Splash-proof mixing device for pesticide missible oil preparation

Abstract

The utility model relates to the technical field of pesticide mixing, in particular to a pesticide missible oil preparation splash-proof mixing device which can prevent poisonous gas from overflowing to injure workers and improve safety when water and missible oil preparations are added. Comprising a chassis and a mixing tank, the lower portion of the fixed barrel extends into the upper portion of the mixing cavity of the mixing tank, an insertion opening is formed in the upper portion of the fixed barrel, the first partition plate is installed on the lower portion of the fixed barrel, a plurality of first holes are formed in the first partition plate, the lower portion of the movable barrel is inserted into the fixed barrel through the insertion opening, and the second partition plate is installed at the lower end of the movable barrel. The upper portion of the movable barrel extends out of the inserting opening of the fixed barrel, a medicine adding opening is formed in the upper end of the movable barrel, the end cover is detachably installed on the medicine adding opening in the upper end of the movable barrel in a sealed mode, a water adding pipe is installed on the end cover, and a valve is arranged on the water adding pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pesticide mixing, in particular to a pesticide emulsifiable concentrate preparation splash-proof mixing device. BACKGROUND

[0002] Emulsifiable concentrate preparation is a kind of pesticide preparation, which is a liquid formed by dissolving high-concentration active ingredients in solvent and adding emulsifiers. It is generally diluted into stable emulsion with a large amount of water and then spread with a sprayer.

[0003] The prior art disclosed in Chinese utility model patent CN216063021U proposes a pesticide emulsifiable concentrate preparation splash-proof mixing device. The device sets the discharge end of the emulsifiable concentrate pipe underwater, so that the emulsifiable concentrate entering the inside of the medicament mixing cavity will not immediately float on the water surface, which is beneficial to improve the stirring and mixing effect. By pushing the piston rod downward, the fixed rod moves in water, and the stirring blade continuously rotates under the action of water flow, thereby preliminarily mixing the pesticide emulsifiable concentrate and water inside the emulsifiable concentrate pipe. Finally, the piston extrudes all the preliminarily mixed pesticide emulsifiable concentrate and water inside the emulsifiable concentrate pipe, and then the stirring assembly in the medicament mixing cavity continues to stir and mix, thereby improving the mixing effect.

[0004] However, the above-mentioned mixing device needs to open the end cover to add water and emulsifiable concentrate into the mixing tank and emulsifiable concentrate pipe during work. At this time, the inside of the mixing tank and emulsifiable concentrate pipe is exposed to the outside air, causing the toxic gas remaining in the mixing tank to overflow. These overflowing toxic gases can harm the workers adding emulsifiable concentrate into the emulsifiable concentrate pipe, and the safety is low. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a pesticide emulsifiable concentrate preparation splash-proof mixing device that can avoid the overflow of toxic gas to harm workers and improve safety when adding water and emulsifiable concentrate.

[0006] The utility model discloses a pesticide emulsifiable concentrate preparation splashproof mixing device, including the bottom disc and the mixing jar, the mixing jar is installed on the bottom disc, and the inside of mixing jar is provided with mixing chamber, still including fixed bucket, baffle no.

[0007] Preferably, it further comprises an axial flow pipe, a motor, a shaft and an impeller, the axial flow pipe is installed in the mixing chamber of the mixing jar, the upper end of the axial flow pipe is communicated with the middle part of the fixed bucket, a plurality of water inlet holes are arranged on the sidewall of the middle part of the movable bucket, the water inlet holes are aligned with the upper end of the axial flow pipe, the lower end of the axial flow pipe extends into the bottom of the mixing chamber of the mixing jar, the motor is installed on the bottom disc, the output of the motor is drivingly connected with the upper end of the shaft, the shaft is rotatably installed in the axial flow pipe, the lower end of the shaft is concentrically installed with the impeller, and the impeller is located in the lower end of the axial flow pipe; after the emulsifiable concentrate is added into the movable bucket, the plurality of holes two of the baffle two are aligned with the plurality of holes one of the baffle one, the motor is started to drive the shaft and the impeller to rotate, the water at the bottom of the mixing chamber of the mixing jar is pushed upwards along the axial flow pipe by the rotation of the impeller, the water is input into the inside of the movable bucket from the bottom of the mixing chamber of the mixing jar through the axial flow pipe to flush the residual emulsifiable concentrate, the water is backflowed into the mixing chamber of the mixing jar through the lower part of the fixed bucket after flushing, the circulation of the water is realized, the emulsifiable concentrate is fully mixed with the water, and the utility is good.

