Drum structure and method for avoiding negative pressure air intercommunication

Abstract

A drum structure and method for avoiding negative-pressure air intercommunication, which includes a drum barrel, a toothed plate, a core shaft, a strip, and a negative-pressure air guide plate. The drum barrel is connected and sealed to the toothed plate at both ends. The core shaft passes through the drum barrel and the toothed plate. The strip is connected to the tooth grooves of the toothed plate. Three folding slits are arranged between every four strips. A set of adsorption holes is arranged on both sides of one of the folding slits in the middle of the three folding slits. The space between the core shaft and the drum barrel is divided into a negative-pressure chamber and a non-negative-pressure chamber. The adsorption holes are communicated with the negative-pressure chamber, the negative-pressure chamber is communicated with the core shaft, and the core shaft is communicated with a centrifugal fan. Each negative-pressure chamber is separately communicated with a set of adsorption holes, reducing the volume of the negative-pressure air flow passage in the drum barrel, which is beneficial to reducing the fan power and saving energy. The negative-pressure air flows in each negative-pressure chamber do not communicate with each other inside the drum barrel, and no internal turbulence is formed, reducing the external turbulence, which is beneficial to the folding of gauze sheets.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical supplies production equipment, and relates to a drum structure and method for avoiding negative pressure air intercommunication. Background Art

[0002] In medical supplies, as an efficient device for producing medical gauze, the high-speed folding machine has a complex structure and needs to be designed with different specifications and functions according to different products. It involves a kind of gauze with and without barium wire, and is also applicable to different types of gauze such as thin gauze and dense gauze. Through multiple folds of the same axis on the drum for the gauze pieces after slitting. During this process, in order to ensure the cooperation between the gauze pieces and the inserting and flipping mechanisms during the high-speed rotation of the drum to complete uninterrupted folding, a negative pressure air duct for adsorbing the gauze pieces is usually provided. Its purpose is to adsorb the other two ends of the gauze pieces during the centering folding process of the gauze pieces to avoid scattering and causing the pieces to explode. At present, the problem is that the negative pressure air duct is a shared air duct, which increases the power of the negative pressure equipment and is not energy-saving; the negative pressure airflows communicate with each other during the rotation of the drum, forming a relatively large turbulent flow inside and outside the drum, which is not conducive to the folding of the gauze pieces. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a drum structure and method for avoiding negative pressure air intercommunication. The drum is connected and sealed with the toothed plates at both ends, the core shaft passes through the drum and the toothed plates, the inlay strips are connected with the tooth grooves of the toothed plates, three folding slits are arranged between every four inlay strips, and a set of adsorption holes are arranged on both sides of one of the folding slits in the middle of the three folding slits. The space between the core shaft and the drum is divided into a negative pressure chamber and a non-negative pressure chamber. The adsorption holes are communicated with the negative pressure chamber, the negative pressure chamber is communicated with the core shaft, the core shaft is communicated with the centrifugal fan, and each negative pressure chamber is independently communicated with a set of adsorption holes, reducing the volume of the negative pressure air flow passage in the drum, which is beneficial to reducing the fan power and saving energy. The negative pressure airflows in each negative pressure chamber do not communicate with each other inside the drum, and no turbulent flow is formed inside, reducing the external turbulent flow, which is beneficial to the folding of the gauze pieces.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a drum structure for avoiding negative pressure air intercommunication, which includes a drum, toothed plates, a core shaft, inlay strips and a negative pressure air guide plate; the toothed plates are connected and sealed to both ends of the drum, the core shaft passes through the toothed plates and the drum, and a plurality of inlay strips are annularly arranged outside the drum and connected with the toothed plates; three folding slits are arranged between every four inlay strips, and a set of adsorption holes are arranged on both sides of one of the folding slits in the middle of the three folding slits; the negative pressure air guide plate is located between the drum and the inlay strips and is communicated with the adsorption holes and the drum.

[0005] The drum is a circular hollow cylinder body, and a plurality of through holes are annularly arranged on the cylinder wall.

[0006] The tooth plate is a circular flat plate with a plurality of tooth grooves arranged on the edge thereof to cooperate with the ends of the insert strips.

[0007] A group of adsorption holes on both sides of the folding gap are arranged along the axial direction of the insert strip.

[0008] The core shaft is a hollow shaft body, and a plurality of air holes are axially arranged on the surface of the shaft body and communicated with the inner cavity of the shaft body.

[0009] A plurality of partition plates are axially arranged between the inner wall of the drum and the outer wall of the core shaft to divide the internal space into a plurality of negative pressure chambers and non-negative pressure chambers, and the negative pressure chambers are connected with the negative pressure air guide plates and the inner cavity of the core shaft.

