Filter membrane punching die and punching device

Abstract

The utility model discloses a filter membrane punching die. The filter membrane punching die comprises an upper die, a middle die and a lower die, a cylindrical punch is arranged at the lower end of the upper die; a cylindrical punched hole is formed in the lower die; the middle die comprises a first middle die and a second middle die; the upper die is fixedly sleeved with the first middle die, the upper die is sleeved with the second middle die, the second middle die can move along the axis of the upper die, at least three guide columns are annularly and evenly distributed on the second middle die, and the guide columns are parallel to the axis of the upper die; first through holes in one-to-one correspondence with the guide columns are formed in the first middle mold, the upper ends of the guide columns extend to penetrate through the corresponding first through holes, and limiting heads in limiting fit with the first middle mold are mounted at the upper ends of the guide columns; when the limiting head is matched with the first middle die in a limiting mode, the bottom face of the second middle die is located below the bottom face of the cylindrical punch or flush with the bottom face of the cylindrical punch. The guide columns are sleeved with first springs located between the first middle die and the second middle die. The utility model further discloses a punching device.

Description

Technical Field

[0001] The utility model belongs to the technical field of punching, and specifically relates to a filter membrane sheet punching die and a punching device. Background Art

[0002] Membrane separation technology is a process of separating components by using the difference in the permeation rate of each component in the fluid to the membrane. Relying on the selective permeability of the membrane, small molecules can freely pass through the semipermeable membrane, while large molecules are not permeable to the selective membrane and are intercepted, thereby achieving the purpose of separating, purifying and concentrating substances in multiple components.

[0003] During the production process of the filter membrane, its selective permeability needs to be tested. During the testing process of the filter membrane, the filter membrane needs to be made into a circular sample. At present, due to the lack of special filter membrane sample making equipment, filter membrane samples are often made by scissors cutting. Although this can meet the preparation requirements of filter membrane samples to a certain extent, there are problems such as irregular shape of filter membrane samples and easy damage of filter membrane samples. At the same time, there are also shortcomings such as low efficiency and poor detection repeatability. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a filter membrane sheet punching die and a punching device, which can not only efficiently produce filter membrane samples, but also obtain filter membrane samples with regular shapes, thereby ensuring the repeatability of filter membrane detection.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] The utility model firstly proposes a filter membrane sheet punching die, comprising an upper die, a middle die and a lower die;

[0007] A cylindrical punch is provided at the lower end of the upper die; a cylindrical punching hole matching the cylindrical punch is provided in the lower die;

[0008] The middle mold includes a first middle mold and a second middle mold, and the second middle mold is located below the first middle mold;

[0009] The first middle die is fixedly sleeved outside the upper die, the second middle die is sleeved outside the upper die and can move along the axis of the upper die, at least three guide posts are evenly distributed in an annular shape on the second middle die, and the guide posts are parallel to the axis of the upper die; first through holes are provided on the first middle die corresponding to the guide posts one by one, the upper ends of the guide posts extend through the corresponding first through holes, and the upper ends of the guide posts are installed with limiting heads that cooperate with the first middle die; when the limiting heads cooperate with the first middle die, the bottom surface of the second middle die is located below the bottom surface of the cylindrical punch or is flush with the bottom surface of the cylindrical punch;

[0010] The guide column is sleeved with a first spring located between the first middle die and the second middle die.

[0011] Furthermore, the guide column adopts a bolt, the second middle mold is provided with a second through hole matching with the guide column, the lower end of the second through hole is provided with a countersunk hole for accommodating the bolt head, and the upper end of the guide column is installed with a nut matching with the first middle mold.

[0012] Furthermore, a first radial screw hole is provided on the first middle die, and a first locking screw for fixing the first middle die on the upper die is provided in the first radial screw hole.

[0013] Furthermore, the distance between the first middle die and the second middle die is greater than or equal to the axial length of the cylindrical punching hole.

