A cutting knife for a cutting bed and an automatic cutting bed comprising the same

Abstract

The application provides a cutting knife for a cutting bed and an automatic cutting bed comprising the same. The cutting knife for the cutting bed comprises a cutting knife body, an indicating air bag and a broken knife detection unit; a hole is formed in the inside of the cutting knife body, the opening end of the hole is located on the root end surface of the cutting knife body, and the blind end of the hole extends to a target position close to the cutting edge of the cutting knife body; the two-way air nozzle of the indicating air bag is connected with the opening end of the hole to make the indicating air bag present a first state when the cutting knife body is in an unbroken state and present a second state when the cutting knife body is in a broken state; and the broken knife detection unit is used for judging whether the cutting knife body is broken according to the current state of the indicating air bag. The automatic cutting bed comprises the above cutting knife for the cutting bed. According to the application, the problem that the existing cutting knife broken knife detection method needs to re-determine the reference range or reference value of the parameter corresponding to the external influencing factor when the parameter corresponding to the external influencing factor indicating whether the cutting knife is broken changes and is inconvenient to implement can be solved.

Description

Technical Field

[0001] This invention belongs to the field of cutting bed knife breakage detection, and more specifically, relates to a cutting knife for a cutting bed and an automatic cutting bed including the same. Background Technology

[0002] A cutting blade is a tool used on an automatic cutting machine to cut fabric. During the cutting process, blade breakage may occur due to a combination of factors, including the material and thickness of the fabric, the quality of the blade itself, and the total usage time. If the automatic cutting machine continues to cut the fabric after a blade breaks, the cutting accuracy will be affected, and the resulting fabric pieces will likely be unusable. Therefore, it is essential to monitor the cutting blade for breakage in real time during the fabric cutting process.

[0003] Existing methods for detecting broken cutting blades typically employ automated detection approaches, primarily including vibration-based, sound-recognition-based, and current-based methods. However, the parameters used in these methods to characterize whether a cutting blade has broken are not only related to the blade's inherent properties but are also affected by external factors. When these external factors change, the reference range or value for the parameters characterizing whether the cutting blade has broken needs to be redefined.

[0004] For example, a vibration analysis-based blade breakage detection method monitors the vibration amplitude of the blade in real time during fabric cutting. If the real-time vibration amplitude is outside the predetermined normal vibration amplitude range, the blade is considered broken. However, the normal vibration amplitude range is related to the thickness and material of the fabric being cut. If the thickness and / or material of the fabric changes, the normal vibration amplitude range needs to be redefined. As another example, a sound recognition-based blade breakage detection method monitors the sound signal emitted by the blade in real time during fabric cutting. If the real-time sound signal does not match the predetermined normal sound signal emitted by the blade in the unbroken state, the blade is considered broken. However, the normal sound signal emitted by the blade in the unbroken state is not only related to the thickness and material of the fabric being cut, but its sound pickup process is also affected by external noise. If the thickness and / or material of the fabric and / or the external noise environment changes, the corresponding normal sound signal needs to be redefined. For example, similar to the case of the blade breakage detection method based on vibration analysis, the parameter used in the blade breakage detection method based on current analysis to characterize whether the cutting blade is broken, namely the current value of the load motor of the automatic cutting bed, is also related to the thickness and material of the fabric being cut.

[0005] As can be seen from the above, when faced with a new knife breakage detection task due to changes in external influencing factors, it is necessary to redetermine the reference range or reference value corresponding to the parameters characterizing whether the cutting knife is broken before implementing the above-mentioned knife breakage detection methods. This makes it inconvenient to implement the above-mentioned knife breakage detection methods in the corresponding situations. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that existing methods for detecting broken cutting blades are inconvenient to implement because they require re-determining the reference range or reference value of the parameter that characterizes whether the cutting blade is broken when the external influencing factors change.

[0007] To achieve the above objectives, the present invention provides a cutting blade for a cutting bed and an automatic cutting bed including the same.

[0008] According to a first aspect of the present invention, a cutting blade for a cutting table is provided, the cutting blade for a cutting table comprising a long straight blade body, an indicator airbag having a bidirectional air nozzle, and a blade breakage detection unit;

[0009] A channel is formed inside the cutter body. The channel has an open end and a blind end. The open end is located on the root end face of the cutter body. The blind end extends to a target position near the tip of the cutter body. The cutter thickness corresponding to the target position is equal to a predetermined lower limit threshold for cutter thickness.

[0010] The bidirectional nozzle of the indicator airbag is connected to the opening end of the channel so that it presents a first state when the cutter body is in an unbroken state and a second state when the cutter body is in a broken state.