[0008] Preferably, the expansion pipe is installed at the lower end of the axial flow pipe, the impeller is located in the expansion pipe, and the inner diameter of the expansion pipe is larger than that of the axial flow pipe; the impeller rotates in the expansion pipe to deliver water into the axial flow pipe, and the water is inwardly contracted during the delivery from the expansion pipe to the axial flow pipe, thereby increasing the flow rate of the water, the impact force of the water, and the mixing efficiency of the emulsion preparation and the water.

[0009] Preferably, the speed reducer, the drive shaft and the stirring plates are further included, the speed reducer is installed at the bottom of the mixing chamber of the mixing tank, the input shaft of the speed reducer is in transmission connection with the lower end of the shaft rod, and the output end of the drive shaft is installed with a plurality of stirring plates; the shaft rod drives the impeller to rotate at a high speed when rotating at a high speed, the expansion pipe drives the drive shaft to rotate, the speed reducer reduces the power input by the drive shaft and increases the torque to drive the output end to rotate, and the plurality of stirring plates are driven to rotate to stir the emulsion preparation and the water in the mixing chamber of the mixing tank, thereby improving the mixing efficiency.

[0010] Preferably, the transparent liquid level window and the liquid discharge pipe are further included, the transparent liquid level window is installed on the side wall of the mixing tank, the liquid discharge pipe is installed at the bottom of the mixing tank, a valve is arranged on the liquid discharge pipe, and the liquid discharge pipe is in communication with the mixing chamber of the mixing tank; the liquid level in the mixing chamber of the mixing tank and the mixing degree of the emulsion preparation and the water can be known through the transparent liquid level window, and the mixed liquid in the mixing chamber of the mixing tank can be discharged through the liquid discharge pipe, thereby being good in practicability.

[0011] Preferably, the chassis includes the main body, the two front wheels and the two rear wheels, the main body is installed at the bottom of the mixing tank, the main body is provided with the power supply unit, the two front wheels are rotatably installed at the left and right sides of the front portion of the main body, the two rear wheels are rotatably installed at the left and right sides of the rear portion of the main body, and the main body is in electrical connection with the two rear wheels; the two front wheels and the two rear wheels roll to support the main body and the mixing tank, the power supply unit of the main body supplies power to the two rear wheels, so that the two rear wheels can rotate to drive the main body and the mixing tank to move, thereby being good in maturity and practicability.

[0012] Preferably, the two swing arms and the two shock absorbers are further included, the inner ends of the two swing arms are respectively in rotational connection with the left and right sides of the rear portion of the main body, the two rear wheels are respectively installed on the outer ends of the two swing arms, the upper ends of the two shock absorbers are in rotational connection with the rear portion of the main body, and the lower ends of the two shock absorbers are respectively in rotational connection with the outer ends of the two swing arms; the two rear wheels are respectively installed on the rear portion of the main body through the two swing arms, and the two shock absorbers elastically support the two swing arms, thereby adapting to poor road conditions, improving the passability and the stability of the mixing tank.

[0013] Compared with the prior art, the utility model has the advantages that when water and emulsion preparation are added, the toxic gas in the mixing chamber of the chassis is sealed and isolated, the toxic gas is prevented from overflowing to cause harm to the workers, and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1It is the front section structure schematic view of the utility model;

[0015] Fig. 2 It is the local section structure schematic view of the utility model;

[0016] Fig. 3 It is the isometric structure schematic view of the utility model;

[0017] Fig. 4 It is the structure schematic view of fixed barrel, movable barrel, end cover, axial flow pipe, motor, impeller, expansion pipe, speed reducer and stirring plate structure etc.;

[0018] Fig. 5 It is the structure schematic view of fixed barrel, baffle one, movable barrel, baffle two and end cover structure etc. in the exploded state;

[0019] Fig. 6 It is the structure schematic view of motor, shaft rod, impeller, speed reducer, drive shaft and stirring plate structure etc.

