Bottom cutter roller and method for preventing gauze pieces from fraying

Abstract

A bottom knife roller and method for preventing gauze sheets from fraying. It includes a roller body, a bottom knife, knife insertion holes, a negative pressure window, and an anti-fraying wire mesh. By arranging the bottom knife and the knife insertion holes on the surface of the roller body, the bottom knife and the knife insertion holes are symmetrically arranged with respect to two intersecting centerlines of the cross-section of the roller body respectively. The negative pressure window is located on the surface of the roller body between the bottom knife and the knife insertion holes and close to the bottom knife. The negative pressure holes and the negative pressure window on the surface of the roller body are communicated with the negative pressure cavity inside the roller body, forming an adsorption force on the surface of the roller body to adsorb the gauze sheet. The adsorption force of the negative pressure window is much greater than the adsorption force of the rest of the surface area of the roller body. During the process of the bottom knife roller transferring the gauze sheet and the knife inserting the gauze sheet into the gap of the rotary drum, only the end of one end of the gauze sheet can be pulled, avoiding fraying at both ends of the gauze sheet.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical supplies production equipment, and relates to a bottom knife roll and method for preventing gauze sheets from fraying. Background Art

[0002] Among medical supplies, there is a barium thread gauze used during surgery. In its preparation process, a folding machine is used to fold the gauze multiple times. Before folding, the barium thread is transferred onto the gauze and attached to it. The transfer of the gauze is through a transfer roll, and the barium thread is pulled onto the gauze and attached to it as a whole. After the gauze is cut into gauze sheets, it is then folded. Currently, in the process of transferring the gauze sheets after cutting by the folding machine, the main problem is that during the cutting process, a bottom knife roll and a cutting knife roll are used for traction. After the gauze is cut into gauze sheets, the gauze sheets are inserted into the gaps of the rotating drum for folding and transfer by an inserting knife mechanism when the bottom knife roll is rotating at a high speed. During this process, the two ends of the gauze sheet are easily pulled, resulting in fraying at the ends of the gauze sheet. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a bottom knife roll and method for preventing gauze sheets from fraying. By arranging a bottom knife and inserting knife holes on the surface of the roll body, the bottom knife and the inserting knife holes are symmetrically arranged with respect to two intersecting centerlines of the cross-section of the roll body. The negative pressure window is located on the surface of the roll body between the bottom knife and the inserting knife holes and close to the bottom knife. The roll surface negative pressure holes and the negative pressure window on the surface of the roll body are connected to the negative pressure cavity inside the roll body, forming an adsorption force on the surface of the roll body to adsorb the gauze sheet. The adsorption force of the negative pressure window is much greater than the adsorption force of the rest of the surface area of the roll body. During the process of the bottom knife roll transferring the gauze sheet and the inserting knife inserting the gauze sheet into the gap of the rotating drum, only one end of the gauze sheet can be pulled, avoiding fraying at both ends of the gauze sheet.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a bottom knife roll for preventing gauze sheets from fraying, which includes a roll body, a bottom knife, inserting knife holes, a negative pressure window, and an anti-fraying wire mesh; the bottom knife and the inserting knife holes are arranged on the surface of the roll body. Two groups of bottom knives and two groups of inserting knife holes are symmetrically arranged with respect to two intersecting centerlines of the cross-section of the roll body. The negative pressure window is located between the bottom knife and the inserting knife holes, close to the bottom knife and connected to the negative pressure cavity of the roll body, and the anti-fraying wire mesh covers the negative pressure window.

[0005] A negative pressure cavity is axially arranged along the center of the roll body, and the hollow shaft heads at both ends of the roll body are connected to the negative pressure cavity.

[0006] The roll surface negative pressure holes on the surface of the roll body are connected to the negative pressure cavity. A plurality of roll surface negative pressure holes are arranged in a ring and distributed along the axial direction of the roll body; the roll surface negative pressure holes are circular holes.

[0007] The bottom knife is located in a recessed bottom knife groove on the surface of the roll body, and the contact surface of the bottom knife is an arc surface.

[0008] The inserted knife hole includes a notch communicated with a circular shaft hole, and the notch penetrates through the surface of the roller body.

[0009] The negative pressure window is a concave rectangular window, and a plurality of negative pressure holes inside the window and anti-drawing holes are arranged inside the rectangular window and communicated with the negative pressure cavity.

