A drawer type differential pressure gas permeability tester

Abstract

The application provides a drawer type differential pressure gas permeability tester and relates to the field of gas permeability testing. The tester comprises an outer casing, an inner casing, an upper pressing block, a lower pressing block, a first driver and a second driver. The inner casing is fixed to the inside of the outer casing. The upper pressing block and the lower pressing block are both installed in the inner casing. A drawer opening is formed through the side of the outer casing and the inner casing. The upper pressing block is vertically movably installed in the inner casing and is in transmission connection with the first driver. The lower pressing block is horizontally movably installed at the drawer opening and is in transmission connection with the second driver. The lower pressing block has a drawn-out state and a closed state. When the lower pressing block is in the closed state, the lower pressing block is located below the upper pressing block, the upper pressing block and the lower pressing block are pressed tightly to seal a sample, an upper space is formed between the upper pressing block and the sample, and a lower space is formed between the lower pressing block and the sample. The lower pressing block is provided with a second air pressure sensor, a gas pipeline and a vacuum pump. The gas pipeline is connected between the vacuum pump and the lower space of the sample.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas permeability testing, in particular to a drawer type differential pressure gas permeability tester. BACKGROUND

[0002] With the rapid development of packaging technology, the performance of packaging materials plays an increasingly important role in product preservation. In particular, the gas permeability of the packaging film directly affects the shelf life of the product.

[0003] A device and method for testing the permeability of organic gas to film are disclosed in Chinese Patent No. CN102928326B, issued on March 25, 2015, which specifically includes a test chamber, a test gas pipeline, a carrier gas pipeline, a six-way valve, a quantitative element, an analysis device, and a vacuum generating device. Each element is connected by a pipeline, and each pipeline is provided with a corresponding valve. The pipe opening of the six-way valve is connected to the test chamber, the quantitative element, the analysis device, and the vacuum generating device through the corresponding pipeline. The test chamber includes an upper chamber and a lower chamber, and the sample is placed between the upper chamber and the lower chamber, forming a closed cavity between the upper chamber and the sample. The test gas volatilized from the organic reagent carrier in the upper chamber permeates through the sample. During testing, the vacuum generating device is turned on to evacuate the lower chamber, and the test gas permeates through the sample and enters the quantitative element through the pipeline. After the permeation is completed, the pressure of the lower chamber is balanced, and finally the test gas in the quantitative element is carried to the analysis device for testing.

[0004] The device for testing the permeability of organic gas to film in the prior art adopts the structural design of a test chamber, a quantitative element, a vacuum generating device, and corresponding pipelines. During testing, the upper chamber and the lower chamber need to be manually separated, the sample is then placed in the test chamber, and then the upper chamber and the lower chamber are closed and sealed in place. This can easily affect the test results due to improper sample placement and sealing, and the overall machine has low automation, poor testing efficiency, and low precision. SUMMARY

[0005] To solve the above problems, the purpose of the present application is to provide a drawer type differential pressure gas permeability tester to solve the problem of manual operation, which can easily affect the test results due to improper sample placement and sealing, and the overall machine has low automation, poor testing efficiency, and low precision.

[0006] The technical scheme of the drawer type differential pressure gas permeability tester of the present application is as follows:

[0007] The drawer type differential pressure gas permeability tester includes an outer casing, an inner casing, an upper pressing block, a lower pressing block, a first driver, and a second driver. The inner casing is fixed inside the outer casing, and the upper pressing block and the lower pressing block are both installed in the inner casing.

[0008] The side of the outer casing and the side of the inner casing are provided with a drawer opening, the upper pressing block is vertically movably arranged in the inner casing, and the first driver is in transmission connection with the upper pressing block; the lower pressing block is horizontally movably arranged at the drawer opening, and the second driver is in transmission connection with the lower pressing block;

[0009] The lower pressing block has an extracted state and a closed state, in the closed state, the lower pressing block is located at the lower side of the upper pressing block, and the upper pressing block is pressed against the lower pressing block to seal the sample, an upper space is formed between the upper pressing block and the sample, and a lower space is formed between the lower pressing block and the sample;

[0010] The upper pressing block is provided with a first air pressure sensor in communication with the upper space of the sample, the lower pressing block is provided with a second air pressure sensor, a gas pipeline and a vacuum pump, the gas pipeline is connected between the vacuum pump and the lower space of the sample, and the second air pressure sensor is in communication with the lower space of the sample.

