Membrane changing device and sampler with same

Abstract

The utility model provides a membrane changing device and a sampler with the same, the membrane changing device comprises a membrane pushing mechanism for driving a filter membrane to move left and right, a filter membrane lifting mechanism for driving a new filter membrane and an old filter membrane to move up and down, a sampling head lifting mechanism for driving a sampling head to move up and down and a controller, and the controller uniformly controls the operation of the mechanisms. According to the membrane replacing device, the membrane pushing mechanism, the filter membrane lifting mechanism and the sampling head lifting mechanism are matched with one another, so that multiple filter membranes can be automatically replaced. A cam is matched with a lever structure to realize lifting of a sampling head, the structure is stable and reliable, a horizontal lead screw drives a horizontal push rod to push a filter membrane to move, a new membrane cylinder and an old membrane cylinder are arranged below a demolding mechanism, the filter membrane falls into a corresponding filter membrane barrel after being pushed to a corresponding position, and accurate positioning is not needed. The whole die changing device is compact in structure and high in reliability.

Description

Technical Field

[0001] The utility model belongs to the field of environmental monitoring equipment, and in particular relates to a membrane replacement device and a full-automatic sampler with the mechanism. Background Art

[0002] The air particle sampler captures the total suspended particulate matter and inhalable particulate matter in the ambient atmosphere by the filter membrane weighing method, and is used for routine detection of aerosols. At present, the air particle sampler mainly adopts personnel on duty, and the filter membrane needs to be replaced manually on site. When continuous long-term sampling or multi-filter membrane interval sampling is required, a lot of repetitive work is brought to the operator, and the labor intensity of the operator is greatly increased. For the sampling unit, on-site duty also increases the personnel input. There are also some automatic mold changing devices in the prior art. Multiple filter membranes are installed on a turntable, and then the filter membrane is taken out from the filter membrane hole through the multi-degree-of-freedom movement of the mechanical arm and the clamp, and placed in the sampling gas path. After the sampling is completed, it is taken out from the sampling gas path, transferred back and reliably placed in the filter membrane hole. There are many intermediate steps in the transmission, and the positioning accuracy required is high, so the reliability is low. Utility Model Content

[0003] Aiming at the technical problem of low reliability of the existing automatic membrane replacement device of the air particle sampler, the utility model provides a membrane replacement device and a sampler which have compact structure, reliable performance and can automatically replace the filter membrane.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A membrane replacement device comprises a membrane pushing mechanism, a filter membrane lifting mechanism and a sampling head lifting mechanism;

[0006] The mold pushing mechanism comprises a transfer seat, on which a new film through hole and an old film through hole are arranged, a transfer cover is installed above the transfer seat, and a horizontal push rod and a horizontal push screw driving the horizontal push rod are also installed on the transfer seat;

[0007] The filter membrane lifting mechanism includes a new membrane lifting mechanism for driving the new membrane to lift and a old membrane lifting mechanism for driving the old membrane to lift and lower;

[0008] The sampling head lifting mechanism includes a sampling head, a sampling head motor seat and a fork rotating shaft seat. The sampling head includes a sampling head cover seat and a sampling head cover located therein, and an elastic body is arranged between the sampling head cover seat and the sampling head cover; a reduction motor is installed on the sampling head motor seat, and the output shaft of the reduction motor is connected to the cam frame; a fork is hinged on the fork rotating shaft seat, and one end of the fork is connected to the sampling head cover and the other end is located at the lower part of the cam frame to form a lever structure.

[0009] Preferably, the new film lifting mechanism comprises a new film box fixed at the lower part of the new film through hole and a new film lifting limit switch installed on the transfer cover, and the bottom of the new film box is connected to the first lifting drive assembly; the old film lifting mechanism comprises an old film box fixed at the lower part of the old film through hole, and the bottom of the old film box is connected to the second lifting drive assembly;

[0010] Preferably, the new film lifting limit switch includes an optical coupling probe and a baffle seat installed on the transfer cover, a lifting shaft is installed in the baffle seat, and an elastomer is arranged between the lifting shaft and the baffle seat; the upper end of the lifting shaft is connected to the photoelectric sensor, and the lower end of the lifting shaft is connected to the lifting baffle, and the lifting baffle is located below the transfer cover.