[0011] The broken blade detection unit is used to determine whether the cutter body is broken based on the current state of the indicator airbag.

[0012] Alternatively, the channel is parallel to and close to the back of the blade body.

[0013] Optionally, the cutting blade for the cutting bed also includes a connecting tube;

[0014] The two ends of the connecting tube are respectively connected to the bidirectional nozzle of the indicator airbag and the opening end of the channel.

[0015] Optionally, a first one-way air nozzle is provided on the side wall of the connecting pipe, and the first one-way air nozzle is configured to have only an air outlet function.

[0016] The first state is a contracted state, and the second state is an expanded state.

[0017] Optionally, a second one-way air nozzle is provided on the side wall of the connecting pipe, and the second one-way air nozzle is configured to have only an air intake function;

[0018] The first state is an expanded state, and the second state is a contracted state.

[0019] Optionally, the blade breakage detection unit is configured to have a fixed relative position with the blade body, and is used to determine whether the indicator airbag is changing from the first state to the second state based on the distance between itself and the indicator airbag. If so, it is determined that the blade body is broken.

[0020] Optionally, the broken blade detection unit determines whether the indicator airbag is transitioning from the first state to the second state based on its distance from the indicator airbag.

[0021] The absolute value d3 of the difference between the spacing d1 and the spacing d2 is obtained in advance. The spacing d1 is the distance between the broken knife detection unit and the indicator airbag in the first state, and the spacing d2 is the distance between the broken knife detection unit and the indicator airbag in the second state.

[0022] Obtain the absolute value d5 of the difference between the spacing d4 and the spacing d1. The spacing d4 is the real-time distance between the blade breakage detection unit and the indicator airbag during the cutting process of the blade body.

[0023] Determine whether the absolute value d5 is not less than N times the absolute value d3. If so, determine that the indicator airbag is transitioning from the first state to the second state, where 0 < N ≤ 1.

[0024] Alternatively, N = 0.2.

[0025] Optionally, the cutting blade for the cutting bed also includes a blade holder;

[0026] A mounting hole is provided on the side of the cutter body near its root, and the cutter body is mounted on the first side of the cutter holder with the blade tip facing down through the mounting hole;

[0027] The broken knife detection unit includes a ranging sensor and a processing module electrically connected to the ranging sensor;

[0028] The broken blade detection unit is disposed on the first side of the blade holder, and the measuring end of the ranging sensor is located above the indicating airbag and facing the indicating airbag.

[0029] According to a second aspect of the invention, an automatic cutting bed is provided, which includes any of the above-described cutting bed cutters.

[0030] The beneficial effects of this invention are as follows:

[0031] The cutting blade for a cutting bed of the present invention includes a cutting blade body, an indicator airbag, and a blade breakage detection unit. The indicator airbag is configured to present a first state when the cutting blade body is in an unbroken state and a second state when the cutting blade body is in a broken state. The blade breakage detection unit is configured to determine whether the cutting blade body is broken based on the current state of the indicator airbag. Therefore, the cutting blade for a cutting bed based on the present invention can achieve a corresponding automated blade breakage detection method. Furthermore, the current state of the indicator airbag used to characterize whether the cutting blade body is broken is only related to whether the cutting blade body is broken and is not affected by other factors. This effectively solves the problem that existing blade breakage detection methods require re-determining the reference range or reference value of the parameter characterizing whether the cutting blade is broken when the external influencing factors change, making implementation inconvenient.

[0032] The automatic cutting bed of the present invention and the cutting knife of the above-mentioned cutting bed belong to the same general inventive concept, and have at least the same beneficial effects as the cutting knife of the above-mentioned cutting bed, the beneficial effects of which will not be repeated here.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The present invention can be better understood by referring to the following description taken in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to denote the same or similar parts.

[0035] Figure 1 A schematic diagram showing the relative positional relationship between the cutter body, the connecting tube, and the indicator airbag according to an embodiment of the present invention is shown;

[0036] Figure 2 A schematic diagram showing the connection between the indicator airbag, the connecting tube, and the channel according to an embodiment of the present invention is shown;

[0037] Figure 3 A schematic diagram of an indicator airbag in an inflated state according to an embodiment of the present invention is shown;

[0038] Figure 4 A schematic diagram showing the relative positional relationship between the broken blade detection unit, the indicator airbag in the retracted state, and the blade holder according to an embodiment of the present invention is provided.