[0014] The utility model also provides a punching device, including a punching machine and the filter membrane sheet punching die as described above;

[0015] The punching machine comprises a base, and the lower die is mounted on the base;

[0016] A guide rod located in the vertical direction is provided at the rear end of the base, a sliding sleeve slidably matched with the guide rod is provided on the guide rod, an upper die seat fixedly connected with the guide rod is provided on the sliding sleeve, a punching rod is provided in the upper die seat, the punching rod is located in the vertical direction and slidably matched with the upper die seat, the upper die is fixedly mounted on the punching rod, and the cylindrical punch is coaxial with the cylindrical punching hole;

[0017] An operating handle for driving the punching rod to move downward is installed on the upper die seat, a fixing rod located above the punching rod is provided on the upper die seat, a second spring is provided between the fixing rod and the punching rod, and the second spring is used to apply a vertical upward elastic force to the punching rod.

[0018] Furthermore, pads are installed on the left and right sides of the base respectively, the distance between the two pads is greater than or equal to the diameter of the cylindrical punching hole, the lower mold is installed above the two pads, and the cylindrical punching hole is located between the two pads.

[0019] Furthermore, the distance between the first middle die and the second middle die is greater than or equal to the axial length of the cylindrical punching hole.

[0020] Furthermore, a connecting head is provided at the top of the upper die, and a connecting hole matching with the connecting head is provided at the lower end of the punching rod, and the connecting head is inserted into the connecting hole.

[0021] Furthermore, a second radial threaded hole is provided on the side wall of the connecting hole, and a second locking screw for fixing the connecting head in the connecting hole is provided in the second radial threaded hole.

[0022] The beneficial effects of the utility model are:

[0023] The punching device of the utility model is characterized in that before use, the lower die is installed on the base, the first middle die is fixedly installed on the upper die, the second middle die is installed on the first middle die through the guide column, and the first middle die can be moved along the axial direction of the upper die; the upper die is installed on the punching rod; when in use, the filter membrane is placed flatly on the upper surface of the lower die, and the punching rod is driven to move downward by the operating handle, the lower surface of the first middle die first contacts with the filter membrane and presses and fixes the filter membrane, and the punching rod is continuously driven to move downward, and the cylindrical punch penetrates the filter membrane and enters the cylindrical punching hole, and a circular filter membrane sample is punched out from the filter membrane by the cooperation between the cylindrical punch and the cylindrical punching hole; the operating handle is released, the punching rod is reset under the action of the second spring, and the second middle die is reset under the action of the first spring; in this way, the punching device of the utility model can not only efficiently produce circular filter membrane samples, but also the obtained filter membrane samples have regular shapes, which can ensure the repeatability of filter membrane detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model provides the following drawings for explanation:

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the punching device of the utility model;

[0026] Figure 2 for Figure 1 The left side of the figure;

[0027] Figure 3 This is an enlarged view of area A in the figure;

[0028] Figure 4 It is a structural schematic diagram of a filter membrane punching die;

[0029] Figure 5 The filter membrane samples are obtained by punching;

[0030] Figure 6 This is the filter membrane sample obtained by shearing.

[0031] Description of reference numerals:

[0032] 10-upper die; 101-cylindrical punch; 102-connector; 11-lower die; 111-cylindrical punch; 12-first middle die; 121-first radial screw hole; 122-first locking screw; 123-first through hole; 13-second middle die; 131-guide column; 132-limiting head; 133-second through hole; 134-countersunk hole; 14-first spring;

[0033] 20-base; 21-pad; 22-guide rod; 23-sliding sleeve; 24-upper die seat; 25-punch rod; 251-connecting hole; 252-second radial threaded hole; 253-second locking screw; 26-operating handle; 27-fixing rod; 28-second spring. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0035] like Figure 1 As shown, the punching device of this embodiment includes a punching machine and a filter membrane sheet punching mold.

[0036] like Figure 2 As shown, the filter membrane sheet punching die of this embodiment includes an upper die 10, a middle die and a lower die 11. In this embodiment, a cylindrical punch 101 is provided at the lower end of the upper die 10, and a connector 102 is provided on the top surface of the upper die 10. A cylindrical punching hole 111 is provided in the lower die 11 of this embodiment to cooperate with the cylindrical punch 101. The middle die of this embodiment includes a first middle die 12 and a second middle die 13, and the second middle die 13 is located below the first middle die 12.

