Cutter device with abnormal undercutting protection function

Abstract

The utility model relates to the field of cone yarn packaging equipment, in particular to a cutter device with an abnormal undercutting protection function. Comprising a three-way valve and a pilot-operated one-way valve, an air inlet of the three-way valve is communicated with one working port of the two-position five-way electromagnetic valve, and an air inlet of the pilot-operated type one-way valve is communicated with the other working port of the two-position five-way electromagnetic valve; one air outlet of the three-way valve is communicated with an upper port of the air cylinder, and the other air outlet of the three-way valve is communicated with a pilot port of the pilot-operated type one-way valve; and an air outlet of the pilot-operated type one-way valve is communicated with a lower port of the air cylinder. The device is simple to operate, is stable and reliable, does not occupy operation space, reduces the cost, and improves the efficiency and the safety at the same time.

Description

Technical Field

[0001] This utility model relates to the field of yarn packaging equipment, specifically to a cutting device with abnormal cutting protection. Background Technology

[0002] As textile mills demand increasingly higher levels of automation, the need for automated yarn packaging equipment is growing. During the yarn packaging process, individual yarn packages need to be wrapped in plastic film, requiring the use of a hot-cutting blade to melt and seal the film. Some manufacturers use rolls of woven bags for packaging entire bundles of yarn, which also necessitates the use of a hot-cutting blade to cut the rolls to the correct length. While the use of hot-cutting blades brings convenience and efficiency to rapid packaging, it also introduces significant risks.

[0003] Existing cutting devices generally have a relatively simple structure, mainly including an air source, a stop valve, a two-position five-way solenoid valve, a cylinder, and a hot cutting blade, such as... Figure 1 As shown in the diagram, the state depicted is when the solenoid valve is de-energized and pneumatically supplied. When the solenoid valve is energized, the two-position five-way solenoid valve switches its path, and the cylinder extends to push the cutter downwards to perform the cutting action, as shown. Figure 2 As shown. When the solenoid valve is de-energized, the two-position five-way solenoid valve switches its path again, the cylinder retracts, and the cutter is lifted, as shown. Figure 1 As shown. When the solenoid valve loses its air supply due to factors such as the valve being shut off or the air supply being stopped, the cutter will move downwards to its lower limit position under the influence of gravity, regardless of whether the solenoid valve is energized or de-energized. If the solenoid valve suddenly loses its air supply or suddenly becomes energized during manual intervention, the cutter will cut downwards, leading to a tragedy.

[0004] When replacing plastic film and woven bags (hereinafter collectively referred to as consumables) or addressing abnormalities in related areas after use, human intervention is required. To improve efficiency, equipment is generally designed to be relatively compact, meaning the operator is not far from the hot-cutting blade. To prevent the blade from making abnormal cuts and causing injury during consumable replacement or equipment maintenance, mechanical limit devices are commonly used. However, in some cases, the installation and operation of mechanical limit devices are relatively complex and occupy limited operating space. Some operators, out of a sense of complacency, neglect to install additional mechanical limit devices, ultimately leading to safety accidents and tragedies. Utility Model Content

[0005] This utility model provides a cutting device with abnormal downward cutting protection. Its purpose is to solve the safety risks caused by abnormal downward cutting of the hot cutting knife when replacing consumables or handling abnormalities by designing an anti-fall pneumatic circuit including components such as a three-way valve and a pilot-operated one-way valve.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] This utility model provides a cutting device with abnormal downward cutting protection, including a three-way valve and a pilot-operated one-way valve; the air inlet of the three-way valve is connected to one working port of a two-position five-way solenoid valve, and the air inlet of the pilot-operated one-way valve is connected to the other working port of the two-position five-way solenoid valve; one air outlet of the three-way valve is connected to the upper port of a cylinder, and the other air outlet is connected to the pilot port of the pilot-operated one-way valve; the air outlet of the pilot-operated one-way valve is connected to the lower port of the cylinder.

[0008] Furthermore, it also includes the air source, valve, cylinder, and hot cutting blade.

[0009] Furthermore, the air inlet of the plug is connected to the air source, and the air outlet is connected to the air inlet of the two-position five-way solenoid valve.

[0010] Furthermore, the hot cutting blade is fixed to the end of the piston rod of the cylinder.

[0011] The beneficial effects achieved by this utility model are as follows:

[0012] This invention uses a simple pneumatic structure design to prevent the hot cutting blade from cutting downwards, eliminating the need for additional mechanical limiting devices. This ensures that the hot cutting blade will not cut abnormally and cause injury to workers when changing consumables or repairing equipment. It is simple to operate, stable and reliable, does not occupy operating space, and improves efficiency and safety while reducing costs. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the existing cutting device.

