Film cutter

Abstract

The invention discloses a membrane cutter, and belongs to the technical field of air filter membrane cutting. The film cutter comprises a base, a plurality of fences and a circular base plate, the center position of the base is provided with a vertically-arranged central axis, a plurality of sliding grooves are distributed in the base in a circular array mode with the central axis as the center, the bottoms of the fences are slidably connected to the corresponding sliding grooves, and the side, close to the central axis, of each fence is provided with a first groove; sliding adjusting parts are connected to the fences so that the fences can slide on the corresponding sliding grooves, the diameter of the circular base plate is equal to the diameter of a filter membrane needing to be cut, and the sum of the thickness of the circular base plate and the thickness of the filter membrane is matched with the distance between the upper wall and the lower wall of the first groove so that the circular base plate and the outer edge of the filter membrane on the circular base plate can be clamped in the first grooves. The membrane cutter disclosed by the invention can be used for conveniently fixing and cutting filter membranes with different diameters.

Description

Technical Field

[0001] The invention relates to the technical field of air filter membrane cutting, in particular to a membrane cutter. Background Art

[0002] At present, in the process of air monitoring, particulate matter is generally collected by filter membrane. The most commonly used filter membranes for collecting atmospheric particulate matter are mainly divided into Teflon, quartz, polypropylene, glass fiber and other forms according to the material.

[0003] As the number of air monitoring projects increases, air filters require different areas of filter membranes and different pre-treatment methods, such as acid extraction, alkali extraction, ultrasonic extraction, etc.; and due to the sampling principle of the sampler, the closer the sample membrane is to the center of the circle, the greater the sampling volume per unit area. In order to ensure consistent segmentation area and uniform concentration, the sample membrane should be cut in a fan-shaped manner. This requires the filter membrane to be evenly segmented, and the remaining filter membrane can be relatively intact and can be used to detect other projects.

[0004] At present, when cutting filter membranes in actual work, since the filter membranes are thin and fragile, the filter membranes will shake during the cutting process, which can easily cause the particles adsorbed on the filter membranes to fall off, affecting the accuracy of the test results. Therefore, the filter membranes need to be fixed. However, the prior art often requires preparing multiple membrane cutters of different specifications to fix and cut filter membranes of corresponding diameters for filter membranes of different diameters. After cutting a filter membrane of one diameter, it is necessary to replace a membrane cutter of another specification to fix and cut a filter membrane of another diameter. The operation process is complicated and the execution efficiency is low. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems in the prior art and to provide a membrane cutter which can easily fix and cut filter membranes of different diameters.

[0006] The film cutter provided by the present invention comprises:

[0007] A base having a vertically arranged central axis, wherein a plurality of slide grooves are distributed in a circular array with the central axis as the center on the base, and the slide grooves are arranged along the radial direction of a circle with the central axis as the center;

[0008] A plurality of fences, corresponding to the slide grooves one by one, the bottom of the fences are slidably connected to the corresponding slide grooves, a first groove is provided on one side of each fence close to the central axis, and a sliding adjustment part is connected to each fence to enable the fence to slide on the corresponding slide groove;

[0009] The diameter of the circular pad is equal to the diameter of the filter membrane to be cut, and the sum of the thickness of the circular pad and the filter membrane is adapted to the distance between the upper and lower walls of the first groove, so that the circular pad and the outer edge of the filter membrane on the circular pad can be engaged in each first groove.

[0010] Preferably, the base is connected to the top of a support seat, the sliding adjustment part corresponds to the fence and the slide groove one by one, and the sliding adjustment part includes:

[0011] A self-locking knob is mounted on the support seat and is located at the bottom center of the base, and the rotation center of the self-locking knob is colinear with the central axis;

[0012] A plurality of first pull wires, corresponding to the fences one by one, one end of the first pull wire being connected to the rotating part of the self-locking knob, and the other end being connected to the corresponding fence;

[0013] A plurality of first springs correspond to the fences one by one. The first springs are arranged along the length direction of the corresponding slide slots and are connected between the corresponding fences and the base.