[0020] Markings in the drawing: 1, bottom disc;2, mixing tank;3, fixed barrel;4, baffle one;5, movable barrel;6, baffle two;7, end cover;8, water pipe;9, axial flow pipe;10, motor;11, shaft rod;12, impeller;13, expansion pipe;14, speed reducer;15, drive shaft;16, stirring plate;17, transparent liquid level window;18, liquid discharge pipe;19, main body;20, front wheel;21, rear wheel;22, swing arm;23, shock absorber. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the utility model, the utility model will be described more comprehensively below with reference to relevant drawings. The utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0022] Embodiment 1

[0023] As Figs. 1 to 3As shown, the device comprises a base 1 and a mixing tank 2, the mixing tank 2 is installed on the base 1, and the inside of the mixing tank 2 is provided with a mixing chamber; further comprising a fixed barrel 3, a partition one 4, a movable barrel 5, a partition two 6, an end cover 7 and a water adding pipe 8, the lower part of the fixed barrel 3 extends into the upper part of the mixing chamber of the mixing tank 2, the upper part of the fixed barrel 3 is provided with a socket, the lower part of the fixed barrel 3 is installed with the partition one 4, and the partition one 4 is provided with a plurality of holes one, the lower part of the movable barrel 5 is inserted into the inside of the fixed barrel 3 through the socket, the lower end of the movable barrel 5 is installed with the partition two 6, the partition two 6 is provided with a plurality of holes two, the plurality of holes two are respectively aligned with the plurality of holes one, the upper part of the movable barrel 5 extends out of the socket of the fixed barrel 3, the upper end of the movable barrel 5 is provided with a medicine adding port, the end cover 7 is detachably sealed and installed on the medicine adding port of the upper end of the movable barrel 5, the end cover 7 is installed with the water adding pipe 8, and the water adding pipe 8 is provided with a valve; further comprising a transparent liquid level window 17 and a liquid discharge pipe 18, the transparent liquid level window 17 is installed on the side wall of the mixing tank 2, and the liquid discharge pipe 18 is installed on the bottom of the mixing tank 2, the liquid discharge pipe 18 is provided with a valve, and the liquid discharge pipe 18 communicates with the mixing chamber of the mixing tank 2.

[0024] In operation, the movable barrel 5 is rotated to align the plurality of holes two of the partition two 6 with the plurality of holes one of the partition one 4 respectively, the end cover 7 is sealed and installed on the medicine adding port of the movable barrel 5, and the water adding pipe 8 is connected with an external water supply system, so as to add water into the movable barrel 5 through the water adding pipe 8, so that the water enters the lower part of the fixed barrel 3 through the plurality of holes two of the partition two 6 and the plurality of holes one of the partition one 4, and then is added into the mixing chamber of the mixing tank 2, after the water adding is completed, the movable barrel 5 is rotated to stagger the plurality of holes two of the partition two 6 with the plurality of holes one of the partition one 4, so as to separate the movable barrel 5 from the mixing chamber of the mixing tank 2, the end cover 7 is opened, the emulsion preparation is added into the movable barrel 5, the end cover 7 is closed, the movable barrel 5 is rotated to align the plurality of holes two of the partition two 6 with the plurality of holes one of the partition one 4 again, so as to add the emulsion preparation into the water in the mixing chamber, the emulsion preparation and the water are stirred and mixed, the liquid level in the mixing chamber of the mixing tank 2 and the mixing degree of the emulsion preparation and the water are understood through the transparent liquid level window 17, and the mixed liquid in the mixing chamber of the mixing tank 2 is discharged through the liquid discharge pipe 18, compared with the prior art, the toxic gas in the mixing chamber of the base 1 is sealed and isolated when the water and the emulsion preparation are added, so as to avoid the toxic gas overflow to cause harm to the workers and improve the safety.

