Down filling power tester

Abstract

A down filling power tester relates to the field of textile performance detection equipment, and comprises a cabinet body, an air injection mechanism, a down pressing mechanism, a conveying mechanism and a control system, and a pretreatment box or a sample cylinder is arranged in the cabinet body; the air injection mechanism is arranged on the air injection station and comprises a sealing cover arranged in a lifting manner, and a first air outlet hole and a second air outlet hole which are formed in the bottom of the sealing cover; the down pressing mechanism is arranged on the down pressing station and comprises a pressing disc and a telescopic assembly. The conveying mechanism is arranged on the bottom surface of the experimental space and drives the pretreatment box or the sample cylinder to do rotary motion between the air injection station and the down pressing station; the control system controls the telescopic assembly to work according to a signal fed back by the weighing sensor so as to release or retract the pressing disc. The device can perform pretreatment and down pressing operation at the same time, has multiple purposes, saves space and cost, accurately controls all the mechanisms to automatically work through the controller, enables the detection process to be automatic, and saves labor force.

Description

TECHNICAL FIELD

[0001] The utility model belongs to textile performance detection equipment field, concretely is a kind of down loft tester. BACKGROUND

[0002] Loft is important quality index in down feather and its product, and plays a decisive role in the warmth retention performance of down product. Therefore, the accuracy of loft measurement is crucial, which directly affects the rating of down and its product. At present, most of the standards related to down loft in China adopt steam reduction method in GB / T 14272-2021 "Down Garments".

[0003] Steam reduction method needs to wet, dry and stand for more than 48 hours in the pretreatment box, then pour the down after standing into the sample cylinder, scatter and put into the pressure disc to compress the down, so as to determine the loft of the down. In the prior art, there are devices for automatic or semi-automatic processing of two steps respectively, which can automatically operate the wetting and drying of down in the pretreatment box and the scattering and pressing of down in the sample cylinder, saving labor. However, due to the large time span between the two steps of pretreatment and pressing, the amount of detection for some small institutions is not large, and the purchase of two devices occupies a large space, and often the devices are idle, which needs to be improved. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the shortcomings of prior art, and provides an automatic detergent instrument.

[0005] The utility model adopts the following technical scheme:

[0006] A down loft tester, comprising a cabinet, a jet mechanism, a down pressing mechanism, a conveying mechanism and a control system, a constant temperature and humidity experimental space is arranged in the cabinet, a pretreatment box or a sample cylinder is arranged in the experimental space; the jet mechanism is arranged on the left side of the top surface of the experimental space, the position directly below the jet mechanism is a jet working position, and the jet mechanism comprises a seal cover arranged in a lifting mode and first and second air outlets arranged at the bottom of the seal cover and capable of spraying steam and air respectively; the down pressing mechanism is arranged on the right side of the top surface of the experimental space, the position directly below the down pressing mechanism is a down pressing working position, and the down pressing mechanism comprises a pressure disc capable of pressing down in the test cylinder and a telescopic assembly capable of driving the pressure disc to move up and down; the conveying mechanism is arranged on the bottom surface of the experimental space, and drives the pretreatment box or the sample cylinder to make rotary motion between the jet working position and the down pressing working position; the control system comprises a weighing sensor and a controller, the weighing sensor is arranged on the conveying mechanism and used to measure the weight of the sample cylinder; and the controller controls the telescopic assembly to release or retract the pressure disc according to the signal fed back by the weighing sensor.

[0007] Preferably, the conveying mechanism comprises a rotary arm, a rotary driving disc and a tray, the rotary arm extends from the midpoint between the centers of the air jet station and the felting station to both ends and is rotatably arranged at the midpoint, the rotary driving disc is connected with the rotary arm and drives the rotation of the rotary arm, and the tray is arranged at both ends of the rotary arm and can be opposite to the air jet station and the felting station respectively, the pre-treatment box or the sample cylinder is arranged on the tray and can rotate with the tray, and the weighing sensor is arranged on the tray and in contact with the pre-treatment box or the sample cylinder.

[0008] Preferably, the conveying mechanism further comprises guide rails and auxiliary wheels, the guide rails are arranged in two and concentrically arranged with the rotary arm, the tray is located between the two guide rails to guide the rotation of the tray, and the auxiliary wheels are arranged on the tray and can rollingly contact the two guide rails to assist the rotation of the tray.