[0010] The negative pressure holes inside the window are circular holes; the anti-drawing holes are rectangular holes, and the rectangular holes are arranged along the axial direction of the roller body and are close to one side of the bottom knife.

[0011] The anti-drawing wire net is a carborundum net with an arc-shaped structure, which is cooperatively closed with the negative pressure window, and its outer arc surface is on the same plane as the outer wall surface of the roller body.

[0012] The sum of the hole areas of the negative pressure holes inside the window in the negative pressure window is smaller than the hole area of the anti-drawing holes, and the mesh distribution rate of the anti-drawing wire net is much larger than the distribution rate of the negative pressure holes inside the window in the negative pressure window.

[0013] The anti-drawing method of the bottom knife roller for preventing the gauze piece from drawing as described above includes the following steps:

[0014] S1. Traction: The bottom knife roller and the cutting knife roller rotate in opposite directions, the inserted knife mechanism rotates synchronously with the bottom knife roller, the cutting knife rotates synchronously with the cutting knife roller, and the gauze is pulled across the cutting positions of the bottom knife roller and the cutting knife roller; in this step, the bottom knife roller is communicated with a centrifugal fan so that a negative pressure is formed in the negative pressure cavity inside it.

[0015] S2. Adsorption: The gauze after passing through the cutting position is adsorbed by the negative pressure window and the negative pressure holes on the roller surface of the bottom knife roller, and passes over the inserted knife on the inserted knife mechanism.

[0016] S3. Slitting: The cutting knife on the cutting knife roller abuts against the bottom knife on the bottom knife roller to cut the gauze, and a gauze piece is formed after cutting.

[0017] S4. Transfer: During the continuous rotation of the bottom knife roller, the inserted knife of the inserted knife mechanism inserts the gauze piece into the gap of the rotary drum; during this process, one end of the gauze piece is firmly adsorbed on the anti-drawing wire net by the adsorption force generated by the negative pressure window, and the other end of the gauze piece is adsorbed by the negative pressure holes on the roller surface, and its adsorption force is smaller than the adsorption force at the negative pressure window end. During the process of the inserted knife of the inserted knife mechanism pushing the gauze piece into the gap of the rotary drum, only the end with weaker adsorption force of the gauze piece can be pulled, so as to avoid drawing of both ends of the gauze piece.

[0018] The main beneficial effects of the present invention are as follows:

[0019] The negative pressure holes on the roller surface and the negative pressure window provided on the roller body are communicated with the negative pressure cavity, and the negative pressure cavity is communicated with the centrifugal fan, so that an adsorption force is generated on the roller surface and acts on the gauze piece.

[0020] The negative pressure holes and anti-drawing holes arranged inside the negative pressure window are communicated with the negative pressure cavity. The anti-drawing wire mesh covers the negative pressure window. The sum of the hole areas of the negative pressure holes inside the window is smaller than the hole area of the anti-drawing holes. The mesh hole distribution rate of the anti-drawing wire mesh is much larger than the distribution rate of the negative pressure holes inside the negative pressure window, so that the adsorption force in the negative pressure window area is much greater than that in the other areas.

[0021] When the inserting knife inserts the gauze piece into the gap of the drum, one end of the gauze piece is firmly adsorbed by the anti-drawing wire mesh, and there are relatively more adsorption points per unit area. When the inserting knife pushes the gauze piece into the drum gap, it can only pull the end of the gauze piece with a weaker adsorption force, thus avoiding wire drawing at both ends of the gauze piece. Brief Description of the Drawings

[0022] The present invention will be further described below in conjunction with the drawings and embodiments:

[0023] Figure 1 It is a schematic structural diagram of the present invention.

[0024] Figure 2 is Figure 1 the front view schematic diagram of.

[0025] Figure 3 It is the front view schematic diagram of the roller body of the present invention.

[0026] Figure 4 is Figure 3 the sectional view taken along line A-A of.

[0027] Figure 5 It is the front view schematic diagram of the anti-drawing wire mesh of the present invention.

[0028] Figure 6 It is the state diagram of the gauze piece adsorbed by the present invention.