[0011] Preferably, the first lifting drive assembly and the second lifting drive assembly both include a lifting screw, which includes a stepping motor, an encoder and a slider, the slider is connected to the filter membrane push rod, and the filter membrane push rod is connected to the box bottom.

[0012] Preferably, a bearing is installed at each end of the cam frame.

[0013] Preferably, a turntable is also mounted on the cam frame, a stopper is arranged on the edge of the turntable, and a photoelectric switch for detecting the stopper is mounted on the transfer seat.

[0014] Preferably, the horizontal pushing screw includes a stepping motor, an encoder and a slider, and the horizontal push rod is connected to the slider.

[0015] Preferably, a guide rail is provided on the transfer seat, and the horizontal push rod is installed on the guide rail.

[0016] Preferably, one end of the fork connected to the sampling head comprises two claws, and the claws are hinged to the outer wall of the sampling head.

[0017] A sampler comprises a frame, on which the membrane changing device described in any one of the above items is installed.

[0018] Compared with the prior art, the advantages and positive effects of the utility model are:

[0019] The membrane changing device realizes automatic replacement of multiple filter membranes through the cooperation of the membrane pushing mechanism, the filter membrane lifting mechanism and the sampling head lifting mechanism. The sampling head is lifted and lowered by a cam and a lever structure, and the structure is stable and reliable. The horizontal screw drives the horizontal push rod to push the filter membrane to move, and the new and old membrane cylinders are set under the demoulding mechanism. After the filter membrane is pushed to the corresponding position, it falls into the corresponding filter membrane barrel without precise positioning. The entire mold changing device has a compact structure and strong reliability.

[0020] The sampler with the membrane changing device can automatically change the membrane and automatically and continuously sample for a long time, thus greatly reducing the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the sampler of the utility model;

[0022] Figure 2 It is a partial structural schematic diagram of the membrane replacement device of the utility model;

[0023] Figure 3 for Figure 2 The schematic diagram of the structure after the transfer cover is removed;

[0024] Figure 4 for Figure 2 A cross-sectional view of the portion above the transfer cover;

[0025] Figure 5 This is a partial structural schematic diagram of the filter membrane lifting mechanism of the membrane changing device of the utility model;

[0026] In the above figures: 1, frame; 2, transfer seat; 3, new membrane through hole; 4, old membrane through hole; 5, transfer cover; 6, guide rail; 7, horizontal push rod; 8, horizontal push screw; 9, first stepper motor; 10, first encoder; 11, first slider; 12, new membrane box; 13, old membrane box; 14, cylinder; 15, cylinder claw; 16, lifting screw; 17, second stepper motor; 18, second encoder; 19, push plate; 20, membrane push rod; 21, optical coupler probe; 22, baffle seat; 23, optical coupler support Frame; 24, lifting shaft; 25, bushing; 26, compression spring; 27, photoelectric sensor; 28, lifting baffle; 29, sampling head motor seat; 30, fork shaft seat; 31, sampling head cover seat; 32, sampling head upper cover; 33, support column; 34, upper cover through hole; 35, reduction motor; 36, cam frame; 37, bearing; 38, fork; 39, claw; 40, turntable; 41, vertical photoelectric switch; 42, horizontal photoelectric switch; 43, block; 44, middle fixing plate; 45, sealing ring. DETAILED DESCRIPTION

[0027] In order to better understand the present invention, a detailed description is given below in conjunction with the accompanying drawings and embodiments.

[0028] Example: Figure 1 As shown, a particulate sampler includes a frame 1, on which an automatic membrane changing device is installed. The membrane changing device includes a membrane pushing mechanism for moving the filter membrane left and right, a filter membrane lifting mechanism for driving the new and old filter membranes to move up and down, and a sampling head lifting mechanism for driving the sampling head to move up and down. It also includes a controller, which uniformly controls the operation of the above mechanisms.