[0037] Specifically, in this embodiment, the first middle mold 12 is fixedly sleeved outside the upper mold 10, and a first radial screw hole 121 is provided on the first middle mold 12. A first locking screw 122 for fixing the first middle mold 12 on the upper mold 10 is provided in the first radial screw hole 121. The first middle mold 12 can be fixed on the upper mold 10 by the first locking screw 122. The second middle mold 13 of this embodiment is sleeved outside the upper mold 10 and can move along the axis of the upper mold 10. Specifically, at least three guide posts 131 are evenly distributed in an annular shape on the second middle mold 13, and the guide posts 131 are parallel to the axis of the upper mold 10. The first middle mold 12 is provided with a first through hole 123 corresponding to the guide post 131, and the upper end of the guide post 131 extends through the corresponding first through hole 123, and the upper end of the guide post 131 is installed with a limit head 132 that cooperates with the first middle mold 12. Specifically, the guide column 131 of this embodiment adopts a bolt, the second middle die 13 is provided with a second through hole 133 that cooperates with the guide column 131, the lower end of the second through hole 133 is provided with a countersunk hole 134 for accommodating the bolt head, and the upper end of the guide column 131 is installed with a nut that cooperates with the first middle die 12, that is, the limit head 132 adopts a nut. When the limit head 132 cooperates with the first middle die 12, the bottom surface of the second middle die 13 is located below the bottom surface of the cylindrical punch 101 or is flush with the bottom surface of the cylindrical punch 101. In this embodiment, when the limit head 132 cooperates with the first middle die 12, the bottom surface of the second middle die 13 is located below the bottom surface of the cylindrical punch 101, so that the bottom surface of the second middle die 13 can first contact with the filter membrane, and the filter membrane is pressed and fixed, so as to ensure the success rate of the filter membrane punching and make the shape of the filter membrane sample obtained by punching regular. In this embodiment, a first spring 14 is sleeved on the guide column 131 and is located between the first middle mold 12 and the second middle mold 13. When the second middle mold 13 presses and fixes the filter membrane, the first spring 14 applies a downward elastic force to the second middle mold 13, thereby increasing the pressure applied by the second middle mold 13 on the filter membrane.

[0038] The punching machine of this embodiment includes a base 20, and the lower die 11 is installed on the base 20. In the preferred implementation of this embodiment, pads 21 are installed on the left and right sides of the base 20 respectively, and the spacing between the two pads 21 is greater than or equal to the diameter of the cylindrical punching hole 111. The lower die 11 is installed above the two pads 21, and the cylindrical punching hole 111 is located between the two pads 21. In this way, the filter membrane sample obtained by punching can directly fall between the two pads 21. In the preferred implementation of this embodiment, the spacing between the first middle die 12 and the second middle die 13 is greater than or equal to the axial length of the cylindrical punching hole 111. In this way, during the punching process, the cylindrical punch 101 can be extended to the bottom of the cylindrical punching hole 111 or even pass through the cylindrical punching hole 111, so that the filter membrane sample obtained by punching can smoothly fall between the two pads 21.

[0039] The rear end of the base 20 of this embodiment is provided with a guide rod 22 located in the vertical direction, a sliding sleeve 23 slidably matched with the guide rod 22 is provided on the guide rod 22, an upper die seat 24 fixedly connected with the guide rod 22 is provided on the sliding sleeve 23, a punching rod 25 is provided in the upper die seat 24, the punching rod 25 is located in the vertical direction and slidably matched with the upper die seat 24, the upper die 10 is fixedly mounted on the punching rod 25, and the cylindrical punch 101 is coaxial with the cylindrical punching hole 111. In this embodiment, a connector 102 is provided at the top of the upper die 10, and a connecting hole 251 matched with the connector 102 is provided at the lower end of the punching rod 25, and the connector 102 is inserted into the connecting hole 251. Specifically, a second radial threaded hole 252 is provided on the side wall of the connecting hole 251, and a second locking screw 253 for fixing the connector 102 in the connecting hole 251 is provided in the second radial threaded hole 252.

[0040] In this embodiment, an operating handle 26 for driving the punching rod 25 to move downward is installed on the upper die base 24. A fixing rod 27 located above the punching rod 25 is provided on the upper die base 24. A second spring 28 is provided between the fixing rod 27 and the punching rod 25. The second spring 28 is used to apply a vertical upward elastic force to the punching rod 25.