[0011] Further, a first groove is formed in the lower side of the upper pressing block, a second groove is formed in the upper side of the lower pressing block, the profile shape of the first groove is the same as that of the second groove, and a boss is further arranged in the second groove, the top surface of the boss is used for supporting the sample.

[0012] Further, the first driver is a pneumatic cylinder, the pneumatic cylinder is arranged outside the inner casing, a through hole is formed in the upper portion of the inner casing, a push rod of the pneumatic cylinder penetrates through the through hole, and the upper pressing block is arranged at the lower end of the push rod of the pneumatic cylinder; alternatively, the first driver is a hydraulic cylinder or a lead screw motor.

[0013] Further, an automatic alignment structure is connected between the lower end of the push rod of the pneumatic cylinder and the upper pressing block.

[0014] Further, a first travel switch and a second travel switch are further arranged in the inner casing, the first travel switch and the second travel switch are respectively in electrical connection with the second driver;

[0015] The first travel switch is arranged close to the drawer opening to control the second driver to stop when the lower pressing block is in the extracted state; and the second travel switch is arranged away from the drawer opening to control the second driver to stop when the lower pressing block is in the closed state.

[0016] Further, a guide block is fixed to the lower inner wall of the inner casing, a guide rail is fixed to the outer portion of the lower pressing block, the guide block and the guide rail are in sliding cooperation, and the sliding direction of the guide rail extends horizontally towards the drawer opening.

[0017] The second driver is a screw nut mechanism, which comprises a motor, a screw and a ball nut, the motor is rotationally connected with the screw, the axis direction of the screw is arranged parallel to the extending direction of the guide rail, the ball nut is fixedly connected with the lower pressing block, and the ball nut is threadedly connected with the screw; or the second driver is any one of a pneumatic cylinder, a hydraulic cylinder, a gear and rack mechanism, a belt driving mechanism and a chain driving mechanism.

[0018] Further, the outer side of the lower pressing block is fixedly installed with a decorative plate, the decorative plate is matched with the drawer opening of the outer cabinet in concave-convex mode, and when the lower pressing block is in the closed state, the decorative plate is stop matched with the drawer opening of the inner cabinet.

[0019] Further, the side of the outer cabinet is further installed with an electronic switch, the outer cabinet is provided with a control mainboard, and the electronic switch, the first driver and the second driver are electrically connected with the control mainboard, so that when the electronic switch is operated, the control mainboard controls the first driver and the second driver to start.

[0020] Further, the inner part of the lower pressing block is provided with an inner channel, and the lower pressing block is further installed with a solenoid valve, which is located between the inner channel and the gas pipeline.

[0021] Further, the inner cabinet is a heat preservation cabinet, and a temperature control adjustment module is further installed on the inner cabinet; an indicating lamp is installed on the outer cabinet, and the indicating lamp is electrically connected with the control mainboard to display the working state of the tester.

[0022] Beneficial effects: the drawer type differential pressure gas permeability tester adopts the design form of outer cabinet, inner cabinet, upper pressing block, lower pressing block, first driver and second driver, the main machine is a double-layer cabinet structure of outer cabinet and inner cabinet, the side of the outer cabinet and the side of the inner cabinet are provided with a drawer opening in communication, the upper pressing block is vertically movably installed in the inner cabinet, the upper pressing block is driven to move up and down by the first driver, the lower pressing block is horizontally movably installed at the drawer opening, and the lower pressing block is driven to move out of or into the drawer opening by the second driver. When the lower pressing block is in the extracted state, the sample can be accurately placed on the lower pressing block, avoiding the interference of the upper pressing block on the placement of the sample, and improving the accuracy of the sample operation.