[0039] Figure 5 A schematic diagram showing the relative positional relationship between the broken blade detection unit, the indicator airbag in the expanded state, and the blade holder according to an embodiment of the present invention is illustrated. Detailed Implementation

[0040] To enable those skilled in the art to more fully understand the technical solutions of the present invention, exemplary embodiments of the present invention will be described more comprehensively and in detail below with reference to the accompanying drawings. Obviously, the one or more embodiments of the present invention described below are merely one or more specific ways to implement the technical solutions of the present invention, and are not exhaustive. It should be understood that other ways belonging to a general inventive concept can be used to implement the technical solutions of the present invention, and should not be limited to the embodiments described exemplary. Based on one or more embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] Example: Figure 1 This diagram illustrates the relative positions of the cutter body, the connecting tube, and the indicator airbag according to an embodiment of the present invention. Figure 2 A schematic diagram showing the connection between the indicator airbag, the connecting tube, and the channel according to an embodiment of the present invention is shown. Figure 3 A schematic diagram of the indicator airbag in its inflated state according to an embodiment of the present invention is shown. Figure 4 This diagram illustrates the relative positional relationship between the broken blade detection unit, the indicator airbag in the retracted state, and the blade holder, according to an embodiment of the present invention. Figure 5 The diagram illustrates the relative positional relationship between the broken blade detection unit, the indicator airbag in the expanded state, and the blade holder, according to an embodiment of the present invention.

[0042] Reference Figures 1-5 The cutting blade for cutting bed in this embodiment of the invention includes a long straight cutting blade body 100, an indicator airbag 200 with a two-way air nozzle, and a blade breakage detection unit 300.

[0043] A channel 110 is formed inside the cutter body 100. The channel 110 has an open end and a closed blind end. The open end of the channel 110 is located on the root end face of the cutter body 100. The blind end of the channel 110 extends to a target position near the blade tip 120 of the cutter body 100. The cutter thickness corresponding to the target position is equal to a predetermined lower limit threshold of the cutter thickness.

[0044] The bidirectional air nozzle of the indicator airbag 200 is connected to the open end of the channel 110 so that it presents a first state when the cutter body 100 is in an unbroken state and a second state when the cutter body 100 is in a broken state.

[0045] The blade breakage detection unit 300 is used to determine whether the cutter body 100 is broken based on the current state of the acquired indicator airbag 200.

[0046] Furthermore, in this embodiment of the invention, the channel 110 is parallel to and close to the back of the blade 130 of the cutting blade body 100.

[0047] Furthermore, the cutting blade for the cutting bed in this embodiment of the invention also includes a connecting tube 400;

[0048] The two ends of the connecting tube 400 are respectively connected to the bidirectional air nozzle of the indicator airbag 200 and the opening end of the channel 110.

[0049] Furthermore, in this embodiment of the invention, a first one-way air nozzle is provided on the side wall of the connecting pipe 400, and the first one-way air nozzle is configured to have only an air outlet function.

[0050] The first state of the indicator airbag 200 is the contracted state, and the second state of the indicator airbag 200 is the inflated state.

[0051] Furthermore, in this embodiment of the invention, the blade breakage detection unit 300 is configured to have a fixed relative position with the blade body 100, and is used to determine whether the indicator airbag 200 is changing from the first state to the second state based on the distance between itself and the indicator airbag 200. If so, it is determined that the blade body 100 is broken.

[0052] Furthermore, in this embodiment of the invention, the broken blade detection unit 300 determines whether the indicator airbag 200 is transitioning from a first state to a second state based on its distance from the indicator airbag 200, specifically as follows:

[0053] The absolute value d3 of the difference between the spacing d1 and the spacing d2 is obtained in advance. The spacing d1 is the distance between the broken knife detection unit 300 and the indicator airbag 200 in the first state, and the spacing d2 is the distance between the broken knife detection unit 300 and the indicator airbag 200 in the second state.

[0054] Obtain the absolute value d5 of the difference between the spacing d4 and the spacing d1. The spacing d4 is the real-time distance between the blade breakage detection unit 300 and the indicator airbag 200 used by the blade body 100 during the cutting process.

[0055] Determine if the absolute value d5 is not less than N times the absolute value d3. If so, determine if the airbag 200 is transitioning from the first state to the second state, where 0 < N ≤ 1.

[0056] Specifically, in this embodiment of the invention, N = 0.2.

[0057] Furthermore, the cutting blade for the cutting bed in this embodiment of the invention also includes a blade holder 500;

[0058] Two mounting holes 140 are provided on the side of the cutter body 100 near its root. The cutter body 100 is mounted on the first side of the cutter holder 500 with the blade tip 120 pointing downward through the two mounting holes 140.