[0014] Preferably, the sum of the thickness of the circular pad and the filter membrane is less than the distance between the upper and lower walls of the first groove, and the fences are connected with fixing components, and the fixing components correspond to the fences one by one, and the fixing components include:

[0015] A fixed needle is vertically slidably connected to the corresponding fence, and the bottom end of the fixed needle can be inserted into the first groove;

[0016] A second spring is sleeved on the fixing needle, and its two ends are respectively connected to the fence and the fixing needle;

[0017] Self-locking button, installed on the fence;

[0018] The second pull wire is connected between the movable part of the self-locking button and the top end of the fixing needle.

[0019] Preferably, the number of the fences is an even number.

[0020] Preferably, the fence includes a fence base and two clamping blocks, each fence base is slidably connected in a corresponding slide groove, the two clamping blocks are connected to the top of the corresponding fence base, and are symmetrically arranged on both sides of the corresponding slide groove along the radial direction, and the first groove is arranged on one side of each clamping block close to the central axis.

[0021] Preferably, the width of one end of the slide groove close to the central axis gradually decreases, and the shape of one end of the fence base close to the central axis is adapted to the shape of one end of the slide groove close to the central axis.

[0022] Preferably, the end of the slide groove away from the central axis is open, the end of the fence base away from the central axis extends out from the corresponding slide groove, and the bottom of the fence base away from the central axis is provided with a supporting leg, and the top of each supporting leg is hinged to the corresponding fence base through a hinge.

[0023] Preferably, a limiting boss is provided in the middle of the top surface of the base, and a limiting groove is provided on the bottom surface of the circular pad. The limiting boss and the limiting groove are plug-in connected so that the center line of the circular pad is colinear with the central axis through the cooperation of the limiting boss and the limiting groove.

[0024] Preferably, the limiting boss is circular.

[0025] Preferably, the circular pad is provided with a plurality of second grooves, and the second grooves are distributed on the outer edge of the top surface of the circular pad in a circular array centered on the central axis.

[0026] Compared with the prior art, the present invention has at least the following advantages:

[0027] The membrane cutter of the present invention can place filter membranes of different diameters through circular pads of different diameters, and can clamp circular pads of different diameters through the first grooves on each fence by adjusting the radial position of the fence, and a limiting groove for limiting the filter membrane thereon can be formed between the upper wall of the first groove and the top surface of the circular pad, so that the filter membranes of different diameters can be kept from moving during the cutting process, so as to avoid the filter membrane from shaking during the cutting process, so that the particles on the filter membrane can be prevented from falling off and affecting the accuracy of the detection result;

[0028] At the same time, after the filter membrane is cut, the filter membrane can be easily removed from the circular pad to avoid the filter membrane from being broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the overall structure of the present invention without placing a filter membrane.

[0031] Figure 3 It is a schematic diagram of the overall structure of the present invention without the circular pad installed.

[0032] Figure 4 It is a schematic diagram of the overall structure of the base of the present invention after horizontal sectioning.

[0033] Figure 5 It is a schematic diagram of the connection structure of the self-locking knob of the present invention when it is in a locked state.

[0034] Figure 6 It is a schematic diagram of the connection structure of the self-locking knob of the present invention when it is in the unlocked state.

[0035] Figure 7 This is a schematic diagram of the connection structure of the fence and the self-locking button of the present invention;

[0036] Figure 8 A is a schematic diagram of a partially enlarged structure of the present invention;

[0037] Fig. 9 It is a partial enlarged structural schematic diagram B of the present invention;

[0038] Fig.10 It is a partial enlarged structural schematic diagram C of the present invention;

[0039] Fig.11 It is a structural schematic diagram of a circular pad of the present invention;

[0040] Fig.12 This is a schematic diagram of a first connection structure of a fence and a support leg of the present invention;

[0041] Fig.13 This is a schematic diagram of a second connection structure of the fence and the support legs of the present invention;

[0042] Fig.14 It is a schematic structural diagram of the cutting knife of the present invention.