[0015] Figure 2 This is a schematic diagram of the energized and ventilated state of the existing cutting device.

[0016] Figure 3 This is a schematic diagram of the overall structure of this utility model; the state shown in the figure is the state of the two-position five-way solenoid valve when it is de-energized and pneumatic, which is the initial position.

[0017] Figure 4 This is a schematic diagram of the energized and ventilated state of this utility model.

[0018] Figure 5 This is a schematic diagram of the power outage and gas cutoff state of this utility model.

[0019] Figure 6 This is a schematic diagram of the power supply and gas supply states of this utility model.

[0020] Figure 7 This is a schematic diagram comparing the existing cutting device with the present invention in different states.

[0021] In the diagram, 1 is the air source; 2 is the plug valve; 3 is the two-position five-way solenoid valve; 4 is the three-way valve; 5 is the pilot-operated check valve; 6 is the cylinder; and 7 is the hot cutting knife. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] Existing cutting devices generally have a simple structure and lack safety protection. During maintenance, if the two-position five-way solenoid valve 3 suddenly loses its air supply or the solenoid valve suddenly becomes energized, the cutter will cut downwards, leading to a tragedy. To avoid the above situation, this utility model provides a cutting device with abnormal downward cutting protection to improve the existing cutting device.

[0026] like Figures 3-6 As shown, the cutting device includes an air source 1, a plug valve 2, a two-position five-way solenoid valve 3, a three-way valve 4, a pilot-operated one-way valve 5, a cylinder 6, and a hot cutting blade 7. One end of the plug valve 2 is connected to the air source 1, and the other end is connected to the air inlet of the two-position five-way solenoid valve 3. One working port of the two-position five-way solenoid valve 3 is connected to the air inlet of the three-way valve 4, and the other working port is connected to the air inlet of the pilot-operated one-way valve 5. One air outlet of the three-way valve 4 is connected to the upper port of the cylinder 6, and the other air outlet is connected to the pilot port of the pilot-operated one-way valve 5. The air outlet of the pilot-operated one-way valve 5 is connected to the lower port of the cylinder 6. The hot cutting blade 7 is fixed to the end of the piston rod of the cylinder 6.

[0027] The valve 2 is existing technology. By selecting a model with an exhaust port, the rear exhaust function can be realized.

[0028] The two-position five-way solenoid valve 3 is a basic automated component used to control fluids. Its structure mainly includes two parts: a valve body and a control valve core. The valve body shell of the two-position five-way solenoid valve 3 has through holes at different positions. These holes are connected to five air pipe interfaces, namely A, B, R, P and S. Among them, P is the air inlet, A and B are working ports (usually connected to cylinder 6), and R and S are exhaust ports (which can also be used as spare ports or connected to a muffler).

[0029] The pilot-operated check valve 5 is a common fluid control element that allows fluid to flow in only one direction and completely closes it in the opposite direction. The pilot-operated check valve 5 consists of a main valve (valve body, valve core, spring, etc.) and a pilot valve; however, unlike ordinary check valves, the pilot valve can control the opening and closing of the main valve, thus enabling the pilot-operated check valve 5 to have the function of reverse fluid flow.

[0030] Specifically, during normal operation, the two-position five-way solenoid valve 3 is always in the air-venting state. When the two-position five-way solenoid valve 3 is energized, its circuit switches. Compressed air passes through the three-way valve 4 and enters the pilot port of the pilot-operated one-way valve 5 and the upper part of the cylinder 6. After the pilot port of the pilot-operated one-way valve 5 is vented, the pilot-operated one-way valve 5 opens. Compressed air at the lower port of the cylinder 6 flows back through the pilot-operated one-way valve 5 and is discharged to the atmosphere from the exhaust port of the two-position five-way solenoid valve 3. After the upper part of the cylinder 6 is vented, the compressed air pushes the cylinder 6 downward to cause the cutter to cut downward. Figure 4As shown. When the two-position five-way solenoid valve 3 is de-energized, the circuit of the two-position five-way solenoid valve 3 is switched again. The compressed air at the upper end of the cylinder 6 is discharged to the atmosphere through the exhaust port of the two-position five-way solenoid valve 3. The compressed air enters the lower end of the cylinder 6 through the pilot-operated one-way valve 5. The cylinder 6 retracts, causing the cutter to lift.