[0009] Preferably, the pre-treatment box is a cuboid structure with a rectangular bottom surface, screens on four side surfaces and an open top surface, the sample cylinder is a cylindrical structure with a circular bottom surface, a transparent side surface and an open top surface, and the tray is formed with special-shaped mounting grooves for respectively placing and fixing the pre-treatment box or the sample cylinder.

[0010] Preferably, the size of the sealing cover is greater than the size of the top opening of the pre-treatment box and the sample cylinder, the diameter of the pressing disc is matched with the inner diameter of the sample cylinder, and a plurality of air permeable holes are formed in the pressing disc.

[0011] Preferably, the telescopic assembly comprises an electric screw rod, an electromagnet, a limit switch and a rotary encoder, the electric screw rod is arranged on the top surface of the experimental space, the electromagnet is arranged at the end of the electric screw rod, the pressing disc can be adsorbed below the electromagnet, the limit switch is arranged at the initial position of the pressing disc to sense the reset state of the pressing disc, and the rotary encoder is connected with the electric screw rod to determine the lifting height of the pressing disc.

[0012] Preferably, the air jet mechanism further comprises a lifting assembly for driving the sealing cover to move up and down, one end of the lifting assembly is fixed on the top surface of the experimental space, and the other end is connected to the top surface of the sealing cover.

[0013] Preferably, a scale bar for observing the height of the down is arranged on the side surface of the sample cylinder.

[0014] Preferably, an operation display screen connected with the controller and capable of presetting and outputting parameters is arranged on the cabinet.

[0015] Preferably, the cabinet further comprises a steam generator and an air compressor connected with the first air outlet and the second air outlet respectively.

[0016] From the above description of the utility model, compared with the prior art, the utility model has the advantages that: the pre-treatment and the down pressing operation can be simultaneously performed by the utility model, the pre-treatment box can be placed on the air injection station during pre-treatment, the down feather is dried by the dry gas from the second air outlet after being wetted by the steam from the first air outlet, the down feather can be transferred to the sample cylinder during down pressing, the down pressing test cylinder is first placed on the air injection station, the down feather is scattered by the air from the second air outlet, and then the sample cylinder is moved to the down pressing station by the conveying mechanism to perform down pressing, one machine has multiple uses, space and cost are saved, the detection process is automated by the controller to accurately control the automatic operation of each mechanism, and labor is saved;

[0017] The pre-treatment box or the sample cylinder is rotated between the air injection station and the down pressing station by the rotating mechanism, the operator can place the pre-treatment box or the sample cylinder to be tested on the idle station on the other side in advance when working on one side, the completed pre-treatment box or sample cylinder can be transferred to the idle station and the pre-treatment box or sample cylinder to be tested can be conveyed to the working station when the rotating arm rotates, the operator does not need to wait for the pre-treatment or down pressing to be completed before placing the pre-treatment box or sample cylinder, and the test efficiency is greatly improved;

[0018] The guide rail and the auxiliary wheel are used for assisting the rotation of the tray, improving the stability of the rotation, and avoiding the pre-treatment box or the sample cylinder from falling off the tray during the transfer process of the conveying mechanism;

[0019] During down pressing, the electromagnetic iron is driven by the electric screw rod to adsorb the pressing disc and move downward, when the weight sensor detects that the weight changes, the pressing disc contacts the down feather and generates a downward pressure, at this time, the controller controls the electromagnetic iron to be powered off and release the pressing disc, the pressing disc automatically falls and performs down pressing, when the weight sensor detects that the weight is stable, the controller controls the mechanism to stop working, at this time, the down feather bulkiness can be accurately measured according to the value fed back by the rotary encoder. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure diagram of the utility model Figure 1 ;

[0021] Figure 2 The structure diagram of the utility model Figure 2 ;

[0022] Figure 3 The sectional view of the utility model embodiment one

[0023] Figure 4The cross-sectional view of the second embodiment of the present utility model;

[0024] Figure 5 The structure diagram of the conveying mechanism of the present utility model Figure 1 ;

[0025] Figure 6 The structure diagram of the conveying mechanism of the present utility model Figure 2 ;

[0026] Figure 7 The assembly diagram of the tray and the guide rail of the present utility model;

[0027] In the figure: 1-cabinet body;11-experimental space;12-pre-treatment box;13-sample cylinder;14-cabinet door;15-operation display screen;2-jet mechanism;21-sealing cover;22-lifting assembly;23-first air outlet;24-second air outlet;3-felting mechanism;31-pressing disc;32-telescopic assembly;321-electric screw;322-electromagnet;323-limit switch;324-rotary encoder;325-electric winch;4-conveying mechanism;41-rotary arm;42-rotary drive disc;43-tray;44-guide rail;45-auxiliary wheel;46-irregular mounting groove;5-weighing sensor. DETAILED DESCRIPTION

[0028] The present utility model will be further described through the specific implementation manner.