[0023] And, when the lower pressing block is in the closed state, the lower pressing block enters the inner shell, the upper pressing block is tightly fitted with the lower pressing block and seals the sample, and the sample is separated between the upper pressing block and the lower pressing block to divide the upper space and the lower space; when starting the test, the vacuum pump is started to draw the lower space to a set negative pressure, and then the vacuum pump is controlled to stop running, the first air pressure sensor and the second air pressure sensor are used to detect the air pressure of the upper space of the sample and the lower space of the sample respectively, and the gas permeability of the sample is obtained according to the pressure difference change.

[0024] Since the lower pressing block is designed to be opened and closed in a drawer type, the lofting operation can be accurately performed, the first driver drives the upper pressing block to automatically press the lower pressing block after the pressing block is moved in, so that the sealing can be ensured to be in place, the test result is prevented from being affected due to the lofting and sealing not being in place, the whole machine has high automation degree, and the test efficiency and precision are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of the drawer type differential pressure gas permeability tester in the specific embodiment of the drawer type differential pressure gas permeability tester of the present application.

[0026] Figure 2 It is a perspective view of the inner shell in the specific embodiment of the drawer type differential pressure gas permeability tester of the present application.

[0027] Figure 3 It is an internal structure diagram of the inner shell in the specific embodiment of the drawer type differential pressure gas permeability tester of the present application.

[0028] Figure 4 It is an internal structure diagram of the inner shell (without the upper pressing block) in the specific embodiment of the drawer type differential pressure gas permeability tester of the present application.

[0029] Figure 5 It is a principle schematic diagram of the drawer type differential pressure gas permeability tester in the specific embodiment of the drawer type differential pressure gas permeability tester of the present application.

[0030] In the figure: 1, outer shell; 10, drawer opening; 11, electronic switch; 12, indicator light;

[0031] 2, inner shell; 20, decorative plate; 21, guide block; 22, guide rail; 23, first travel switch; 24, second travel switch; 25, temperature control adjustment module; 26, fixed support column;

[0032] 3, upper pressing block; 30, automatic alignment structure; 31, first air pressure sensor; 4, lower pressing block; 40, second groove; 400, boss; 41, second air pressure sensor; 42, gas pipeline; 43, vacuum pump; 44, electromagnetic valve;

[0033] 5. First drive; 6. Second drive; 61. Motor; 62. Lead screw; 63. Ball nut. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0035] The specific embodiment 1 of the drawer-type pressure differential gas permeability tester of the present invention is as follows: Figures 1 to 5 As shown, the drawer-type differential pressure gas permeability tester includes an outer casing 1, an inner casing 2, an upper pressure block 3, a lower pressure block 4, a first driver 5 and a second driver 6. The inner casing 2 is fixed to the inside of the outer casing 1, and the upper pressure block 3 and the lower pressure block 4 are both installed in the inner casing 2; a drawer opening 10 is provided through the side of the outer casing 1 and the side of the inner casing 2, the upper pressure block 3 is installed in the inner casing 2 for vertical movement, and the first driver 5 is transmission-connected to the upper pressure block 3; the lower pressure block 4 is installed at the drawer opening 10 for horizontal movement, and the second driver 6 is transmission-connected to the lower pressure block 4.

[0036] The lower pressing block 4 has a pulled-out state and a closed state. In the closed state, the lower pressing block 4 is located on the lower side of the upper pressing block 3, and the upper pressing block 3 and the lower pressing block 4 are pressed tightly to seal the sample. An upper space is formed between the upper pressing block 3 and the sample, and a lower space is formed between the lower pressing block 4 and the sample; the upper pressing block 3 is provided with a first air pressure sensor 31, and the first air pressure sensor 31 is communicated with the upper space of the sample; the lower pressing block 4 is provided with a second air pressure sensor 41, a gas pipeline 42 and a vacuum pump 43, and the gas pipeline 42 is connected between the vacuum pump 43 and the lower space of the sample, and the second air pressure sensor 41 is communicated with the lower space of the sample.

