the T-shaped hinged plate (905) is hinged with a pressing handle (10), the T-shaped hinged plate (905) is enabled to be folded by holding the pressing handle (10), the second fixing pipe (904) is enabled to move to the right, and the L-shaped touch rod (903) is driven to move to the right by the second fixing pipe (904), the rotating pipe (901) is enabled to rotate anticlockwise to drive the pentagonal plate (906) to rotate anticlockwise, so that the lug (909) is enabled to slide in the limiting groove (907) to enable the crescent plate (908) to rotate anticlockwise, and the quantity of fire extinguishing raw materials conveyed by the conveying pipe (911) in the gas conveying process of the device is adjusted and controlled.

2. A fire extinguisher for a chemical laboratory according to claim 1, wherein: the limiting rod (5) is C-shaped, and the limiting rod (5) is arranged on the outer side of the telescopic rod (71).

3. A fire extinguisher for a chemical laboratory according to claim 1, wherein: the blocking pipe (910) is in a shape of a truncated cone.

4. A fire extinguisher for a chemical laboratory according to claim 1, wherein: the number of the inclined grooves (902) is three, and the three inclined grooves (902) are distributed annularly at equal intervals.

5. A fire extinguisher for a chemical laboratory according to claim 1, wherein: the side surfaces of the pressing handle (10) are respectively connected with one sides of the first fixing pipe (813) and the second fixing pipe (904) in a sliding mode.