[0029] Embodiment one:

[0030] Referring to the drawings in the specification (except Figure 4 ), a down loft tester comprises a cabinet body 1, a jet mechanism 2, a felting mechanism 3, a conveying mechanism 4, a steam generator, an air compressor and a control system.

[0031] The cabinet body 1 is provided with a constant-temperature and constant-humidity experimental space 11, and the experimental space 11 is provided with a pre-treatment box 12 or a sample cylinder 13. The pre-treatment box 12 is a cuboid structure with a rectangular bottom surface, yarn windows on four side surfaces and an open top surface. The sample cylinder 13 is a cylindrical structure with a circular bottom surface, a transparent side surface and an open top surface. The heights of the pre-treatment box 12 and the sample cylinder 13 are consistent, which facilitates the universality of the equipment. The sample cylinder 13 is provided with a scale bar for direct observation of the height of down by the operator. The cabinet body 1 is a constant-temperature and constant-humidity experimental cabinet commonly used in the prior art, which can provide a constant-temperature and constant-humidity environment. The cabinet body 1 is further provided with a cabinet door 14 that can open or close the experimental space 11. When the cabinet door 14 is closed, a constant-temperature and constant-humidity environment can be created in the experimental space 11, so as to meet the condition that the down loft test by the felting test in the steam reduction method in GB / T 14272-2021 should be operated in a constant-temperature and constant-humidity room. This is not the focus of the present application, and the structure and selection thereof will not be described further.

[0032] The air jet mechanism 2 is arranged on the left side of the top surface of the experimental space 11, and the position directly below the air jet mechanism 2 is an air jet station, which comprises a sealing cover 21, a lifting assembly 22, a first air outlet 23 and a second air outlet 24, and the sealing cover 21 is arranged in a lifting manner; the lifting assembly 22 is connected between the top surface of the experimental space 11 and the sealing cover 21 to drive the lifting of the sealing cover 21, and the lifting assembly 22 is a common electric push rod; the size of the sealing cover 21 is greater than the size of the top surface opening of the pretreatment box 12 and the sample cylinder 13; the first air outlet 23 and the second air outlet 24 are arranged at the bottom of the sealing cover 21 and can respectively spray steam and air, and the first air outlet 23 and the second air outlet are respectively connected with a steam generator and an air compressor outside the cabinet 1, and steam and dry air can be respectively sprayed when the sealing cover 21 moves downward and seals the pretreatment box 12 or the sample cylinder 13. Through the structure, the pretreatment and the pressing operation can be carried out at the same time, the pretreatment box 12 can be placed on the air jet station during the pretreatment, the downy is dried by the dry gas sprayed through the second air outlet 24 after being wetted by the steam sprayed through the first air outlet 23, and the sample cylinder 13 is moved to the pressing station to be pressed after the downy is scattered by the air sprayed through the second air outlet 24 during the pressing. One machine is used for multiple purposes, space and cost are saved, the detection process is automated through the accurate control of the controller on the automatic operation of each mechanism, and labor is saved.

[0033] The pressing mechanism 3 is arranged on the right side of the top surface of the experimental space 11, and the position directly below the pressing mechanism 3 is a pressing station, which comprises a pressing plate 31 that can extend into the test cylinder to press the downy and a telescopic assembly 32 that drives the pressing plate 31 to move up and down, and the pressing plate 31 can extend into the sample cylinder 13 to press the downy to measure the loft. Specifically, the diameter of the pressing plate 31 is matched with the inner diameter of the sample cylinder 13, and a plurality of air holes are formed on the pressing plate 31. Further, the telescopic assembly 32 comprises an electric screw rod 321, an electromagnet 322, a limit switch 323 and a rotary encoder 324, and the electric screw rod 321 is arranged on the top surface of the experimental space 11; the electromagnet 322 is arranged at the end of the electric screw rod 321, and the pressing plate 31 can be attracted to the lower side of the electromagnet 322; the limit switch 323 is arranged at the initial position of the pressing plate 31 to sense the reset state of the pressing plate 31; and the rotary encoder 324 is connected with the electric screw rod 321 to determine the lifting height of the pressing plate 31.

