CN211043024U

CN211043024U - Permeability meter

Info

Publication number: CN211043024U
Application number: CN201922027900.6U
Authority: CN
Inventors: 胡忠礼
Original assignee: Guangzhou Runhu Instruments Co ltd
Current assignee: Guangzhou Runhu Instruments Co ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-07-17
Anticipated expiration: 2029-11-22

Abstract

The utility model discloses a permeability apparatus, including flat board, support, container cylinder body, piston, motor, support and test platform are installed to dull and stereotyped top, fixed drum is connected to dull and stereotyped below, there is the piston in the drum, piston below fixed connection uide pin, uide pin remove the limit on the perpendicular slotted hole in drum side, like this, guarantee that the piston can only the up-and-down motion and can not rotate. The ball screw is installed and connected in the piston, the lower portion of the ball screw is connected with the bearing, the bearing seat and the synchronous pulley set, and one end of the synchronous pulley set is connected with the motor. The upper portion of support is provided with the cylinder, the cylinder hub connection measures the pressure head, and this air permeability appearance passes through the rotation of motor and drives the up-and-down motion of piston, can acquire the air flow that passes through of sample on the measuring platform face accurately through the rotational speed that reads the motor to calculate the air permeability of sample, guaranteed the measurement accuracy of the air permeability appearance of this structure, enlarged the test range of air permeability appearance.

Description

Permeability meter

Technical Field

The utility model relates to a gas permeability device field especially relates to a permeability apparatus.

Background

The gas permeability tester is widely applied to the industries of food, medicine packaging and the like. The method is specially suitable for measuring the air permeability of materials such as paper, plastic films, composite films, permeable membranes and the like. To calculate the gas permeability, a conventional gas permeability meter is measured by a rotameter. The rotameter means that when gas flows through a certain aperture, the gas transmittance is obtained by pushing the rotor to obtain the force. Due to the large error of the rotameter and when the flow is relatively low, the rotameter does not function at all. This limits the range of use and measurement accuracy of the air permeability apparatus.

Disclosure of Invention

The present invention is directed to a permeability meter for solving the above problems.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

the utility model provides an air permeability instrument, includes flat board, drum, piston, motor, the dull and stereotyped top is provided with the support, the well upper portion of support is provided with the cylinder, the telescopic shaft of cylinder is connected and is measured the pressure head, the top is provided with measuring platform in the flat board, the below is provided with the drum in the flat board, there is the piston in the drum, erection joint ball screw in the piston, piston below fixed connection uide pin, ball screw sub-unit connection bearing, bearing frame and hold-in range wheelset, drum bottom fixed mounting motor board, fixed mounting motor on the motor board, a band pulley of hold-in range wheelset is fixed on ball screw, and another band pulley is fixed epaxially at the motor.

In the structure, the motor is powered on, the motor rotates to drive the piston to move downwards to the lower end initial position through the synchronous pulley group and the ball screw, a sample to be measured is placed on the measuring platform, and the telescopic shaft drives the pressure head to compress the sample after the air cylinder is ventilated. And (3) reversing the motor, and adjusting the rotating speed of the motor according to the requirement of the test differential pressure value on two sides of the sample and the actual air permeability condition of the sample. And when the pressure difference value and the air permeability of the sample are balanced with the rotating speed of the motor, recording the pressure difference and the rotating speed of the motor at the moment. And calculating the flow passing through the sample according to the inner sectional area of the cylinder, the screw pitch of the screw rod, the speed ratio of the synchronous pulley set and the rotating speed of the motor.

The air flow through the sample on the measuring platform (9) was F = L A/S = V B C A

F-the flow rate of the sample, L-the distance of the piston moving upwards, A-the sectional area in the cylinder of the container, S-the time, B-the screw pitch of the screw rod, V-the rotating speed of the motor, and C-the speed ratio of the synchronous pulley set.

Since B, C, A is constant, the flow rate F of the sample through the test platform is directly proportional to the motor rotation speed V. The flow F of the test sample passing through the test platform can be accurately calculated according to the rotating speed V of the motor. In the technology, the used motor and the screw rod are respectively a servo motor and a ball screw, and because the rotating speed precision of the servo motor in the prior art is more than one hundred thousand, and the screw pitch error of the ball screw is less than 0.25%, the measurement precision of the flow F is greatly improved, and the accurate measurement can be carried out even if the flow is lower, so that the test range and the measurement precision of the air permeability instrument with the structure are ensured.

Further, the ball screw is provided with a threaded shaft shoulder, and a thrust ball bearing is matched below the threaded shaft shoulder.

Furthermore, a sealing ring matched with the inner wall of the cylinder is arranged on the outer circular surface of the upper end of the piston.

Furthermore, a groove is formed in the upper end face of the cylinder, and a rubber mat is placed in the groove.

Furthermore, a ventilation round hole is arranged at the center of the measuring platform, and the sealing gas in the cylinder flows out through the sample through the hole

Furthermore, the lower end of the piston body is provided with a center hole, and the piston body is fixedly sleeved on the ball screw nut through the center hole.