[0010] The negative pressure air guide plate is a strip plate, and a plurality of air induction holes are arranged on the upper side thereof, and the air induction holes are connected with the adsorption holes on the inlay strip and the through holes on the drum.

[0011] The upper side and the lower side of the negative pressure air guide plate are both provided with air guide grooves, and the air guide holes are located in the air guide grooves; the upper side and the lower side of the negative pressure air guide plate are respectively sealed with the inlay strip and the drum.

[0012] A avoidance groove is axially arranged on one side of the negative pressure air guide plate.

[0013] The above-mentioned method for ventilation of the drum to avoid the mutual communication of negative pressure air comprises the following steps:

[0014] S1, ventilation, one end of the core shaft is connected to a centrifugal fan or a vacuum pump and started, and the core shaft drives the drum to rotate under the drive of the high-speed folding machine; in this step, negative pressure wind is generated in the inner cavity;

[0015] S2, generating adsorption force, air enters the inner cavity from the adsorption hole, air guide groove, air inlet hole, through hole, negative pressure chamber, and air hole in sequence, generating adsorption force around the adsorption hole;

[0016] In S2, the channels of the same group of adsorption holes on both sides of the multiple folding gaps are independent of each other and do not communicate with each other, and each group of air channels rotates with the rotation of the drum;

[0017] In S2, the airflow is guided in the air guide groove and then enters each air guide hole.

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

[0019] The drum is divided into multiple negative pressure chambers and non-negative pressure chambers. The negative pressure chambers are used as air circulation channels, thereby reducing the volume of negative pressure wind flow, correspondingly reducing the fan power and saving energy consumption.

[0020] Each negative pressure chamber is individually connected to each group of adsorption holes without being connected to each other, so no turbulence is formed in the drum, thereby reducing the turbulence of the drum, facilitating the folding of the gauze pieces and improving the folding quality.

[0021] Negative pressure air guide plates are used as support between the inlay strips and the drum, which improves the overall structural strength and stability.

[0022] Air guide holes and air guide grooves are arranged on the negative pressure air guide plate to establish a connecting channel between the adsorption holes and the drum. The air guide grooves guide the incoming negative pressure airflow so that it flows evenly into each air guide hole, which is beneficial to ensure the stability of the negative pressure airflow.

[0023] An avoidance groove is provided on one side of the negative pressure air guide plate to accommodate the clamping mechanism to prevent the clamping mechanism from impacting the negative pressure air guide plate during operation, causing the negative pressure air guide plate to deviate and leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the main view.

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-section at AA.

[0028] Figure 4 It is a structural schematic diagram of the negative pressure air guide plate of the present invention.

[0029] Figure 5 It is a schematic structural diagram of the connection between the partition plate and the core shaft of the present invention.

[0030] Figure 6 for Figure 5 Schematic diagram of the main view.

[0031] In the figure: drum 1, through hole 11, tooth plate 2, core shaft 3, air hole 31, inner cavity 32, inlay strip 4, folding gap 41, adsorption hole 42, negative pressure air guide plate 5, air inlet hole 51, air guide groove 52, avoidance groove 53, partition plate 6, negative pressure bin 7, non-negative pressure bin 8. DETAILED DESCRIPTION

[0032] like Figures 1 to 6Among them, a drum structure for avoiding negative-pressure air intercommunication includes a drum barrel 1, a toothed plate 2, a core shaft 3, a strip 4, and a negative-pressure air guide plate 5; the toothed plate 2 is connected and sealed to both ends of the drum barrel 1, the core shaft 3 passes through the toothed plate 2 and the drum barrel 1, and a plurality of strips 4 are annularly arranged outside the drum barrel 1 and connected to the toothed plate 2; three folding slits 41 are arranged between every four strips 4, and a set of adsorption holes 42 are arranged on both sides of one folding slit 41 in the middle of the three folding slits 41; the negative-pressure air guide plate 5 is located between the drum barrel 1 and the strip 4 and communicates with the adsorption holes 42 and the drum barrel 1. When in use, the core shaft 3 is connected to a centrifugal fan, and each negative-pressure chamber 7 is separately connected to a set of adsorption holes 42, reducing the volume of the negative-pressure air flow passage in the drum barrel 1, which is beneficial to reducing the fan power and saving energy. The negative-pressure airflows in each negative-pressure chamber 7 do not communicate with each other inside the drum barrel 1, and no turbulent flow is formed inside, reducing the external turbulent flow, which is beneficial to the folding of the gauze pieces.

[0033] In a preferred solution, the drum barrel 1 is a circular hollow cylinder, and a plurality of through holes 11 are annularly arranged on the barrel wall. When in use, the through holes 11 on the drum barrel 1 are used for the flow of negative-pressure air.