[0034] The conveying mechanism 4 is arranged on the bottom surface of the experiment space 11, and drives the pre-treatment box 12 or the sample cylinder 13 to rotate between the air jet station and the pile pressing station. The conveying mechanism 4 comprises a rotating arm 41, a rotating drive disc 42, a tray 43, guide rails 44 and auxiliary wheels 45. The rotating arm 41 extends from the midpoint between the centers of the air jet station and the pile pressing station to both ends and is rotatably arranged at the midpoint. The rotating drive disc 42 is connected with the rotating arm 41 and drives the rotating arm 41 to rotate. The tray 43 is arranged at both ends of the rotating arm 41 and can be opposite to the air jet station and the pile pressing station, respectively. The pre-treatment box 12 or the sample cylinder 13 is arranged on the tray 43 and can rotate with the tray 43. The guide rails 44 are arranged in two and concentrically arranged with the rotating arm 41. The tray 43 is located between the two guide rails 44 to guide the rotation of the tray 43. The auxiliary wheels 45 are arranged on the tray 43 and can rollingly contact with the two guide rails 44 to assist the rotation of the tray 43. The guide rails 44 and the auxiliary wheels 45 are used to assist the rotation of the tray 43, improve the stability of the rotation, and avoid the pre-treatment box 12 or the sample cylinder 13 from falling off the tray 43 during the conveying of the conveying mechanism 4. The pre-treatment box 12 or the sample cylinder 13 is rotated between the air jet station and the pile pressing station by the rotating mechanism. When the operator works at one station, the operator can place the pre-treatment box 12 or the sample cylinder 13 to be tested in the idle station in advance. When the rotating arm 41 rotates, the completed pre-treatment box 12 or sample cylinder 13 can be transferred to the idle station, and the pre-treatment box 12 or the sample cylinder 13 to be tested can be conveyed to the working station. The operator does not need to wait for the pre-treatment or pile pressing to be completed before placing the pre-treatment box 12 or the sample cylinder 13, which greatly improves the test efficiency. Specifically, the tray 43 is formed with a special-shaped mounting groove 46 (as shown in Figure 5 ) which can place and fix the pre-treatment box 12 or the sample cylinder 13, respectively.

[0035] The control system comprises a weighing sensor 5 arranged on the tray 43 for measuring the weight of the sample cylinder 13 and a controller connected with each component for precisely controlling the operation of each component to ensure that the pre-treatment box 12 or the sample cylinder 13 on the tray 43 can be accurately opposite to the air jet station and the pile pressing station when the tray 43 rotates, and the controller can also control the telescopic assembly 32 to work according to the signal fed back by the weighing sensor 5 to release or retract the pressing plate 31. When the pile is pressed, the electric screw rod 321 drives the electromagnet 322 to adsorb the pressing plate 31 and move downward, and when the weighing sensor 5 monitors that the weight changes, it means that the pressing plate 31 contacts the down feather and generates downward pressure, at this time the controller controls the electromagnet 322 to be powered off and release the pressing plate 31, the pressing plate 31 automatically falls and performs pile pressing, and when the weighing sensor 5 monitors that the mass is stable, the timing starts, and after waiting for 60s, the electric screw rod 321 drives the electromagnet 322 to move downward, and when the weighing sensor 5 monitors that the mass is larger, it means that the electromagnet 322 contacts the pressing plate 31, at this time the controller controls the electromagnet 322 to be powered on to adsorb the pressing plate 31, at this time the electric screw rod 321 moves upward, at the same time the rotary encoder 324 starts to work, and when the pressing plate 31 is reset upward and contacts the limit switch 323, the controller controls the mechanism to stop working, at this time the loft of the down feather can be accurately measured according to the value fed back by the rotary encoder 324. Specifically, the cabinet 1 is provided with an operation display screen 15 connected with the controller and capable of presetting and outputting parameters. Further, the controller is a PLC controller, the control loop of which is a simple instruction transmission and calculation, and no complex operation is involved, the structure selection and programming thereof are prior art and can be directly obtained by those skilled in the art, and no further description is made here.