[0029] like Figure 2-Figure 4As shown, the push mold mechanism includes a transfer seat 2 fixed on the upper part of the frame 1, and the transfer seat 2 is provided with a new membrane through hole 3 for the new membrane to move up and down and an old membrane through hole 4 for the old membrane to move up and down, and a transfer cover 5 is installed on the transfer seat 2. A guide rail 6 extending from the left side to the right side is also installed on the transfer seat 2, and a horizontal push rod 7 for pushing the filter membrane clamp to move horizontally is installed on the guide rail 6. The horizontal push rod 7 is provided with moving power by a horizontal push screw 8. The horizontal push screw 8 includes a first stepper motor 9, a first encoder 10 and a first slider 11, and the horizontal push rod 7 is connected to the first slider 11. The first stepper motor 9 and the first encoder 10 are both electrically connected to the controller, and the controller receives the encoding signal and controls the operation of the stepper motor.

[0030] like Figure 5 As shown, the filter membrane lifting mechanism includes a new membrane lifting mechanism and an old membrane lifting mechanism, and the new membrane lifting mechanism includes a new membrane box 12 fixed at the lower part of the new membrane through hole 3 and a new membrane lifting limit switch installed on the transfer cover 5. The new membrane box 12 includes a cylindrical barrel 14 and a box bottom that can move freely up and down in the barrel 14, and the box bottom is connected to the first lifting drive assembly and driven to move up and down by the first lifting drive assembly. The old membrane lifting mechanism includes an old membrane box 13 fixed at the lower part of the old membrane through hole 4, and the old membrane box 13 also includes a cylindrical barrel 14 and a box bottom that can move freely up and down in the barrel 14, and the box bottom of the old membrane box 13 is connected to the second lifting drive assembly. The barrels 14 of the new membrane box 12 and the old membrane box 13 can be detachably installed on the frame 1. The frame 1 of this embodiment also includes an intermediate fixing plate 44, and the bottom surface of the transfer seat 2 and the upper surface of the intermediate fixing plate 44 are both equipped with two barrel claws 15, and the barrel 14 is clamped in the barrel claws 15, which is convenient for taking and placing the barrel 14. The first lifting drive assembly and the second lifting drive assembly both include a lifting screw 16 fixed to the lower part of the frame 1, a second stepping motor 17 and a second encoder 18, and the second stepping motor 17 and the second encoder 18 are both electrically connected to the controller. The slider of the lifting screw 16 is connected to a horizontally arranged push plate 19, and the upper part of the push plate 19 is connected to a filter membrane push rod 20, and the filter membrane push rod 20 is connected to the bottom of the box. The lifting screw 16 and the filter membrane push rod 20 are arranged vertically in parallel, with a compact structure and effective use of space.

[0031] The new film lifting limit switch includes an optical coupling bracket 23 and a baffle seat 22 installed on the transfer cover 5, and a photoelectric sensor 27 is installed on the upper end of the optical coupling bracket 23. A lifting shaft 24 that passes through the transfer cover 5 is installed in the baffle seat 22, and a shaft sleeve 25 and a compression spring 26 are arranged between the lifting shaft 24 and the baffle seat 22. The upper end of the lifting shaft 24 is connected to the optical coupling probe 21. Of course, the positions of the optical coupling probe 21 and the photoelectric sensor 27 can be interchanged. The lower end of the lifting shaft 24 is connected to the lifting baffle 28, and the lifting baffle 28 is located below the transfer cover 5. When the lifting baffle 28 is not subjected to force, the compression spring 26 presses the lifting baffle 28 downward so that the lifting baffle 28 is located below the transfer cover 5. At this time, the optical coupling probe 21 is located below the photoelectric sensor 27. When the bottom of the new membrane box 12 is driven by the first lifting drive assembly to lift the lifting baffle 28, the lifting baffle 28 moves up, and at the same time, the optical coupling probe 21 moves up to the optical coupling probe seat, triggering the optical coupling signal and transmitting it to the controller. The controller determines that the new membrane has moved to the top, controls the stepper motor of the first lifting drive assembly to stop running, and the horizontal push rod 7 starts to start, pushing the filter membrane clamp to the specified position.