[0037] This drawer-type differential pressure gas permeability tester utilizes an outer housing 1, an inner housing 2, an upper pressure block 3, a lower pressure block 4, a first driver 5, and a second driver 6. The main unit comprises a double-layer structure comprising the outer housing 1 and the inner housing 2. A drawer opening 10 is provided through the sides of the outer housing 1 and the inner housing 2. The upper pressure block 3 is mounted vertically within the inner housing 2 and is driven up and down by the first driver 5. The lower pressure block 4 is mounted horizontally at the drawer opening 10 and is driven in and out of the drawer opening 10 by the second driver 6. When the lower pressure block 4 is withdrawn, the sample can be accurately placed on the lower pressure block 4, preventing the upper pressure block 3 from being located above the lower pressure block 4 and interfering with sample placement, thereby improving the accuracy of the sample placement operation.

[0038] Moreover, when the lower pressing block 4 is in the closed state, the lower pressing block 4 enters the inner shell 2, the upper pressing block 3 is tightly matched with the lower pressing block 4 and seals the sample, and the sample is separated by the upper pressing block 3 and the lower pressing block 4 to divide the upper space and the lower space; when starting the test, the vacuum pump 43 is started to draw the lower space to a set negative pressure, and then the vacuum pump 43 is controlled to stop running, and the first air pressure sensor 31 and the second air pressure sensor 41 are used to detect the air pressure of the upper space of the sample and the lower space of the sample respectively, and the gas permeability of the sample is obtained according to the pressure difference change. Since the lower pressing block 4 is designed to be opened and closed in a drawer type, it is convenient to accurately perform the sample operation, the first driver 5 drives the upper pressing block 3 to automatically press the lower pressing block 4 after the lower pressing block 4 is moved in, so as to ensure that the sealing can be in place, prevent the test result from being affected due to the sample and the sealing not being in place, and improve the test efficiency and precision.

[0039] In the embodiment, the lower side of the upper pressing block 3 is provided with a first groove, the upper side of the lower pressing block 4 is provided with a second groove 40, the profile shape of the first groove is the same as that of the second groove 40, and the inside of the second groove 40 is further provided with a boss 400, and the top surface of the boss 400 is used to support the sample. The upper edge of the second groove 40 is provided with an annular sink, and the annular sink and the second groove 40 form a stepped structure, the sample can be placed on the bottom surface of the annular sink, and the top surface of the boss 400 is flush with the bottom surface of the annular sink, the top surface of the boss 400 can support the middle part of the sample, ensure that the upper space and the lower space are under the pressure difference condition, the sample will not be deformed, and the reliability of the differential pressure gas permeability test is ensured.

[0040] The first driver 5 is a gas cylinder, the gas cylinder is arranged outside the inner shell 2, the upper part of the inner shell 2 is provided with a through hole, the push rod of the gas cylinder penetrates through the through hole, and the upper pressing block 3 is installed at the lower end of the push rod of the gas cylinder; the gas cylinder is used to drive the upper pressing block 3 to move up and down, before the lower pressing block 4 is drawn out, the upper pressing block 3 is first driven to move upward and separate from the lower pressing block 4, and after the lower pressing block 4 enters the drawer opening 10, the upper pressing block 3 is driven to move downward to accurately press the lower pressing block 4.

[0041] The lower end of the push rod of the gas cylinder is connected with the upper pressing block 3 through an automatic alignment structure 30, the automatic alignment structure 30 is designed like a movable joint, the activity freedom degree of the upper pressing block 3 is increased, the upper pressing block 3 and the lower pressing block 4 are tightly matched in place, and the sealing effect on the sample is improved. In other embodiments, in order to meet different use requirements, the first driver is not limited to the gas cylinder, and the gas cylinder can be replaced by a hydraulic cylinder or a lead screw motor.

[0042] In the embodiment, the inner housing 2 is further provided with a first stroke switch 23 and a second stroke switch 24, the first stroke switch 23 and the second stroke switch 24 are electrically connected with the second driver 6 respectively; the first stroke switch 23 is arranged close to the drawer opening 10 to control the second driver 6 to stop when the pressing block 4 is in the extracted state; the second stroke switch 24 is arranged away from the drawer opening 10 to control the second driver 6 to stop when the pressing block 4 is in the closed state. Two stroke switches are used to detect whether the pressing block 4 is moved to the position and control the pressing block 4 to accurately stop at the corresponding position, and the automation control has higher precision.