Furthermore, a guide groove is formed in one side of the lower end of the cylinder.

Has the advantages that: the utility model discloses a rotation of motor drives the up-and-down motion of piston, and the air flow that passes through of sample on the measuring platform face can be acquireed accurately through the rotational speed of reading the motor to calculate the air permeability of sample, guaranteed the measuring accuracy of the air permeability appearance of this structure, enlarged the test range of air permeability appearance.

Drawings

Fig. 1 is a schematic structural diagram of the air permeability meter of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

the air permeability instrument shown in figure 1 comprises a flat plate (10), a cylinder (5), a piston (4) and a motor (13), wherein a support (6) is arranged above the flat plate (10), a cylinder (7) is arranged at the middle upper part of the support (6), a telescopic shaft of the cylinder (7) is connected with a measuring pressure head (8), a measuring platform (9) is arranged above the flat plate (10), the cylinder (5) is arranged below the flat plate (10), the piston (4) is arranged in the cylinder (5), a ball screw (11) is arranged and connected in the piston (4), a guide pin (3) is fixedly connected below the piston (4), the lower part of the ball screw (11) is connected with a bearing (12), a bearing seat (2) and a synchronous pulley group (14), the bottom of the cylinder (5) is fixedly provided with a motor plate (1), and the motor (13) is fixedly arranged on the motor plate (1), one belt wheel of the synchronous belt wheel set (14) is fixed on the ball screw (11), and the other belt wheel is fixed on a shaft of the motor (13).

In the embodiment, the telescopic shaft of the air cylinder (7) is connected with the measuring pressure head (8)

In this embodiment, the piston (4) is mounted within a cylinder (5).

In the embodiment, the ball screw (11) is installed and connected in the piston (4), and the guide pin (3) is fixed on the piston (4).

In this embodiment, a sealing ring matched with the inner wall of the cylinder (5) is arranged on the outer circular surface of the upper end of the piston (4).

In the embodiment, the ball screw (11) is provided with a threaded shaft shoulder, and a thrust ball bearing is matched below the threaded shaft shoulder.

In the embodiment, one side of the lower end of the cylinder (5) is provided with an upper guide groove and a lower guide groove, and the guide grooves are matched with the guide pins (3) to ensure that the piston (4) can only move up and down but can not rotate.

The working principle is briefly described as follows with the attached drawings: the sample is placed on the measuring platform (9), and after the air cylinder (7) is ventilated, the air cylinder shaft extends out to drive the measuring pressure head (8) to compress the sample. The motor (13) rotates to drive the synchronous pulley set (14) to rotate, and the ball screw (11) rotates along with the synchronous pulley set. When the ball screw (11) rotates, the piston (4) moves up and down due to the action of the guide pin (3) and the guide groove. When the piston (4) moves upwards, the sealing gas at the upper half part in the cylinder (5) is only discharged from the central circular hole of the measuring platform (9) through the sample. At this time, the amount of air passing through the sample is equal to the amount of decrease in the cylindrical internal volume.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air permeability apparatus, characterized in that: comprises a flat plate (10), a cylinder (5), a piston (4) and a motor (13), wherein a support (6) is arranged above the flat plate (10), a cylinder (7) is arranged on the middle upper part of the support (6), a telescopic shaft of the cylinder (7) is connected with a measuring pressure head (8), a measuring platform (9) is arranged above the flat plate (10), the cylinder (5) is arranged below the flat plate (10), the piston (4) is arranged in the cylinder (5), the ball screw (11) is arranged and connected in the piston (4), a guide pin (3) is fixedly connected below the piston (4), the lower part of the ball screw (11) is connected with a bearing (12), a bearing seat (2) and a synchronous pulley group (14), a motor plate (1) is fixedly arranged at the bottom of the cylinder (5), the motor (13) is fixedly arranged on the motor plate (1), and a belt pulley of the synchronous pulley group (14) is fixed on the ball screw (11), the other belt wheel is fixed on the shaft of the motor (13).

2. The air permeability gauge of claim 1, wherein: and the telescopic shaft of the air cylinder (7) is connected with the measuring pressure head (8).

3. The air permeability gauge of claim 1, wherein: the piston (4) is mounted in the cylinder (5).

4. The air permeability gauge of claim 1, wherein: the ball screw (11) is installed and connected in the piston (4), and the guide pin (3) is fixed on the piston (4).

5. The air permeability gauge of claim 1, wherein: and a sealing ring matched with the inner wall of the cylinder (5) is arranged on the outer circular surface of the upper end of the piston (4).

6. The air permeability gauge of claim 1, wherein: the ball screw (11) is provided with a threaded shaft shoulder, and a thrust ball bearing is matched below the threaded shaft shoulder.

7. The air permeability gauge of claim 1, wherein: an upper guide groove and a lower guide groove are formed in one side of the lower end of the cylinder (5), and the guide grooves are matched with the guide pins (3), so that the piston (4) can only move up and down but cannot rotate.