[0032] like Figure 1-Figure 4 As shown, the sampling head lifting mechanism includes a sampling head, a sampling head motor seat 29 and a fork 38 rotating shaft seat 30, the sampling head includes a sampling head upper cover seat 31 and a sampling head upper cover 32 located inside the sampling head upper cover seat 31, the sampling head upper cover seat 31 is installed on the transfer cover 5 through a support column 33, and a position corresponding to the sampling head upper cover 32 on the transfer cover 5 is provided with an upper cover through hole 34 that allows the sampling head upper cover 32 to move up and down in the sampling head upper cover seat 31 and pass through. A shaft sleeve 25 and an elastic body (such as a compression spring 26, a metal shrapnel, etc.) are provided between the sampling head upper cover seat 31 and the sampling head upper cover 32. A sealing ring 45 is provided between the sampling head upper cover 32 and the sampling head upper cover seat 31, and a sealing ring 45 is also placed on the lower end surface of the sampling head upper cover 32 to achieve gas path sealing of the sampling head.

[0033] A reduction motor 35 is installed on the sampling head motor seat 29, and the output shaft of the reduction motor 35 is connected to the cam frame 36. The cam frame 36 is in a long strip shape, and a bearing 37 is installed at each end of the cam frame 36. A fork 38 is hinged on the fork 38 rotating shaft seat 30, and one end of the fork 38 includes two claws 39. The claws 39 are clamped on the sampling head cover 32 and hinged on the outer wall of the sampling head. The other end of the fork 38 is located at the lower part of the cam frame 36, and the fork 38 forms a lever structure with the fork 38 rotating shaft seat 30 as a fulcrum. When the reduction motor 35 rotates, the cam frame 36 is driven to rotate. When the bearing 37 is pressed on the fork 38, the other end of the fork 38 is lifted to lift the sampling head cover 32, and the filter membrane clamp can be accommodated under the sampling head cover 32. A turntable 40 is also installed on the cam frame 36, and two stoppers 43 are set at the diameter position of the edge of the turntable 40. A photoelectric switch for detecting the stopper 43 is installed on the transmission seat 2, and the photoelectric switch is electrically connected to the controller. Preferably, two photoelectric switches are provided, which are placed at 90 degrees along the turntable 40, one is a vertical photoelectric switch 41 and the other is a horizontal photoelectric switch 42. The two blocks 43 cooperate with the two photoelectric switches to determine the position of the upper cover 32 of the sampling head.

[0034] The rack 1 is also provided with a touch screen, through which control parameters can be input and the operating status of the equipment can be viewed.

[0035] The operation process of the membrane replacement device is as follows:

[0036] Take out the barrel 14 of the new membrane box 12, put in ten new filter membranes and install them in the corresponding barrel claws 15. The first lifting drive assembly makes the bottom of the new membrane box 12 rise until the new filter membrane at the top reaches the bottom of the transfer cover 5, and stops after triggering the optical coupling switch. At this time, the bearing 37 of the cam frame 36 is pressed on the fork 38, the upper cover 32 of the sampling head is in a raised state, and the bottom of the old membrane box 13 is at the highest position. After that, the horizontal push screw 8 of the push mold mechanism runs, and the horizontal push rod 7 pushes the new filter membrane to the bottom of the upper cover 32 of the sampling head. The reduction motor 35 rotates until the baffle on the turntable 40 triggers the horizontal photoelectric switch 42. At this time, the lower cover of the sampling head moves down to press the filter membrane, and the sampler starts sampling. After the sampling is completed, the reduction motor 35 continues to rotate until the baffle triggers the vertical photoelectric switch 41 and stops, and the lower cover of the sampling head is lifted again. The horizontal push rod 7 pushes the used old filter membrane to the old membrane through hole 4, and the old filter membrane falls into the old membrane box 13. After that, the second stepping motor 17 of the second lifting drive assembly operates to lower the bottom of the old membrane box 13 by the height of the filter membrane. Finally, the horizontal push rod 7 is reset to complete a membrane change, and the above steps are repeated until the sampling is completed.