[0059] The broken knife detection unit 300 includes a ranging sensor and a processing module electrically connected to the ranging sensor;

[0060] The broken blade detection unit 300 is disposed on the first side of the blade holder 500, and the measuring end of the measuring sensor is located above the indicating airbag 200 and facing the indicating airbag 200.

[0061] The processing module is used to determine whether the indicator airbag 200 is changing from the first state to the second state based on the ranging data sent by the ranging sensor. If so, it determines that the cutter body 100 is broken.

[0062] Specifically, in this embodiment of the invention, the ranging end of the ranging sensor refers to the end face where the ranging signal output end and the ranging signal input end of the ranging sensor are located, and the ranging sensor is an ultrasonic ranging sensor or an infrared ranging sensor.

[0063] Furthermore, the cutting blade for the cutting bed in this embodiment of the invention also includes a protective cover, which is disposed on the first side of the blade holder 500 to cover the broken blade detection unit 300 and the indicating airbag 200. The protective cover can prevent the indicating airbag 200 from being punctured by foreign objects without affecting the ranging accuracy of the ranging sensor.

[0064] The following is a more detailed description of the cutting blade for the cutting bed according to an embodiment of the present invention:

[0065] A channel 110 is formed inside the cutter body 100, parallel to the blade back 130 and spaced at a predetermined first distance from the blade back 130. The opening end of the channel 110 is located on the root end face of the cutter body 100, and the blind end of the channel 110 extends to a target position near the blade tip 120 of the cutter body 100. The cutter thickness corresponding to this target position is equal to a predetermined lower limit threshold for cutter thickness. This arrangement is to ensure that the blind end of the channel 110 is as close as possible to the blade tip 120 while ensuring that the presence of the channel 110 does not interfere with the cutter body 100's cutting process. The structural reliability of the cutter head is affected because the area of ​​the cutter head closer to the tip 120 is thinner. When the channel 110 extends into the area of ​​the cutter head that is too thin, the structural reliability of the cutter head will decrease. Therefore, a target position is set, which is the end position of the blind end extension of the channel with a thickness equal to the lower limit threshold of the cutter thickness. The reason for making the blind end of the channel 110 as close as possible to the tip 120 is to ensure that even if the breakage length of the cutter body 100 is very small, the blind end of the channel 110 can be destroyed into an open end.

[0066] The indicator airbag 200 is connected to the opening end of the channel 110 through the connecting tube 400. A first one-way air nozzle is provided on the side wall of the connecting tube 400. The first one-way air nozzle is configured to only have the function of air discharge. Before the cutter body 100 is used to cut the fabric, the first one-way air nozzle is used to perform an air extraction operation to form a certain negative pressure in the internal space of the interconnected channel 110, the connecting tube 400 and the indicator airbag 200, so that the indicator airbag 200 is in a contracted state.

[0067] If the cutter body 100 breaks during the process of cutting fabric, the interconnected internal space of the channel 110, the connecting tube 400 and the indicator airbag 200 will be connected to the external atmospheric environment and will no longer be in a negative pressure state. At this time, the air in the external atmospheric environment enters the indicator airbag 200 through the disconnected channel 110 connected to the external atmospheric environment, so that the indicator airbag 200 is in an inflated state.

[0068] The broken blade detection unit 300 is used to detect the distance between itself and the indicator airbag 200. When the cutter body 100 is in an unbroken state, the indicator airbag 200 is in a retracted state. At this time, the relative positional relationship between the broken blade detection unit 300 and the indicator airbag 200 is as follows: Figure 4 As shown, Figure 4 The dashed line represents the distance d1 between the broken blade detection unit 300 and the indicator airbag 200 in its retracted state. When the cutter body 100 is in a broken state, the indicator airbag 200 is in an inflated state. The relative positional relationship between the broken blade detection unit 300 and the indicator airbag 200 at this time is as follows: Figure 5 As shown, Figure 5 The dashed line represents the distance d2 between the blade breakage detection unit 300 and the inflated indicator airbag 200; the absolute value d3 represents the total inflation height of the indicator airbag 200; and the absolute value d5 represents the current inflation height of the indicator airbag 200. In order to achieve rapid detection of blade breakage, the blade breakage detection unit 300 is configured to determine that the blade body 100 is broken when the current inflation height of the indicator airbag 200 is 0.2 times the total inflation height of the indicator airbag 200, rather than determining that the blade body 100 is broken only when the current inflation height of the indicator airbag 200 is equal to the total inflation height of the indicator airbag 200.