[0043] As a further preferred scheme, the lower inner wall of the inner housing 2 is fixed with a guide block 21, the outer part of the pressing block 4 is fixed with a guide rail 22, the guide block 21 and the guide rail 22 are in sliding fit, and the sliding direction of the guide rail 22 extends horizontally towards the drawer opening 10; the second driver 6 is a lead screw nut mechanism, the lead screw nut mechanism 6 includes a motor 61, a lead screw 62 and a ball nut 63, the motor 61 is rotationally connected with the lead screw 62, the axis direction of the lead screw 62 is arranged parallel to the extension direction of the guide rail 22, the ball nut 63 is fixedly connected with the pressing block 4, and the ball nut 63 is in threaded fit with the lead screw 62. In other embodiments, the second driver is not limited to the lead screw nut mechanism, in order to meet different use requirements, the second driver can also select any one of a pneumatic cylinder, a hydraulic cylinder, a gear and rack mechanism, a belt driving mechanism and a chain driving mechanism, which can achieve the purpose of driving the horizontal movement of the pressing block.

[0044] When the pressing block 4 is extracted outward, the motor 61 is controlled to drive the lead screw 62 in the forward direction, so as to make the ball nut 63 and the pressing block 4 translate outward; when the pressing block 4 enters inward, the motor 61 is controlled to drive the lead screw 62 in the reverse direction, so as to make the ball nut 63 and the pressing block 4 translate inward. Moreover, the outer side of the pressing block 4 is fixedly installed with a decorative plate 20, the decorative plate 20 is in concave-convex fit with the drawer opening of the outer housing 1, and when the pressing block 4 is in the closed state, the decorative plate 20 is in stop fit with the drawer opening of the inner housing 2, thereby improving the appearance regularity of the whole machine.

[0045] The side surface of the outer housing 1 is further installed with an electronic switch 11, the outer housing 1 is provided with a control mainboard, the electronic switch 11, the first driver 5 and the second driver 6 are electrically connected with the control mainboard, so that when the electronic switch 11 is operated, the control mainboard controls the first driver 5 or the second driver 6 to start. Moreover, the first stroke switch 23 and the second stroke switch 24 are electrically connected with the control mainboard, the control mainboard receives corresponding electrical signals from the electrical switch, the first stroke switch 23 and the second stroke switch 24, and then controls the first driver 5 and the second driver 6 to start or stop.

[0046] The inside of the lower pressing block 4 is provided with an inner channel, and the lower pressing block 4 is further provided with an electromagnetic valve 44, which is located between the inner channel and the gas pipeline 42. Before testing, the machine is connected with a computer, and a worker operates the test software of the computer. When the upper pressing block 3 and the lower pressing block 4 are pressed into position, the electromagnetic valve 44 is first opened, the vacuum pump 43 runs to draw the lower space of the sample to a set negative pressure, and then the electromagnetic valve 44 is closed, and the vacuum pump 43 stops running. When the test is completed, the gas pressure of the lower space of the sample is released, the data detected by the first gas pressure sensor 31 and the second gas pressure sensor 41 is calculated, and the result is presented in the form of software interface.

[0047] In addition, the lower part of the inner shell 2 is provided with a fixed support 26 connected to the bottom wall of the outer shell 1, the inner shell 2 is a heat preservation shell, and the inner shell 2 is further provided with a temperature control adjustment module 25, which can complete the test of the sample under the condition of setting temperature. The outer shell 1 is provided with an indicating lamp 12 electrically connected with the control mainboard to display the working state of the tester, so that the worker can obtain the running state of the machine in real time.

[0048] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can be made, and these improvements and replacements should be considered as the protection scope of the present application.