[0037] The membrane changing device described in this embodiment realizes automatic replacement of multiple filter membranes through the cooperation of the membrane pushing mechanism, the filter membrane lifting mechanism and the sampling head lifting mechanism. The sampling head is lifted and lowered by a cam and a lever structure, and the structure is stable and reliable. The horizontal screw drives the horizontal push rod to push the filter membrane to move, and the new membrane cylinder and the old membrane cylinder are set under the demoulding mechanism. After the filter membrane is pushed to the corresponding position, it falls into the corresponding filter membrane barrel without precise positioning. The entire mold changing device has a compact structure and strong reliability.

[0038] The sampler with the membrane replacement device can automatically replace the membrane and automatically and continuously sample for a long time, which greatly reduces the labor intensity of the operator. The membrane replacement device can be applied not only to particle samplers, but also to other instruments that use filter membranes for sampling, such as resuspension sampling devices, etc.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A membrane replacement device, characterized in that: It includes a membrane pushing mechanism, a filter membrane lifting mechanism and a sampling head lifting mechanism; The film pushing mechanism comprises a transfer seat, on which a new film through hole and an old film through hole are arranged, a transfer cover is installed above the transfer seat, and a horizontal push rod and a horizontal push screw driving the horizontal push rod are also installed on the transfer seat; The filter membrane lifting mechanism includes a new membrane lifting mechanism for driving the new membrane to lift and a old membrane lifting mechanism for driving the old membrane to lift and lower; The sampling head lifting mechanism includes a sampling head, a sampling head motor seat and a fork rotating shaft seat. The sampling head includes a sampling head cover seat and a sampling head cover located therein, and an elastic body is arranged between the sampling head cover seat and the sampling head cover; a reduction motor is installed on the sampling head motor seat, and the output shaft of the reduction motor is connected to the cam frame; a fork is hinged on the fork rotating shaft seat, and one end of the fork is connected to the sampling head cover and the other end is located at the lower part of the cam frame to form a lever structure.

2. The membrane replacement device according to claim 1, characterized in that: The new film lifting mechanism includes a new film box fixed at the bottom of the new film through-hole and a new film lifting limit switch installed on the transfer cover, and the bottom of the new film box is connected to the first lifting drive assembly; the old film lifting mechanism includes an old film box fixed at the bottom of the old film through-hole, and the bottom of the old film box is connected to the second lifting drive assembly.

3. The membrane replacement device according to claim 2, characterized in that: The new film lifting limit switch includes an optical coupling probe and a baffle seat installed on the transfer cover, a lifting shaft is installed in the baffle seat, and an elastic body is arranged between the lifting shaft and the baffle seat; the upper end of the lifting shaft is connected to the photoelectric sensor, and the lower end of the lifting shaft is connected to the lifting baffle, and the lifting baffle is located below the transfer cover.

4. The membrane replacement device according to claim 2, characterized in that: The first lifting drive assembly and the second lifting drive assembly both include a lifting screw, which includes a stepping motor, an encoder and a slider, the slider is connected to the filter membrane push rod, and the filter membrane push rod is connected to the box bottom.

5. The membrane replacement device according to claim 1, characterized in that: A bearing is respectively installed at both ends of the cam frame.

6. The membrane replacement device according to claim 1, characterized in that: A turntable is also installed on the cam frame, a stopper is arranged on the edge of the turntable, and a photoelectric switch for detecting the stopper is installed on the transfer seat.

7. The membrane replacement device according to claim 1, characterized in that: The horizontal pushing screw comprises a stepping motor, an encoder and a sliding block, and the horizontal push rod is connected to the sliding block.

8. The membrane replacement device according to claim 6, characterized in that: The transfer seat is provided with a guide rail, and the horizontal push rod is installed on the guide rail.

9. The membrane replacement device according to claim 1, characterized in that: One end of the pulling fork connected to the sampling head comprises two claws, and the claws are hinged to the outer wall of the sampling head.

10. A sampler, characterized in that: It comprises a frame, on which the membrane changing device according to any one of claims 1 to 9 is installed.

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