[0036] The steam generator and the air compressor are connected with the first air outlet 23 and the second air outlet 24 respectively, and provide steam and dry air in the cabinet 1. The structure thereof is a common steam generator and air compressor in the prior art, the installation method and control principle thereof can be directly known by those skilled in the art, and are not the focus of the present application, and are not shown in the figure, and no further description is made here.

[0037] When pre-treating, the operator places the down to be tested into a pre-treatment box 12 and places the pre-treatment box 12 on the tray 43 at the pressing station and starts the device. After the controller controls the rotary drive plate 42 to drive the rotary arm 41 to rotate and drive the tray 43 to move accurately to the air jet station, the controller controls the lifting assembly 22 to drive the sealing cover 21 to move downward to seal the pre-treatment box 12. Then the steam generator works and sprays steam from the first air outlet 23 to the down in the pre-treatment box 12 to completely wet the down and stop. Then the air compressor works and sprays dry air from the second air outlet 24 to complete the pre-treatment of the down to be tested. (During the above-mentioned air spraying process, the operator should place the next down to be tested into another pre-treatment box 12 and place it on the tray 43 at the pressing station to ensure the continuous steps of the device) After the pre-treatment is completed, the controller controls the pre-treatment box 12 after wetting and drying to rotate to the pressing station, and drives another pre-treatment box 12 to rotate to the air jet station. According to the requirements of the steam reduction method in GB / T14272-2021, the operator transfers the pre-treatment box 12 containing the wet and dried down to a standard atmospheric environment for balancing for more than 48 hours. Repeat the above steps until all the samples to be tested are pre-treated.

[0038] When testing the loft, the operator transfers a portion of the down after standing from the pre-treatment box 12 to a sample cylinder 13 and places it on the tray 43 at the pressing station and starts the device. The controller drives the rotary drive plate 42 to rotate and drives the sample cylinder 13 to rotate to the air jet station. The controller controls the lifting assembly 22 to drive the sealing cover 21 to move downward to seal the sample cylinder 13, and then the air compressor works and sprays dry gas from the second air outlet 24 to scatter the down in the cylinder, so as to meet the requirement of scattering the down before pressing in the pressing plate 31 in the steam reduction method in GB / T14272-2021 (at this time, the operator should transfer a new portion of the down after standing from the pre-treatment box 12 to another sample cylinder 13, place it on the tray 43 at the pressing station and close the cabinet door 14). After the scattering is completed, the controller controls the tray 43 to rotate to the pressing station for pressing, and rotates another sample cylinder 13 to the air jet station for scattering. After the pressing is completed and the loft is obtained, the operator takes out the sample cylinder 13 from the pressing station and places it in a new sample cylinder 13 after closing the cabinet door 14, and repeats the above steps until all the samples are tested.

[0039] When the pressing disc 31 is pressing the down, the electric screw rod 321 drives the electromagnet 322 to attract the pressing disc 31 and move downward, when the weight sensor 5 monitors the weight change, that is, the pressing disc 31 contacts the down and generates the downward pressure, at this time, the controller controls the electromagnet 322 to be powered off and release the pressing disc 31, the pressing disc 31 automatically falls and carries out the pressing, when the weight sensor 5 monitors the quality to be stable, the timing is started, after waiting for 60s, the electric screw rod 321 drives the electromagnet 322 to move downward, when the weight sensor 5 monitors the quality to be large again, that is, the electromagnet 322 contacts the pressing disc 31, at this time, the controller controls the electromagnet 322 to be powered on and attract the pressing disc 31, at this time, the electric screw rod 321 moves upward, at the same time, the rotary encoder 324 starts to work, when the pressing disc 31 is reset upward and contacts the limit switch 323, the controller controls the mechanism to stop working, at this time, according to the value of the rotary encoder 324, the downy bulkiness can be accurately measured and fed back on the operation display screen.

[0040] The application can carry out the pretreatment and the pressing operation simultaneously, is multipurpose, saves the space and the cost, and can greatly improve the test efficiency, and has high practicability.

[0041] Embodiment two:

[0042] The difference between the embodiment and the embodiment one is that the telescopic mechanism 32 comprises an electric winch 325, an electromagnet 322 and a limit switch 323 (as shown in the figure). Figure 4 Compared with the embodiment one, the structure of driving the electromagnet 322 to lift is replaced by the electric winch 325, so that the electric screw rod 321 required is avoided to be far more than the equipment height due to some sample cylinders 13 being too long (as shown in the figure). Figure 3 But the electric winch 325 cannot accurately measure the rope elongation, so that the bulkiness value reading of the structure needs to rely on the scale bar on the sample cylinder 13.