[0041] The punching device of this embodiment is, before use, installed the lower die on the base, the first middle die is fixedly installed on the upper die, the second middle die is installed on the first middle die through the guide column, and the first middle die can be moved along the axial direction of the upper die; the upper die is installed on the punching rod; when in use, the filter membrane is placed flat on the upper surface of the lower die, and the punching rod is driven downward by the operating handle, the lower surface of the first middle die first contacts with the filter membrane and presses and fixes the filter membrane, and the punching rod is continued to be driven downward, and the cylindrical punch penetrates the filter membrane into the cylindrical punching hole, and a circular filter membrane sample is punched out from the filter membrane by the cooperation between the cylindrical punch and the cylindrical punching hole; the operating handle is released, the punching rod is reset under the action of the second spring, and the second middle die is reset under the action of the first spring; in this way, the punching device of the utility model can not only efficiently produce circular filter membrane samples, but also the obtained filter membrane samples have regular shapes, which can ensure the repeatability of filter membrane detection.

[0042] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A filter membrane sheet punching die, characterized in that: Including upper die, middle die and lower die; A cylindrical punch is provided at the lower end of the upper die; a cylindrical punching hole matching the cylindrical punch is provided in the lower die; The middle mold includes a first middle mold and a second middle mold, and the second middle mold is located below the first middle mold; The first middle die is fixedly sleeved outside the upper die, the second middle die is sleeved outside the upper die and can move along the axis of the upper die, at least three guide posts are evenly distributed in an annular shape on the second middle die, and the guide posts are parallel to the axis of the upper die; first through holes are provided on the first middle die corresponding to the guide posts one by one, the upper ends of the guide posts extend through the corresponding first through holes, and the upper ends of the guide posts are installed with limiting heads that cooperate with the first middle die; when the limiting heads cooperate with the first middle die, the bottom surface of the second middle die is located below the bottom surface of the cylindrical punch or is flush with the bottom surface of the cylindrical punch; The guide column is sleeved with a first spring located between the first middle die and the second middle die.

2. The filter membrane sheet punching die according to claim 1, characterized in that: The guide column adopts a bolt, the second middle mold is provided with a second through hole matching with the guide column, the lower end of the second through hole is provided with a countersunk hole for accommodating the bolt head, and the upper end of the guide column is installed with a nut matching with the first middle mold.

3. The filter membrane sheet punching die according to claim 1, characterized in that: The first middle die is provided with a first radial screw hole, and the first radial screw hole is provided with a first locking screw for fixing the first middle die on the upper die.

4. The filter membrane sheet punching die according to claim 1, characterized in that: The distance between the first middle die and the second middle die is greater than or equal to the axial length of the cylindrical punching hole.

5. A punching device, characterized in that: It comprises a punching machine and a filter membrane sheet punching die as claimed in any one of claims 1 to 4; The punching machine comprises a base, and the lower die is mounted on the base; A guide rod located in the vertical direction is provided at the rear end of the base, a sliding sleeve slidably matched with the guide rod is provided on the guide rod, an upper die seat fixedly connected with the guide rod is provided on the sliding sleeve, a punching rod is provided in the upper die seat, the punching rod is located in the vertical direction and slidably matched with the upper die seat, the upper die is fixedly mounted on the punching rod, and the cylindrical punch is coaxial with the cylindrical punching hole; An operating handle for driving the punching rod to move downward is installed on the upper die seat, a fixing rod located above the punching rod is provided on the upper die seat, a second spring is provided between the fixing rod and the punching rod, and the second spring is used to apply a vertical upward elastic force to the punching rod.

6. The punching device according to claim 5, characterized in that: Pads are installed on the left and right sides of the base respectively, the distance between the two pads is greater than or equal to the diameter of the cylindrical punching hole, the lower mold is installed above the two pads, and the cylindrical punching hole is located between the two pads.

7. The punching device according to claim 6, characterized in that: The distance between the first middle die and the second middle die is greater than or equal to the axial length of the cylindrical punching hole.

8. The punching device according to claim 5, characterized in that: A connecting head is arranged on the top of the upper die, and a connecting hole matching with the connecting head is arranged on the lower end of the punching rod, and the connecting head is inserted into the connecting hole.

9. The punching device according to claim 8, characterized in that: A second radial threaded hole is provided on the side wall of the connecting hole, and a second locking screw for fixing the connecting head in the connecting hole is provided in the second radial threaded hole.

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