[0043] Description of reference numerals:

[0044] 1. Base, 2. Round pad, 3. Cutting knife, 4. Limiting boss, 6. Slide groove, 8. Fence base, 9. Protrusion, 10. First groove, 12. Second groove, 13. Limiting groove, 14. First pull wire, 15. First spring, 16. Fixed needle, 17. Second spring, 18. Sliding groove, 181. Sliding block, 1811. Special-shaped groove, 182. Pressing rod, 183. Fourth spring, 184. Articulated rod, 19. Second pull wire, 20. Support seat, 201. Support column, 202. Fixed gear, 203. Drive sleeve, 2031. Meshing teeth, 204. Rotating sleeve, 205. Gasket, 206. Third spring, 21. Support leg, 22. Clamp, 23. Filter membrane, 81. Fixed column. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1 to Figure 14 , the specific implementation of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] The membrane cutter provided by the present invention includes a base 1, a plurality of fences and a circular pad 2. The base 1 has a vertically arranged central axis. A plurality of slide grooves 6 are distributed in a circular array centered on the central axis in the base 1. Specifically, the slide grooves 6 can be sixteen, eight or four, etc., and are sixteen in the present embodiment. The slide grooves 6 are arranged radially along a circle centered on the central axis. The fences correspond to the slide grooves 6 one by one, and the bottom of the fences is slidably connected to the corresponding slide grooves 6. A first groove 10 is provided on one side of each fence close to the central axis, and a sliding adjustment part is connected to the fences so that the fences can slide on the corresponding slide grooves 6. The diameter of the circular pad 2 is equal to the diameter of the filter membrane 23 to be cut, and the sum of the thickness of the circular pad 2 and the filter membrane 23 is adapted to the distance between the upper and lower walls of the first groove 10, so that the outer edge of the circular pad 2 and the filter membrane 23 on the circular pad 2 can be engaged in each first groove 10.

[0047] Directions:

[0048] Select a circular pad 2 that is consistent with the diameter of the filter membrane. It is only necessary to align the outer edge of the filter membrane 23 with the outer edge of the circular pad 2, and then place the circular pad 2 and the filter membrane 23 on its upper surface at the center of the base 1. The fence is slid toward the central axis on the corresponding slide groove 6 through the sliding adjustment part, so that the first groove 10 on each fence is engaged with the circular pad 2 and the outer edge of the filter membrane 23 on the circular pad 2, thereby achieving stable clamping of the circular pad 2 and the filter membrane 23, so that the filter membrane 23 does not move during the cutting process, and the filter membrane 23 is prevented from shaking during the cutting process, so that the particles on the filter membrane 23 are prevented from falling off and affecting the detection result. The accuracy of the result; put the filter membrane 23 on the circular pad 2, find the diagonal line, and cut downward through the center of the circle with a cutting knife 3. The first cut is to divide it into two equal parts, or it can be divided into four equal parts, eight equal parts, or even sixteen equal parts. After the cutting of the filter membrane 23 is completed, the fence is slid on the corresponding slide groove 6 to the side away from the central axis through the sliding adjustment part, so that the circular pad 2 and the filter membrane 23 are released from the clamping. After removing the circular pad 2 from the base 1, the operator can lightly lift the circular pad 2 to his eyes, so as to remove the divided filter membranes 23 one by one from the circular pad 2 at a close distance to avoid the filter membrane 23 from being broken.