[0025] Example 2

[0026] As Figs. 4 to 6As shown, based on the embodiment 1, further comprising a shaft pipe 9, a motor 10, a shaft rod 11 and an impeller 12, the shaft pipe 9 is installed in the mixing chamber of the mixing tank 2, the upper end of the shaft pipe 9 is communicated with the middle part of the fixed barrel 3, a plurality of water inlet holes are arranged on the middle part of the side wall of the movable barrel 5, the water inlet holes are aligned with the upper end of the shaft pipe 9, the lower end of the shaft pipe 9 extends into the bottom of the mixing chamber of the mixing tank 2, the motor 10 is installed on the bottom plate 1, the output of the motor 10 is in transmission connection with the upper end of the shaft rod 11, the shaft rod 11 is rotatably installed in the inside of the shaft pipe 9, the lower end of the shaft rod 11 is concentrically installed with the impeller 12, and the impeller 12 is located in the inside of the lower end of the shaft pipe 9; further comprising an expansion pipe 13, the expansion pipe 13 is installed at the lower end of the shaft pipe 9, the impeller 12 is located in the expansion pipe 13, and the inner diameter of the expansion pipe 13 is larger than the inner diameter of the shaft pipe 9; further comprising a speed reducer 14, a driving shaft 15 and a stirring plate 16, the speed reducer 14 is installed at the bottom of the mixing chamber of the mixing tank 2, the input shaft of the speed reducer 14 is in transmission connection with the lower end of the shaft rod 11, and the output end of the driving shaft 15 is installed with a plurality of stirring plates 16.

[0027] After the emulsion preparation is added into the movable barrel 5, the movable barrel 5 is rotated to align the plurality of holes two of the second partition plate 6 with the plurality of holes one of the first partition plate 4 respectively, the motor 10 is started to drive the shaft rod 11 and the impeller 12 to rotate, the impeller 12 rotates to push the water at the bottom of the mixing chamber of the mixing tank 2 upward along the shaft pipe 9, the impeller 12 rotates to transport the water into the shaft pipe 9 in the expansion pipe 13, since the water is inwardly contracted in the process of being transported from the expansion pipe 13 to the shaft pipe 9, the flow rate of the water is improved, the impact force of the water is improved, the water from the bottom of the mixing chamber of the mixing tank 2 is input into the inside of the movable barrel 5 through the shaft pipe 9 to flush the residual emulsion preparation, after the flushing, the water flows back to the mixing chamber of the mixing tank 2 through the lower part of the fixed barrel 3 to realize the circulation flow of the water, when the shaft rod 11 rotates at high speed, the impeller 12 rotates at high speed driven by the shaft rod 11, at the same time, the expansion pipe 13 drives the driving shaft 15 to rotate, the speed reducer 14 reduces the power input by the driving shaft 15 to increase the torque of the output end, and the plurality of stirring plates 16 are driven to rotate by the output end, so that the plurality of stirring plates 16 stir the emulsion preparation and the water in the mixing chamber of the mixing tank 2 to improve the mixing efficiency.

[0028] Embodiment 3

[0029] As Figs. 1 to 3As shown, on the basis of embodiment 1, the chassis 1 comprises a main body 19, two front wheels 20 and two rear wheels 21, the main body 19 is installed at the bottom of the mixing tank 2, the main body 19 is provided with a power supply unit, the two front wheels 20 are rotatably installed at the left and right sides of the front part of the main body 19, the two rear wheels 21 are rotatably installed at the left and right sides of the rear part of the main body 19, and the main body 19 is electrically connected with the two rear wheels 21; further comprising two swing arms 22 and two shock absorbers 23, the inner ends of the two swing arms 22 are respectively rotatably connected with the left and right sides of the rear part of the main body 19, the two rear wheels 21 are respectively installed on the outer ends of the two swing arms 22, the upper ends of the two shock absorbers 23 are rotatably connected with the rear part of the main body 19, and the lower ends of the two shock absorbers 23 are respectively rotatably connected with the outer ends of the two swing arms 22.

[0030] The two front wheels 20 and the two rear wheels 21 rollably support the main body 19 and the mixing tank 2, the power supply unit of the main body 19 supplies power to the two rear wheels 21, so that the two rear wheels 21 can rotate, thereby driving the main body 19 and the mixing tank 2 to move, the two rear wheels 21 are respectively installed on the rear part of the main body 19 through the two swing arms 22, and the two shock absorbers 23 elastically support the two swing arms 22, thereby adapting to poor road conditions, improving the passability and stability of the mixing tank 2.