[0034] In a preferred solution, the toothed plate 2 is a circular flat plate, and a plurality of tooth grooves are arranged on the edge to cooperate with the ends of the strips 4. During installation, after the protruding ends of the strips 4 are fitted with the tooth grooves on the edge of the toothed plate 2, the strips 4 are limited, and then fasteners are passed through the ends and connected and fixed to the toothed plate 2.

[0035] Preferably, every four strips 4 form a group, and a folding slit 41 is formed between every two strips 4, so that three folding slits 41 are formed between the four strips 4.

[0036] Preferably, a set of adsorption holes 42 are arranged on both sides of one folding slit 41 in the middle of each group of strips 4, and each set of adsorption holes 42 is two rows of holes, and the two rows of holes are close to the edge of the folding slit 41.

[0037] Preferably, the folding knife of the folding mechanism is located in the folding slit 41. The folding mechanism is not shown in the figure.

[0038] In a preferred solution, a set of adsorption holes 42 on both sides of the folding slit 41 are all arranged along the axial direction of the strip 4. When in use, a set of adsorption holes 42 are two rows, distributed on both sides of the folding slit 41, and adsorb the gauze pieces during the folding process.

[0039] In a preferred solution, the core shaft 3 is a hollow shaft body, and a plurality of air holes 31 are axially arranged on the surface of the shaft body and communicate with the inner cavity 32 of the shaft body. When in use, one end of the core shaft 3 is connected to a centrifugal fan or a vacuum pump, and the air in the core shaft 3 is sucked during the working process, so as to form a negative pressure in the inner cavity 32, and the air holes 31 are used for the flow of negative-pressure air.

[0040] In a preferred embodiment, a plurality of partition plates 6 are axially arranged between the inner wall of the drum barrel 1 and the outer wall of the mandrel 3, dividing the space inside into a plurality of negative pressure chambers 7 and non-negative pressure chambers 8. The negative pressure chambers 7 are communicated with the negative pressure air guide plate 5 and the inner cavity 32 of the mandrel 3. During use, the partition plates 6 divide the drum barrel 1 into negative pressure chambers 7 and non-negative pressure chambers 8. The non-negative pressure chambers 8 are in a closed state, and the negative pressure chambers 7 are used for air circulation, thereby reducing the volume of the circulation channel, correspondingly reducing the fan power and saving energy. Secondly, the negative pressure air in each negative pressure chamber 7 does not flow to each other, and no turbulent flow is formed in the drum barrel 1, thereby reducing the turbulent flow around the adsorption holes 42 outside the drum barrel 1.

[0041] In a preferred embodiment, the negative pressure air guide plate 5 is a strip-shaped plate, and a plurality of through air holes 51 are arranged on the upper side surface. The air holes 51 are communicated with the adsorption holes 42 on the insert strip 4 and the through holes 11 on the drum barrel 1. During use, the air holes 51 of the negative pressure air guide plate 5 are used to communicate the negative pressure air flow between the adsorption holes 42 and the drum barrel 1.

[0042] In a preferred embodiment, air guide grooves 52 are arranged on both the upper side surface and the lower side surface of the negative pressure air guide plate 5, and the air holes 51 are located in the air guide grooves 52; the upper side surface and the lower side surface of the negative pressure air guide plate 5 are respectively matched and sealed with the insert strip 4 and the drum barrel 1. During use, the negative pressure air guide plate 5 contacts and is matched and sealed with the lower side surface of the insert strip 4 and the outer wall surface of the drum barrel 1, forming a supporting effect on the insert strip 4 and improving the overall structural strength. Secondly, the adsorption holes 42 on the insert strip 4 and the through holes 11 on the drum barrel 1 are respectively communicated with the air guide grooves 52. After the negative pressure air flow enters the air guide grooves 52, it is drained through the air guide grooves 52 and introduced into each adsorption hole 42 and through hole 11 respectively, which is beneficial to the stability of the air flow and the constancy of the air pressure of multiple holes.

[0043] In a preferred embodiment, an avoidance groove 53 is axially arranged on one side of the negative pressure air guide plate 5. During installation, the shaft body and the clamping knife part of the folding mechanism are located between two negative pressure air guide plates 5. The avoidance groove 53 is beneficial to increasing the installation space and avoiding collision with the negative pressure air guide plate 5 when the folding mechanism operates.

[0044] In a preferred embodiment, for the ventilation method of the rotating drum that avoids the intercommunication of negative pressure air as described above, it includes the following steps:

[0045] S1, ventilation: One end of the mandrel is communicated with a centrifugal fan or a vacuum pump and started. The mandrel drives the drum barrel to rotate under the drive of the high-speed folding machine; in this step, negative pressure air is generated in the inner cavity.