[0049] As a preferred embodiment, the base 1 is connected to the top of a support base 20, a support column 201 is fixed to the top of the support base 20, the bottom center of the base 1 is fixedly connected to the top of the support column 201, the sliding adjustment part corresponds to the fence and the slide groove 6 one by one, the sliding adjustment part includes a self-locking knob, a plurality of first pull wires 14 and a plurality of first springs 15, the self-locking knob includes a fixed gear 202, the fixed gear 202 is sleeved and fixedly connected to the top of the support column 201, the rotating part of the self-locking knob includes a driving sleeve 203 and a rotating sleeve 204, the driving sleeve 203 is sleeved on the support column 201, and the top inner wall of the driving sleeve 203 is provided with meshing teeth 2031, so as to be able to It is sleeved on the outside of the fixed gear 202 and meshed with the fixed gear 202, the rotating sleeve 204 is sleeved on the outside of the driving sleeve 203 and is slidably connected to the driving sleeve 203 along the axial direction, the top of the rotating sleeve 204 is also rotatably connected to the bottom of the base 1, and the bottom of the driving sleeve 203 is coaxially provided with a gasket 205, the gasket 205 is sleeved on the rotating connection support column 201, and is also rotatably connected to the driving sleeve 203, the bottom of the gasket 205 is also connected to a third spring 206 set outside the support column 201, the third spring 206 is a compression spring, and the bottom end of the third spring 206 is also fixedly connected to the top of the support seat 20, and multiple first pull wires 14 correspond to the fences one by one. One end of the first pull wire 14 is connected to the outside of the rotating sleeve 204 of the self-locking knob, and the other end is connected to the corresponding fence. Multiple first springs 15 correspond to the fences one by one. The first spring 15 is arranged along the length direction of the corresponding slide groove 6 and is connected between the corresponding fence and the base 1. By rotating the self-locking knob forward, all the first pull wires 14 can be wound around the rotating part of the self-locking knob, so that the first pull wire 14 pulls the corresponding fence and slides toward the central axis at the same time to clamp the circular pad 2. The first spring 15 is deformed, and the self-locking knob is rotated in the reverse direction to disengage the first pull wire 14 from the rotating part of the self-locking knob. The first spring 15 restores its deformation, causing the fence to move away from the central axis. Slide on one side to loosen the clamping of the circular pad 2; by pulling the drive sleeve 203 downward and compressing the third spring 206, the meshing teeth 2031 are disengaged from the fixed gear 202, and the drive sleeve 203 can be rotated freely, thereby driving the rotating sleeve 204 to rotate, and then pulling the first pull wire 14, loosening the drive sleeve 203, and the third spring 206 recovers its deformation and elongates, pushing the rotating sleeve 204 upward, so that the meshing teeth 2031 are engaged with the fixed gear 202, and the rotating sleeve 204 is locked and cannot rotate. The above technical solution can be used to synchronously adjust the positions of all fences at the same time, which is beneficial to improving the stability of the clamping of the circular pad 2 and the filter membrane 23.

[0050] As a preferred embodiment, the sum of the thicknesses of the circular pad 2 and the filter membrane is less than the distance between the upper and lower walls of the first groove 10, and the fences are connected with fixing components, which correspond to the fences one by one. The fixing components include a fixing needle 16, a second spring 17, a self-locking button and a second pull wire 19. The fixing needle 16 is vertically slidably connected to the corresponding fence, and the bottom end of the fixing needle 16 can be inserted into the first groove 10. The second spring 17 is sleeved on the fixing needle 16, and its two ends are respectively connected to the fence and the fixing needle 16. The self-locking button is installed on the fence, and the second pull wire 19 is connected between the movable part of the self-locking button and the top of the fixing needle 16. The movable part of the self-locking button is configured into two position states, including a first position state and a second position state. In the first position state, the movable part of the self-locking button pulls the second pull wire 19, so that the second pull wire 19 pulls the fixing needle 16 to slide upward and deform the second spring 17. In the second position state The movable part of the self-locking button releases the second pull wire 19, the second spring 17 recovers its deformation, and drives the fixed pin 16 to slide downward. Specifically, the end of the fence away from the central axis is provided with a sliding groove 18, the movable part of the self-locking button includes a sliding block 181, a pressing rod 182, a fourth spring 183 and a hinge rod 184, the sliding block 181 is slidably connected to the sliding groove 18, the pressing rod 182 penetrates from the outside into the sliding groove 18 and is fixedly connected to the sliding block 181, and the second pull wire 19 is restored to its original shape and drives the fixed pin 16 to slide downward. Specifically, the end of the fence away from the central axis is provided with a sliding groove 18, and the movable part of the self-locking button includes a sliding block 181, a pressing rod 182, a fourth spring 183 and a hinge rod 184, the sliding block 181 is slidably connected to the sliding groove 18, and the pressing rod 182 penetrates from the outside into the sliding groove 18 and is fixedly connected to the sliding block 181. The fourth spring 183 is connected to the pressing rod 182, and is arranged along the depth direction of the sliding groove 18, and its two ends are respectively connected to the bottom of the sliding groove 18 and the sliding block 181. The sliding block 181 is provided with an annular special-shaped groove 1811. One end of the hinge rod 184 is hinged to the bottom of the sliding groove 18, and the other end is slidably connected to the special-shaped groove 1811. When the user presses the pressing rod 182, the end of the hinge rod 184 can move between a and b of the special-shaped groove 1811, such as Fig. 9 As shown, the movable part of the self-locking button at a is in the first position state, and the movable part of the self-locking button at b is in the second position state. In this way, the bottom end of the fixing needle 16 can be against the filter membrane 23, which can further fix the filter membrane 23 and the circular pad 2.