[0069] As an optional implementation, the first one-way air nozzle on the side wall of the connecting pipe 400 can be replaced with a second one-way air nozzle. The second one-way air nozzle is configured to only have an air intake function and adjust the inflatability of the indicator air bag 200. Before the cutter body 100 is used to cut the fabric, the second one-way air nozzle is used to inflate the indicator air bag 200. If the cutter body 100 breaks during the cutting process, the interconnected internal space of the channel 110, the connecting pipe 400, and the indicator air bag 200 will be connected to the external atmospheric environment, the gas in the indicator air bag 200 will escape, and the indicator air bag 200 will switch to a contracted state. Accordingly, the cutter breakage detection unit 300 is configured to determine that the cutter body 100 has broken when the current contraction height of the indicator air bag 200 is 0.2 times the total contraction height of the indicator air bag 200.

[0070] Accordingly, based on the cutting blade for the cutting bed proposed in the embodiments of the present invention, the embodiments of the present invention also propose an automatic cutting bed, which includes a cutting bed body and the aforementioned cutting blade for the cutting bed.

[0071] While one or more embodiments of the present invention have been described above, those skilled in the art will recognize that the present invention can be implemented in any other form without departing from its spirit and scope. Therefore, the embodiments described above are illustrative and not restrictive, and many modifications and substitutions will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A cutting blade for a cutting table, characterized in that, It includes a long, straight cutting blade body, an indicator airbag with a two-way air nozzle, and a broken blade detection unit; A channel is formed inside the cutter body. The channel has an open end and a blind end. The open end is located on the root end face of the cutter body. The blind end extends to a target position near the tip of the cutter body. The cutter thickness corresponding to the target position is equal to a predetermined lower limit threshold for cutter thickness. The bidirectional nozzle of the indicator airbag is connected to the opening end of the channel so that it presents a first state when the cutter body is in an unbroken state and a second state when the cutter body is in a broken state. The broken blade detection unit is used to determine whether the cutting blade body is broken based on the current state of the indicator airbag. The broken blade detection unit is configured to have a fixed relative position with the cutter body, and is used to determine whether the indicator airbag is changing from the first state to the second state based on the distance between itself and the indicator airbag. If so, it is determined that the cutter body is broken. The broken blade detection unit determines whether the indicator airbag is transitioning from the first state to the second state based on its distance from the indicator airbag. Specifically, the determination is as follows: The absolute value d3 of the difference between the spacing d1 and the spacing d2 is obtained in advance. The spacing d1 is the distance between the broken knife detection unit and the indicator airbag in the first state, and the spacing d2 is the distance between the broken knife detection unit and the indicator airbag in the second state. Obtain the absolute value d5 of the difference between the spacing d4 and the spacing d1. The spacing d4 is the real-time distance between the blade breakage detection unit and the indicator airbag during the cutting process of the blade body. Determine whether the absolute value d5 is not less than N times the absolute value d3. If so, determine that the indicator airbag is transitioning from the first state to the second state, where 0 < N ≤ 1.

2. The cutting blade for a cutting bed according to claim 1, characterized in that, The channel is parallel to and close to the back of the blade body.

3. The cutting blade for a cutting bed according to claim 1, characterized in that, It also includes connecting pipes; The two ends of the connecting tube are respectively connected to the bidirectional nozzle of the indicator airbag and the opening end of the channel.

4. The cutting blade for a cutting bed according to claim 3, characterized in that, A first one-way air nozzle is provided on the side wall of the connecting pipe, and the first one-way air nozzle is configured to only have an air outlet function; The first state is a contracted state, and the second state is an expanded state.

5. The cutting blade for a cutting bed according to claim 3, characterized in that, A second one-way air nozzle is provided on the side wall of the connecting pipe, and the second one-way air nozzle is configured to have only an air intake function; The first state is an expanded state, and the second state is a contracted state.

6. The cutting blade for a cutting bed according to claim 1, characterized in that, N＝0.2。 7. The cutting blade for a cutting bed according to claim 1, characterized in that, It also includes the knife holder; A mounting hole is provided on the side of the cutter body near its root, and the cutter body is mounted on the first side of the cutter holder with the blade tip facing down through the mounting hole; The broken knife detection unit includes a ranging sensor and a processing module electrically connected to the ranging sensor; The broken blade detection unit is disposed on the first side of the blade holder, and the measuring end of the ranging sensor is located above the indicating airbag and facing the indicating airbag.

8. An automatic cutting bed, characterized in that, Includes the cutting blade for a cutting bed as described in any one of claims 1-7.

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