[0029] In the figure: roller body 1, negative pressure cavity 11, hollow shaft head 12, negative pressure holes on the roller surface 13, bottom knife groove 14, bottom knife 2, contact surface 21, inserting knife hole 3, circular shaft hole 31, notch 32, negative pressure window 4, negative pressure holes inside the window 41, anti-drawing holes 42, anti-drawing wire mesh 5. Detailed Embodiment

[0030] Such as Figures 1 to 6Among them, a bottom knife roller for preventing gauze sheets from fraying includes a roller body 1, a bottom knife 2, knife insertion holes 3, a negative pressure window 4, and an anti-fraying wire mesh 5. The bottom knife 2 and the knife insertion holes 3 are arranged on the surface of the roller body 1. Two groups of bottom knives 2 and two groups of knife insertion holes 3 are symmetrically arranged with respect to two intersecting centerlines of the cross-section of the roller body 1. The negative pressure window 4 is located between the bottom knife 2 and the knife insertion holes 3, close to the bottom knife 2 and communicated with the negative pressure cavity 11 of the roller body 1. The anti-fraying wire mesh 5 covers the negative pressure window 4. When in use, an adsorption force is formed on the surface of the roller to adsorb the gauze sheet. The adsorption force of the negative pressure window 4 is much greater than the adsorption force of the rest of the area on the surface of the roller body. During the process of the bottom knife roller transferring the gauze sheet and the insertion knife inserting the gauze sheet into the gap of the drum, only the end of one end of the gauze sheet can be pulled, avoiding fraying at both ends of the gauze sheet.

[0031] In a preferred solution, a negative pressure cavity 11 is axially arranged along the center of the roller body 1, and the hollow shaft heads 12 at both ends of the roller body 1 are communicated with the negative pressure cavity 11. When in use, the hollow shaft heads 12 are connected to a centrifugal fan, and the suction force generated during operation causes a negative pressure in the negative pressure cavity 11.

[0032] In a preferred solution, the roller surface negative pressure holes 13 on the surface of the roller body 1 are communicated with the negative pressure cavity 11. A plurality of roller surface negative pressure holes 13 are arranged in a ring and distributed along the axial direction of the roller body 1. The roller surface negative pressure holes 13 are circular holes. When in use, the roller surface negative pressure holes 13 are communicated with the negative pressure cavity 11, so as to generate an adsorption force on the surface of the roller body 1.

[0033] In a preferred solution, the bottom knife 2 is located in a recessed bottom knife groove 14 on the surface of the roller body 1, and the contact surface 21 of the bottom knife 2 is an arc surface. When in use, the bottom knife 2 is installed in the bottom knife groove 14, and the contact surface 21 of the bottom knife 2 contacts the cutter on the cutter roller to cut the gauze clamped between the two.

[0034] In a preferred solution, the knife insertion hole 3 includes a notch 32 communicated with a circular shaft hole 31. The notch 32 penetrates through the surface of the roller body 1. When in use, the bearing and the shaft body of the knife insertion mechanism are installed in the circular shaft hole 31 of the knife insertion hole 3, and the insertion knife of the knife insertion mechanism extends out of the notch 32. During the process of the gauze sheet being transferred from the bottom knife roller to the drum, the insertion knife pushes the gauze sheet into the gap of the drum. During this process, the insertion knife deflects slightly in the notch 32, and the notch 32 limits the swing amplitude of the insertion knife.

[0035] In a preferred solution, the negative pressure window 4 is a concave rectangular window, and a plurality of inner window negative pressure holes 41 and anti-fraying holes 42 are arranged in the rectangular window and communicated with the negative pressure cavity 11. When in use, the inner window negative pressure holes 41 and the anti-fraying holes 42 are communicated with the negative pressure cavity 11, so that an adsorption force acts on the gauze sheet in the area of the negative pressure window 4.

[0036] In a preferred embodiment, the negative pressure holes 41 inside the window are circular holes; the anti-threading holes 42 are rectangular holes, which are arranged along the axial direction of the roller body 1 and are close to one side of the bottom knife 2. During use, the anti-threading holes 42 are close to the bottom knife 2, the cutting point of the gauze is located in the area of the bottom knife 2, and the anti-threading holes 42 are rectangular holes, and the negative pressure air volume thereof is relatively large, so that the adsorption force at the gauze cutting position is relatively large.