[0051] As a preferred embodiment, the number of fences is even. In this way, when cutting the filter membrane 23, the fences can be used to guide the cutting knife 3, and the filter membrane can be accurately cut into two, four, or eight equal parts. Since the filter membrane 23 is stably clamped, the integrity of the remaining filter membrane 23 can be avoided from being damaged, and the need to measure multiple projects with one filter membrane can be met.

[0052] As a preferred embodiment, the fence includes a fence base 8 and two clamping blocks 22, each fence base 8 is slidably connected to the corresponding slide groove 6, the first pull wire 14 is fixedly connected to the corresponding first spring 15 connected between the corresponding fence base 8 and the base 1, one end of the first pull wire 14 is provided with a ring, and is connected to the fixed column 81 fixedly set on the side of the fence base 8 through the ring, and the other end is connected to the rotating sleeve 204, the two clamping blocks 22 are connected to the top of the corresponding fence base 8, and are symmetrically arranged along the radial direction of the corresponding slide groove 6. On both sides, the first groove 10 is arranged on one side of each clamping block 22 close to the central axis. When cutting the filter membrane 23, the blade of the cutting knife 3 is inserted between the two clamping blocks 22 of the fence symmetrically arranged on both sides of the central axis, which can accurately guide the blade of the cutting knife 3 to avoid cutting deviation; and specifically, the first groove 10 on each clamping block 22 is connected to a fixing component. When cutting, the filter membrane 23 on both sides of the blade of the cutting knife 3 is fixed by the fixing needle 16, thereby further avoiding the integrity of the remaining filter membrane 23 from being damaged during cutting.

[0053] As a preferred embodiment, the width of one end of the slide groove 6 close to the central axis gradually decreases, and the shape of one end of the fence base 8 close to the central axis is adapted to the end of the slide groove 6 close to the central axis. In this way, the fence base 8 can have a longer sliding distance in the slide groove 6, thereby being able to adapt to the clamping of a larger range of circular pads 2 and filter membranes 23.

[0054] As a preferred embodiment, the end of the slide groove 6 away from the central axis is open, and the end of the fence base 8 away from the central axis extends out from the corresponding slide groove 6. A protrusion 9 is integrally formed at the bottom of the end of the fence base 8 close to the central axis, and the protrusion 9 is slidably connected to the bottom or top of the slide groove 6 to prevent the fence base 8 from sliding out of the slide groove 6. Specifically, the two ends of the first spring 15 are respectively fixedly connected between the corresponding protrusion 9 and the base 1, and the end of the bottom of the fence base 8 away from the central axis is provided with a support leg 21, and the top of each support leg 21 is hinged to the corresponding fence base 8 through a hinge. The hinge of each support leg 21 has a certain damping so that the bottom end of each support leg 21 can remain in a folded state close to the central axis, which can reduce the occupied space in normal times. When cutting is required, the support leg 21 is rotated to make the support leg 21 vertical, which can play a supporting role, avoid shaking during cutting, and improve stability.

[0055] As a preferred method, a limiting boss 4 is provided in the middle of the top surface of the base 1, and a limiting groove 13 is provided on the bottom surface of the circular pad 2. The limiting boss 4 is plugged into the limiting groove 13 so that the center line of the circular pad 2 is colinear with the central axis through the cooperation between the limiting boss 4 and the limiting groove 13. In this way, the circular pad 2 can be quickly and conveniently placed in the center position of the base 1, which is convenient for subsequent clamping and fixing.

[0056] As a preferred embodiment, the limiting boss 4 is circular, which is convenient for placing the circular pad 2.

[0057] As a preferred embodiment, a plurality of second grooves 12 are provided on the circular pad 2. The second grooves 12 are distributed in a circular array on the outer edge of the top surface of the circular pad 2 with the central axis as the center. After the cutting of the filter membrane 23 is completed, the front end of one arm of the tweezers can be extended into the second groove 12, and the front end of the other arm is located on the filter membrane 23, so that the filter membrane 23 can be quickly and accurately removed from the circular pad 2, so that the filter membrane is not easily broken or the particles on the filter membrane are not affected.