[0031] When manual intervention is required, the two-position five-way solenoid valve 3 is in the initial position with no power and air supply. At this time, the plug valve 2 is closed, and the compressed air downstream of the plug valve 2 and upstream of the pilot-operated check valve 5 is discharged to the atmosphere through the vent port of the plug valve 2. The compressed air at the lower end of cylinder 6 cannot be discharged under the action of the pilot-operated check valve 5, and the cutter cannot cut downwards due to the compressed air at the lower end of cylinder 6. Figure 5 As shown. At this time, the solenoid valve is energized, and the two-position five-way solenoid valve 3 switches its path. Since the plug valve 2 is in the closed state, the pilot port of the pilot-operated check valve 5 and the upper end of the cylinder 6 are both connected to the atmosphere. Compressed air is not introduced into the pilot port of the pilot-operated check valve 5, so the pilot-operated check valve 5 is still in the closed state. The compressed air at the lower end of the cylinder 6 still cannot be discharged, and the cutter still cannot cut down under the action of the compressed air at the lower end of the cylinder 6. Figure 6 As shown.

[0032] In other words, when human intervention occurs, for safety reasons, closing the stop valve 2 at the initial position (i.e., before the cutter has fallen) will prevent the cutter from falling. Regardless of any subsequent actions of the two-position five-way solenoid valve 3, it will not cause any abnormal downward cutting action of the cutter, thus ensuring personnel safety. The entire process only requires rotating one stop valve 2, without the need for additional mechanical limit devices, making the operation simple and reliable.

[0033] The two-position five-way solenoid valve 3, under different states, compares the different states of this utility model with the original structure of the cutting device (i.e., the prior art). Figure 7 As shown. It is worth noting that, since the energization / de-energization and gas supply of the two-position five-way solenoid valve 3 can only occur sequentially and not simultaneously, based on this principle, the possible variations are shown in Table 1:

[0034] Table 1 is a state change table for a two-position five-way solenoid valve.

[0035] Before transformation After transformation Before transformation After transformation 1 Power failure ventilation 2 Power failure and gas outage A 4. Power supply and ventilation 1 Power failure ventilation 1 Power failure ventilation 4. Power supply and ventilation 4. Power supply and ventilation 5. Power supply interrupted, gas supply interrupted (B) 2 Power failure and gas outage A 1 Power failure ventilation 5. Power supply interrupted, gas supply interrupted (B) 4. Power supply and ventilation 2 Power failure and gas outage A 3. Power on, gas off A 5. Power supply interrupted, gas supply interrupted (B) 6 Power outage and gas failure B 3. Power on, gas off A 2 Power failure and gas outage A 6 Power outage and gas failure B 1 Power failure ventilation 3. Power on, gas off A 4. Power supply and ventilation 6 Power outage and gas failure B 5. Power supply interrupted, gas supply interrupted (B)

[0036] States 1 and 4 represent normal operation, while state 1 is the initial position. States 2 and 3 are obtained by sequentially cutting off and restoring power from state 1 (power off and gas on), and states 5 and 6 are obtained by sequentially cutting off and power off from state 4 (power on and gas on). During normal operation, personnel are not allowed to approach the site. When manual intervention is required, the stopper 2 is closed in state 1 (initial position). This invention ensures that the cutter remains in the initial position and will not cut downwards. The original structure would cut downwards under gravity, posing a significant safety hazard. To ensure the cutter does not cut downwards, a mechanical limiting device must be added.

[0037] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A cutting device with abnormal downward cutting protection, characterized in that: It includes a three-way valve (4) and a pilot-operated check valve (5); the air inlet of the three-way valve (4) is connected to one working port of a two-position five-way solenoid valve (3), and the air inlet of the pilot-operated check valve (5) is connected to the other working port of the two-position five-way solenoid valve (3); one air outlet of the three-way valve (4) is connected to the upper port of the cylinder (6), and the other air outlet is connected to the pilot port of the pilot-operated check valve (5); the air outlet of the pilot-operated check valve (5) is connected to the lower port of the cylinder (6).

2. The cutting device with abnormal downward cutting protection according to claim 1, characterized in that: It also includes an air source (1), a plug (2), a cylinder (6), and a hot cutting blade (7).

3. A cutting device with abnormal downward cutting protection according to claim 2, characterized in that: The air inlet of the plug (2) is connected to the air source (1), and the air outlet is connected to the air inlet of the two-position five-way solenoid valve (3).

4. A cutting device with abnormal downward cutting protection according to claim 2, characterized in that: The hot cutting blade (7) is fixed to the end of the piston rod of the cylinder (6).

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