[0037] In a preferred embodiment, the anti-threading wire mesh 5 is a corundum mesh with an arc-shaped structure, which cooperates with the negative pressure window 4 to be closed, and its outer arc surface is on the same plane as the outer wall surface of the roller body 1. During use, after the anti-threading wire mesh 5 and the negative pressure window 4 are fixedly combined, their outer arc surfaces are on the same arc surface as the outer wall surface of the roller body 1, so as to avoid the collapse of the gauze sheet when adsorbed here.

[0038] In a preferred embodiment, the sum of the hole areas of the negative pressure holes 41 inside the negative pressure window 4 is smaller than the hole area of the anti-threading holes 42, and the mesh distribution rate of the anti-threading wire mesh 5 is much larger than the distribution rate of the negative pressure holes 41 inside the negative pressure window 4. During use, the air volume per unit area in the area of the negative pressure window 4 is larger than the air volume per unit area in the remaining areas of the roller body 1, and the air volume in the area of the anti-threading holes 42 inside the negative pressure window 4 is larger than the air volume in the area of the negative pressure holes 41 inside the window; the anti-threading wire mesh 5 is a corundum wire mesh with dense mesh holes, and the aperture of its mesh holes is much smaller than the aperture of the negative pressure holes 13 on the roller surface, so that the adsorption force per unit area of the anti-threading wire mesh 5 is much larger than the adsorption force of the area of the negative pressure holes 13 on the roller surface. Therefore, during the process of the insertion knife swinging or pushing the gauze sheet, only the end with a weaker adsorption force of the gauze sheet can be pulled, thus avoiding the phenomenon of wire drawing at both ends of the gauze sheet. The reason is that the corundum mesh holes are very fine and the gauze cannot enter the holes.

[0039] In a preferred embodiment, the anti-threading method of the bottom knife roller for preventing the gauze sheet from wire drawing is as described above, and it includes the following steps:

[0040] S1, traction: the bottom knife roller and the cutting knife roller rotate in opposite directions, the insertion knife mechanism rotates synchronously with the bottom knife roller, the cutting knife rotates synchronously with the cutting knife roller, and the gauze is pulled across the cutting positions of the bottom knife roller and the cutting knife roller; in this step, the bottom knife roller is connected to the centrifugal fan so that the negative pressure cavity 11 inside it forms a negative pressure;

[0041] S2, adsorption: the gauze after passing through the cutting position is adsorbed by the negative pressure window 4 and the negative pressure holes 13 on the bottom knife roller, and passes over the insertion knife on the insertion knife mechanism;

[0042] S3, slitting: the cutting knife on the cutting knife roller abuts against the bottom knife 2 on the bottom knife roller to cut the gauze, and a gauze sheet is formed after cutting;

[0043] S4. Transfer. During the continuous rotation of the bottom knife roller, the inserting knife of the inserting knife mechanism inserts the gauze piece into the gap of the rotary drum. During this process, one end of the gauze piece is firmly adsorbed on the anti-drawing wire mesh 5 by the adsorption force generated by the negative pressure window 4, and the other end of the gauze piece is adsorbed by the negative pressure holes 13 on the roller surface. The adsorption force of the other end is less than that of the negative pressure window 4. During the process of the inserting knife of the inserting knife mechanism pushing the gauze piece into the gap of the rotary drum, only the end with weaker adsorption force of the gauze piece can be pulled, thus avoiding wire drawing at both ends of the gauze piece.

[0044] The above method generates negative pressure inside the bottom knife roller and acts on the gauze piece on the roller surface. The negative pressure window 4 firmly adsorbs the gauze piece to make it closely adhere to the anti-drawing wire mesh 5, while the adsorption force of the other end of the gauze piece is relatively weak. During the process of the inserting knife swinging or pushing the gauze piece into the rotary drum, only one end of the gauze piece can be pulled, thus avoiding wire drawing of the gauze piece.