[0058] In the description of the present invention, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A film cutter, characterized in that: include: A base (1) has a central axis arranged vertically at its center, and a plurality of slide grooves (6) are arranged in a circular array on the base (1) with the central axis as the center, and the slide grooves (6) are arranged along the radial direction of a circle with the central axis as the center; A plurality of fences corresponding to the slide grooves (6) one by one, the bottom of each fence being slidably connected to the corresponding slide groove (6), a first groove (10) being provided on one side of each fence close to the central axis, and a sliding adjustment portion being connected to each fence so that the fence can slide on the corresponding slide groove (6); The circular pad (2) has a diameter equal to the diameter of the filter membrane (23) to be cut, and the sum of the thicknesses of the circular pad (2) and the filter membrane (23) is adapted to the distance between the upper and lower walls of the first groove (10), so that the circular pad (2) and the outer edge of the filter membrane (23) on the circular pad (2) can be engaged in each first groove (10).

2. The film cutter according to claim 1, characterized in that The base (1) is connected to the top of a support seat (20), the sliding adjustment part corresponds to the fence and the slide groove (6) one by one, and the sliding adjustment part includes: A self-locking knob is mounted on the support seat (20) and is located at the bottom center of the base (1), and the rotation center of the self-locking knob is colinear with the central axis; A plurality of first pull wires (14) corresponding one to each of the fences, one end of the first pull wire (14) being connected to the rotating portion of the self-locking knob, and the other end being connected to the corresponding fence; A plurality of first springs (15) correspond one to one with the fences. The first springs (15) are arranged along the length direction of the corresponding slide groove (6) and are connected between the corresponding fence and the base (1).

3. The film cutter according to claim 1, characterized in that The sum of the thickness of the circular pad (2) and the filter membrane is smaller than the distance between the upper and lower walls of the first groove (10), and the fences are connected with fixing components, and the fixing components correspond to the fences one by one, and the fixing components include: A fixing needle (16) is vertically slidably connected to the corresponding fence, and the bottom end of the fixing needle (16) can be inserted into the first groove (10); A second spring (17) is sleeved on the fixing needle (16), and its two ends are respectively connected to the fence and the fixing needle (16); Self-locking button, installed on the fence; The second pull wire (19) is connected between the movable part of the self-locking button and the top end of the fixing needle (16).

4. The film cutter according to claim 1, characterized in that The number of the fences is even.

5. The film cutter according to claim 4, characterized in that The fence comprises a fence base (8) and two clamping blocks (22), each fence base (8) is slidably connected in a corresponding slide groove (6), the two clamping blocks (22) are connected to the top of the corresponding fence base (8), and are symmetrically arranged on both sides of the corresponding slide groove (6) along the radial direction, and the first groove (10) is arranged on one side of each clamping block (22) close to the central axis.

6. The film cutter according to claim 5, characterized in that The width of one end of the slide groove (6) close to the central axis gradually decreases, and the shape of one end of the fence base (8) close to the central axis is adapted to the shape of one end of the slide groove (6) close to the central axis.

7. The film cutter according to claim 6, characterized in that The end of the slide groove (6) away from the central axis is open, the end of the fence base (8) away from the central axis extends out from the corresponding slide groove (6), and the bottom end of the fence base (8) away from the central axis is provided with a support leg (21), and the top end of each support leg (21) is hinged to the corresponding fence base (8) through a hinge.

8. The film cutter according to claim 1, characterized in that A limiting boss (4) is provided in the middle of the top surface of the base (1), and a limiting groove (13) is provided on the bottom surface of the circular pad (2). The limiting boss (4) and the limiting groove (13) are plugged and connected, so that the center line of the circular pad (2) is collinear with the center axis through the cooperation between the limiting boss (4) and the limiting groove (13).

9. The film cutter according to claim 8, characterized in that The limiting boss (4) is circular.

10. The film cutter according to claim 1, characterized in that The circular pad (2) is provided with a plurality of second grooves (12), and the second grooves (12) are distributed in a circular array on the outer edge of the top surface of the circular pad (2) with the central axis as the center.

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