[0046] S2, generating adsorption force: Air sequentially enters the inner cavity from the adsorption holes, air guide grooves, air holes, through holes, negative pressure chambers, and air holes, generating an adsorption force around the adsorption holes.

[0047] In S2, the channels of the same group of adsorption holes on both sides of multiple folding slits are all independent of each other and do not communicate with each other, and each group of air channels rotates as the drum rotates;

[0048] In S2, the air flow is guided in the air guide groove and then enters each air inlet hole.

[0049] The above method establishes a communication channel between the adsorption holes and the drum, and also lies in that the air guide groove guides the inflowing negative pressure air flow so that it evenly flows into each air inlet hole, which is beneficial to ensuring the stability of the negative pressure air flow.

[0050] 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 in this application and the features in the embodiments 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 drum structure for avoiding the intercommunication of negative-pressure air, characterized in that: It includes a drum cylinder (1), a toothed plate (2), a mandrel (3), a strip (4) and a negative pressure air guide plate (5); the toothed plate (2) is connected and sealed to both ends of the drum cylinder (1), the mandrel (3) passes through the toothed plate (2) and the drum cylinder (1), and a plurality of strips (4) are annularly arranged outside the drum cylinder (1) and connected to the toothed plate (2); three folding slits (41) are arranged between every four strips (4), and a group of adsorption holes (42) are arranged on both sides of one folding slit (41) in the middle of the three folding slits (41); the negative pressure air guide plate (5) is located between the drum cylinder (1) and the strip (4) and communicates with the adsorption holes (42) and the drum cylinder (1). The mandrel (3) is a hollow shaft body, and a plurality of air holes (31) are axially arranged on the surface of the shaft body and communicate with the inner cavity (32) of the shaft body. A plurality of partition plates (6) are axially arranged between the inner wall of the drum cylinder (1) and the outer wall of the mandrel (3), dividing the space inside into a plurality of negative pressure chambers (7) and non-negative pressure chambers (8), and the negative pressure chambers (7) communicate with the negative pressure air guide plate (5) and the inner cavity (32) of the mandrel (3). The negative pressure air guide plate (5) is a strip-shaped plate, and a plurality of through air holes (51) are arranged on the upper side surface, and the through air holes (51) communicate with the adsorption holes (42) on the strip (4) and the through holes (11) on the drum cylinder (1).

2. The drum structure for avoiding negative-pressure air intercommunication according to claim 1, characterized in that: The drum cylinder (1) is a circular hollow cylinder body, and a plurality of through holes (11) are annularly arranged on the cylinder wall.

3. The drum structure for avoiding the intercommunication of negative-pressure air according to claim 1, wherein: The toothed plate (2) is a circular flat plate, and a plurality of tooth grooves are arranged on the edge and are connected in cooperation with the ends of the strips (4).

4. The drum structure for avoiding the intercommunication of negative-pressure air according to claim 1, characterized in that: A group of adsorption holes (42) on both sides of the folding slit (41) are all arranged along the axial direction of the strip (4).

5. The drum structure for avoiding the intercommunication of negative-pressure air according to claim 1, wherein: The upper side surface and the lower side surface of the negative pressure air guide plate (5) are both provided with air guide grooves (52), and the through air holes (51) are located in the air guide grooves (52); the upper side surface and the lower side surface of the negative pressure air guide plate (5) are respectively in sealing cooperation with the strip (4) and the drum cylinder (1).

6. The drum structure for avoiding the intercommunication of negative-pressure air according to claim 1, characterized in that: A relief groove (53) is axially arranged on one side of the negative pressure air guide plate (5).

7. The ventilation method of the drum for avoiding negative pressure air intercommunication according to any one of claims 1 to 6, characterized in that, It includes the following steps: S1, ventilation, one end of the mandrel (3) is connected to a centrifugal fan or a vacuum pump and started, and the mandrel (3) drives the drum cylinder (1) to rotate under the drive of a high-speed folding machine; in this step, negative pressure air is generated in the inner cavity (32). S2, generating an adsorption force, air sequentially enters the inner cavity (32) from the adsorption holes (42), the air guide grooves (52), the through air holes (51), the through holes (11), the negative pressure chambers (7), and the air holes (31), and an adsorption force is generated around the adsorption holes (42). In S2, the channels of the same group of adsorption holes (42) on both sides of the plurality of folding slits (41) are all independent of each other and do not communicate with each other, and each group of air channels rotates as the drum cylinder (1) rotates. In S2, the air flow is guided in the air guide grooves (52) and then enters each through air hole (51).

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