[0045] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The embodiments and features in the embodiments in this application can be arbitrarily combined with each other without conflict. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A bottom cutter roller for preventing gauze sheets from fraying, characterized in that: It comprises a roller body (1), a bottom knife (2), a knife insertion hole (3), a negative pressure window (4) and an anti-snagging mesh (5); the bottom knife (2) and the knife insertion hole (3) are arranged on the surface of the roller body (1); two groups of bottom knives (2) and two groups of knife insertion holes (3) are symmetrically arranged along two intersecting center lines of the cross section of the roller body (1); the negative pressure window (4) is located between the bottom knife (2) and the knife insertion hole (3), close to the bottom knife (2) and connected to the negative pressure chamber (11) of the roller body (1); and the anti-snagging mesh (5) covers the negative pressure window (4); A negative pressure chamber (11) is arranged in the center of the roller body (1) along the axial direction, and hollow shaft heads (12) at both ends of the roller body (1) are in communication with the negative pressure chamber (11); The roller surface negative pressure holes (13) on the surface of the roller body (1) are connected to the negative pressure cavity (11), and the plurality of roller surface negative pressure holes (13) are arranged in a ring shape and distributed along the axial direction of the roller body (1); The negative pressure window (4) is a concave rectangular window, and a plurality of negative pressure holes (41) and anti-threading holes (42) are arranged in the rectangular window and communicate with the negative pressure chamber (11); The sum of the hole areas of the negative pressure holes (41) in the negative pressure window (4) is smaller than the hole area of ​​the anti-snagging holes (42), and the mesh distribution rate of the anti-snagging mesh (5) is much larger than the distribution rate of the negative pressure holes (41) in the negative pressure window (4).

2. The bottom cutter roller for preventing the gauze piece from being drawn into filaments according to claim 1, wherein: The roller surface negative pressure hole (13) is a circular hole.

3. The bottom cutter roller for preventing the gauze piece from being drawn into filaments according to claim 1, wherein: The bottom knife (2) is located in a bottom knife groove (14) recessed in the surface of the roller body (1), and the contact surface (21) of the bottom knife (2) is an arc-shaped surface.

4. The bottom cutter roller for preventing the gauze piece from fraying according to claim 1, wherein: The inserting hole (3) comprises a notch (32) connected to the circular shaft hole (31), and the notch (32) penetrates the surface of the roller body (1).

5. The bottom cutter roller for preventing the gauze sheet from being drawn into filaments according to claim 1, wherein: The negative pressure hole (41) in the window is a circular hole; the anti-snagging hole (42) is a rectangular hole, and the rectangular hole is arranged along the axial direction of the roller body (1) and close to one side of the bottom knife (2).

6. The bottom cutter roller for preventing the gauze sheet from fraying according to claim 1, characterized in that: The anti-snagging mesh (5) is a diamond abrasive mesh with an arc-shaped structure, which is closed in cooperation with the negative pressure window (4), and its outer arc surface is located on the same plane as the outer wall surface of the roller body (1).

7. The anti-threading method of the bottom knife roller for preventing the gauze piece from threading, according to any one of claims 1 to 6, is characterized in that It includes the following steps: S1, traction, the bottom knife roller and the cutting knife roller rotate in opposite directions, the inserting knife mechanism rotates synchronously with the bottom knife roller, the cutting knife rotates synchronously with the cutting knife roller, and the gauze is pulled to pass the tangent point between the bottom knife roller and the cutting knife roller; in this step, the bottom knife roller is connected to the centrifugal fan to form a negative pressure in the negative pressure chamber (11) inside it; S2, adsorption, the gauze passing the cutting point is adsorbed by the negative pressure window (4) and the roller surface negative pressure hole (13) on the bottom knife roller, and passes over the inserting knife on the inserting knife mechanism; S3, slitting, the cutting knife on the cutting knife roller collides with the bottom knife (2) on the bottom knife roller to cut the gauze, and the gauze pieces are formed after cutting; S4, transfer, during the process of the bottom knife roller continuing to rotate, the knife of the knife inserting mechanism inserts the gauze piece into the gap of the rotating drum; during this process, one end of the gauze piece is firmly adsorbed on the anti-thread-snagging net (5) by the adsorption force generated by the negative pressure window (4), and the other end of the gauze piece is adsorbed by the negative pressure hole (13) on the roller surface, and its adsorption force is smaller than the adsorption force of one end of the negative pressure window (4). During the process of the knife of the knife inserting mechanism pushing the gauze piece into the gap of the rotating drum, only the end of the gauze piece with weaker adsorption force can be pulled, thereby preventing the two ends of the gauze piece from being threaded.

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