Claims

1. A drawer-type differential pressure gas permeability tester, characterized in that: The device comprises an outer casing, an inner casing, an upper pressing block, a lower pressing block, a first driver and a second driver, wherein the inner casing is fixed to the interior of the outer casing, and the upper pressing block and the lower pressing block are both installed in the inner casing; A drawer opening is formed on the side of the outer casing and the side of the inner casing; the upper pressing block is installed in the inner casing for vertical movement, and the first driver is in transmission connection with the upper pressing block; the lower pressing block is installed at the drawer opening for horizontal movement, and the second driver is in transmission connection with the lower pressing block; The lower pressing block has a withdrawn state and a closed state. In the closed state, the lower pressing block is located at the lower side of the upper pressing block, and the upper pressing block and the lower pressing block are pressed tightly to seal the sample, an upper space is formed between the upper pressing block and the sample, and a lower space is formed between the lower pressing block and the sample; The upper pressing block is provided with a first air pressure sensor, which is in communication with the upper space of the sample; the lower pressing block is provided with a second air pressure sensor, a gas pipeline and a vacuum pump, the gas pipeline is connected between the vacuum pump and the lower space of the sample, and the second air pressure sensor is in communication with the lower space of the sample; A first groove is formed on the lower side of the upper pressing block, and a second groove is formed on the upper side of the lower pressing block. The contour shape of the first groove is the same as the contour shape of the second groove, and a boss is further formed inside the second groove, and the top surface of the boss is used to cooperate with the sample support; The inner housing is further provided with a first travel switch and a second travel switch, wherein the first travel switch and the second travel switch are electrically connected to the second driver respectively; The first travel switch is arranged near the drawer opening to control the second driver to stop when the lower pressing block is in the withdrawn state; The second travel switch is arranged away from the drawer opening to control the second driver to stop when the pressing block is in a closed state.

2. The drawer-type differential pressure gas permeability tester according to claim 1, characterized in that: The first driver is a cylinder, which is arranged on the outside of the inner shell. A through hole is opened on the upper part of the inner shell, and the push rod of the cylinder passes through the through hole. The upper pressure block is installed on the lower end of the push rod of the cylinder; or, the first driver is a hydraulic cylinder or a screw motor.

3. The drawer-type differential pressure gas permeability tester according to claim 2, characterized in that: An automatic alignment structure is connected between the lower end of the push rod of the cylinder and the upper pressing block.

4. The drawer-type differential pressure gas permeability tester according to claim 1, characterized in that: A guide block is fixed to the lower inner wall of the inner shell, and a guide rail is fixed to the outside of the lower pressing block. The guide block is slidably engaged with the guide rail, and the sliding direction of the guide rail extends horizontally toward the drawer opening; The second driver is a screw-nut mechanism, which includes a motor, a screw and a ball nut. The motor is connected to the screw for rotation, the axial direction of the screw is arranged parallel to the extension direction of the guide rail, the ball nut is fixedly connected to the lower pressure block, and the ball nut is matched with the screw thread; or, the second driver is any one of a cylinder, a hydraulic cylinder, a rack and pinion mechanism, a belt drive mechanism and a chain drive mechanism.

5. The drawer-type differential pressure gas permeability tester according to claim 1, characterized in that: A decorative plate is fixedly mounted on the outer side of the pressing block, and the decorative plate is matched with the drawer opening of the outer shell in a concave-convex manner. When the pressing block is in a closed state, the decorative plate is blocked and matched with the drawer opening of the inner shell.

6. The drawer-type differential pressure gas permeability tester according to claim 1, characterized in that: An electronic switch is also installed on the side of the outer casing, and a control mainboard is provided in the outer casing. The electronic switch, the first driver, and the second driver are electrically connected to the control mainboard respectively, so that when the electronic switch is operated, the control mainboard controls the first driver and the second driver to start.

7. The drawer-type differential pressure gas permeability tester according to claim 1, characterized in that: An inner channel is provided inside the lower pressing block, and an electromagnetic valve is also installed on the lower pressing block. The electromagnetic valve is located between the inner channel and the gas pipeline.

8. The drawer-type differential pressure gas permeability tester according to claim 6, characterized in that: The inner shell is a heat-insulating shell, and a temperature control module is also installed on the inner shell; an indicator light is installed on the outer shell, and the indicator light is electrically connected to the control main board to display the working status of the measuring instrument.

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