[0031] As Figs. 1 to 6As shown, the pesticide emulsifiable concentrate preparation splash-proof mixing device, in working, first rotates the movable barrel 5, makes the multiple holes two of the baffle two 6 and the multiple holes one of the baffle one 4 respectively align, the end cover 7 is sealed and installed on the dosing opening of the movable barrel 5, the water adding pipe 8 is connected with the external water supply system, so as to add water to the movable barrel 5 through the water adding pipe 8, so that the water enters the lower part of the fixed barrel 3 through the multiple holes two of the baffle two 6 and the multiple holes one of the baffle one 4 and is added to the mixing chamber of the mixing tank 2, after water adding is completed, rotates the movable barrel 5 to make the multiple holes two of the baffle two 6 and the multiple holes one of the baffle one 4 stagger, so as to isolate the mixing chamber of the mixing tank 2 from the movable barrel 5, open the end cover 7, add the emulsifiable concentrate preparation to the movable barrel 5, close the end cover 7, then rotate the movable barrel 5, so that the multiple holes two of the baffle two 6 and the multiple holes one of the baffle one 4 are aligned again, so that the emulsifiable concentrate preparation is added to the water in the mixing chamber, the motor 10 is opened to drive the shaft rod 11 and the impeller 12 to rotate, the impeller 12 rotates to push the water at the bottom of the mixing chamber of the mixing tank 2 upward along the axial flow pipe 9, so that the water is input to the inside of the movable barrel 5 from the bottom of the mixing chamber of the mixing tank 2 through the axial flow pipe 9 to flush the residual emulsifiable concentrate preparation, after flushing, the water is returned to the mixing chamber of the mixing tank 2 through the lower part of the fixed barrel 3, realizing the circulation of the water, when the shaft rod 11 rotates at high speed, the impeller 12 rotates at high speed, and the expansion pipe 13 drives the driving shaft 15 to rotate, the speed reducer 14 reduces the power input by the driving shaft 15 to increase the torque, so that the output end drives the multiple stirring plates 16 to rotate, so that the multiple stirring plates 16 stir the emulsifiable concentrate preparation and water in the mixing chamber of the mixing tank 2, then the liquid level in the mixing chamber of the mixing tank 2 and the mixing degree of the emulsifiable concentrate preparation and water are understood through the transparent liquid level window 17, and the mixed liquid in the mixing chamber of the mixing tank 2 can be discharged through the liquid discharge pipe 18.

[0032] The main functions realized by the utility model are:

[0033] 1. When adding water and emulsifiable concentrate, toxic gas overflow can be avoided to cause harm to workers, and safety is improved;

[0034] 2. Poor road conditions can be adapted to improve passability and stability of the mixing tank 2;

[0035] 3. The circulation of water is combined with the multiple stirring plates 16 to stir the emulsifiable concentrate and water in the mixing chamber of the mixing tank 2, and the mixing efficiency is improved.

[0036] The installation mode, connection mode or setting mode of the pesticide emulsifiable concentrate preparation splash-proof mixing device are common mechanical modes, and any mode that can achieve the beneficial effects can be implemented; the chassis 1, the mixing tank 2, the end cover 7, the water adding pipe 8, the axial flow pipe 9, the motor 10, the shaft 11, the impeller 12, the speed reducer 14, the transparent liquid level window 17, the main body 19, the front wheel 20, the rear wheel 21, the swing arm 22 and the shock absorber 23 of the pesticide emulsifiable concentrate preparation splash-proof mixing device are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, and the technical personnel in the field do not need to pay creative labor.

[0037] All the technical and scientific terms used herein have the same meanings as those commonly understood by the technical personnel belonging to the technical field of the utility model. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments, and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for the ordinary technical personnel in the technical field, several improvements and modifications can be made without departing from the technical principles of the utility model, and these improvements and modifications should be regarded as the protection scope of the utility model.