[0043] The above is only the preferred embodiment of the application, so it cannot limit the range of the application, that is, the equivalent changes and modifications made according to the application patent range and the content of the specification should still belong to the range covered by the application patent.

Claims

1. A down loft tester characterized by: The device comprises a cabinet, a jet mechanism, a down pressing mechanism, a conveying mechanism and a control system. The cabinet is provided with a constant temperature and humidity experiment space. The experiment space is provided with a pretreatment box or a sample cylinder. The jet mechanism is arranged on the left side of the top surface of the experiment space. The position directly below the jet mechanism is a jet working position. The jet mechanism comprises a seal cover arranged in a lifting mode and a first air outlet and a second air outlet arranged at the bottom of the seal cover for spraying steam and air respectively. The down pressing mechanism is arranged on the right side of the top surface of the experiment space. The position directly below the down pressing mechanism is a down pressing working position. The down pressing mechanism comprises a pressing plate capable of extending into the sample cylinder for down pressing and a telescopic component for driving the pressing plate to move up and down. The conveying mechanism is arranged on the bottom surface of the experiment space. The conveying mechanism drives the pretreatment box or the sample cylinder to rotate between the jet working position and the down pressing working position. The control system comprises a weighing sensor and a controller. The weighing sensor is arranged on the conveying mechanism for measuring the weight of the sample cylinder. The controller controls the telescopic component to work according to the signal fed back by the weighing sensor to release or retract the pressing plate.

2. A down loft tester according to claim 1, wherein: The conveying mechanism comprises a rotating arm, a rotating drive disc and a tray. The rotating arm extends from the midpoint between the centers of the jet working position and the down pressing working position to both ends and is arranged rotatable about the midpoint. The rotating drive disc is connected with the rotating arm and drives the rotating arm to rotate. The tray is arranged at both ends of the rotating arm and is opposite to the jet working position and the down pressing working position respectively. The pretreatment box or the sample cylinder is arranged on the tray and is rotatable with the tray. The weighing sensor is arranged on the tray and is in contact with the pretreatment box or the sample cylinder.

3. A down loft tester according to claim 2, wherein: The conveying mechanism further comprises guide rails and auxiliary wheels. The guide rails are arranged in two and are concentric with the rotating arm. The tray is located between the two guide rails to guide the rotation of the tray. The auxiliary wheels are arranged on the tray and are in rolling contact with the two guide rails to assist the rotation of the tray.

4. The down loft tester of claim 2, wherein: The pretreatment box is a cubic structure with a rectangular bottom surface, four side surfaces each provided with a screen window and an open top surface. The sample cylinder is a cylindrical structure with a circular bottom surface, a transparent side surface and an open top surface. The tray is formed with a special-shaped mounting groove capable of placing and fixing the pretreatment box or the sample cylinder respectively.

5. A down loft tester according to claim 4, wherein: The size of the seal cover is greater than the size of the top opening of the pretreatment box and the sample cylinder. The diameter of the pressing plate is matched with the inner diameter of the sample cylinder. A plurality of air permeable holes are formed in the pressing plate.

6. The down loft tester of claim 1, wherein: The telescopic component comprises an electric screw, an electromagnet, a limit switch and a rotary encoder. The electric screw is arranged on the top surface of the experiment space. The electromagnet is arranged at the end of the electric screw. The pressing plate is adsorbed below the electromagnet. The limit switch is arranged at the initial position of the pressing plate to sense the reset state of the pressing plate. The rotary encoder is connected with the electric screw to determine the lifting height of the pressing plate.

7. The down loft tester of claim 1, wherein: The jet mechanism further comprises a lifting assembly for driving the seal cover to move up and down. One end of the lifting assembly is fixed on the top surface of the experiment space. The other end of the lifting assembly is connected with the top surface of the seal cover.

8. The down loft tester of claim 4, wherein: A scale bar for observing the height of down is arranged on the side surface of the sample cylinder.

9. The down loft tester of claim 1, wherein: An operation display screen connected with the controller and capable of presetting and outputting parameters is arranged on the cabinet.

10. The down loft tester of claim 1, wherein: A steam generator and an air compressor connected with the first air outlet and the second air outlet respectively are further included.

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