Claims

1. A pesticide emulsifiable concentrate preparation splash-proof mixing device, comprising a base plate (1) and a mixing tank (2), the mixing tank (2) being installed on the base plate (1), and a mixing chamber being arranged inside the mixing tank (2); characterized in that, It also includes fixed barrel (3), partition one (4), movable barrel (5), partition two (6), end cover (7) and water pipe (8), the lower part of fixed barrel (3) extends into the mixing chamber upper part of mixing tank (2), the upper part of fixed barrel (3) is provided with socket, the lower part of fixed barrel (3) is installed partition one (4), partition one (4) is provided with a plurality of holes one, the lower part of movable barrel (5) is inserted into the inside of fixed barrel (3) through socket, the lower end of movable barrel (5) is installed partition two (6), partition two (6) is provided with a plurality of holes two, a plurality of holes two are respectively aligned with a plurality of holes one, the upper part of movable barrel (5) extends out of the socket of fixed barrel (3), the upper end of movable barrel (5) is provided with dosing port, end cover (7) is detachably sealed and installed on the upper end dosing port of movable barrel (5), end cover (7) is installed water pipe (8), water pipe (8) is provided with valve.

2. The splash-proof mixing device for pesticide emulsifiable concentrate formulation according to claim 1, characterized in that, It also includes axial flow pipe (9), motor (10), shaft (11) and impeller (12), axial flow pipe (9) is installed in the mixing chamber of mixing tank (2), the upper end of axial flow pipe (9) is communicated with the middle part of fixed barrel (3), a plurality of water inlet holes are provided on the side wall of the middle part of movable barrel (5), the water inlet holes are aligned with the upper end of axial flow pipe (9), the lower end of axial flow pipe (9) extends into the bottom of the mixing chamber of mixing tank (2), motor (10) is installed on the bottom disc (1), the output of motor (10) is drivingly connected with the upper end of shaft (11), shaft (11) is rotatably installed in the inside of axial flow pipe (9), impeller (12) is concentrically installed at the lower end of shaft (11), impeller (12) is located in the inside of the lower end of axial flow pipe (9).

3. The splash-proof mixing device for pesticide emulsifiable concentrate formulation according to claim 2, characterized in that, It also includes expansion pipe (13), expansion pipe (13) is installed at the lower end of axial flow pipe (9), impeller (12) is located in expansion pipe (13), the inner diameter of expansion pipe (13) is greater than the inner diameter of axial flow pipe (9).

4. The splash-proof mixing device for emulsifiable concentrate of a pesticide according to claim 2, wherein It also includes speed reducer (14), drive shaft (15) and stirring plate (16), speed reducer (14) is installed at the bottom of the mixing chamber of mixing tank (2), the input shaft of speed reducer (14) is drivingly connected with the lower end of shaft (11), the output end of drive shaft (15) is installed a plurality of stirring plates (16).

5. The splash-proof mixing device for emulsifiable concentrate of a pesticide according to claim 1, wherein It also includes transparent liquid level window (17) and drainage pipe (18), transparent liquid level window (17) is installed on the side wall of mixing tank (2), drainage pipe (18) is installed at the bottom of mixing tank (2), valve is provided on drainage pipe (18), drainage pipe (18) is communicated with the mixing chamber of mixing tank (2).

6. The splash-proof mixing device for emulsifiable concentrate of a pesticide according to claim 1, wherein The bottom disc (1) includes main body (19), two front wheels (20) and two rear wheels (21), the main body (19) is installed at the bottom of mixing tank (2), the main body (19) is provided with power supply unit, the two front wheels (20) are rotatably installed at the left and right sides of the front part of main body (19), the two rear wheels (21) are rotatably installed at the left and right sides of the rear part of main body (19), the main body (19) is electrically connected with the two rear wheels (21).

7. The anti-splashing mixing device for pesticide emulsifiable concentrate formulation according to claim 6, characterized in that, Two swing arms (22) and two shock absorbers (23) are further included, inner ends of the two swing arms (22) are respectively rotatably connected with left and right sides of the rear part of the main body (19), the two rear wheels (21) are respectively installed on outer ends of the two swing arms (22), upper ends of the two shock absorbers (23) are rotatably connected with the rear part of the main body (19), and lower ends of the two shock absorbers (23) are respectively rotatably connected with the outer ends of the two swing arms (22).

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