PVC pipe fixed-length cutting equipment with overheating early warning function

Abstract

The application discloses PVC pipe fixed-length cutting equipment with overheating early warning function and relates to the technical field of pipe cutting. The PVC pipe is quantitatively cut by using the structure of a hot cutter. The hot cutter is powered to generate a hot cutting temperature sufficient to melt the PVC pipe, and the hot cutting is performed in the direction from top to bottom. In the process, the hot cutting pressure in the hot cutting process is calculated according to the physical properties of the PVC pipe, and the display value on the tension sensor is combined. The essence is that the tension sensor directly feeds back the resistance borne in the hot cutting action, so as to reflect the direct influence of the hot cutting temperature on the melting-cutting process of the PVC pipe again. Specifically, the smaller the resistance is under the over-temperature state; the greater the resistance is under the temperature deficiency state; and the effect of monitoring the overall operation state is achieved in combination with the specific state.

Description

Technical Field

[0001] This invention relates to the field of pipe cutting technology, specifically to a PVC pipe length cutting device with an overheat warning function. Background Technology

[0002] For the processing of PVC pipes, it is necessary to cut them into fixed lengths according to production requirements. Because the traditional sawing method (toothed disc) can cause cracks at the cut of the pipe, and the cutting process may consume some of the pipe material, the current cutting method is mainly thermal cutting. The process is to heat the hot wire or hot blade to a certain temperature and then use the heated hot wire or hot blade to complete the cutting process. The cut is smooth and the cutting loss is low.

[0003] However, in practice, if the temperature of the hot wire or hot knife is too high, it will cause the cut of the pipe to soften too much and deform abnormally. If the temperature of the hot wire or hot knife is too low, it will be difficult to stabilize the cutting process. Furthermore, the movement of the hot wire or hot knife will also cause the cut of the PVC pipe to soften insufficiently, resulting in abnormal conditions such as cracks, stringing, and gaps on the cut surface after cutting.

[0004] In addition, the cutting quality of the pipe is related to the movement (speed) of the hot wire or hot knife. Under the required temperature conditions, if the movement speed is too slow, it can be reflected as: the contact time between the hot wire or hot knife and the pipe cutting position is too long, which will also cause over-softening and abnormal deformation. Under high temperature conditions, the degree of deformation is greater. Conversely, if there is a speed difference in the movement process, problems such as cracks and gaps will appear at the cutting position.

[0005] Therefore, this application proposes a solution. Summary of the Invention

[0006] The purpose of this invention is to provide a PVC pipe length cutting device with an overheat warning function, which solves the problem that the difference in temperature and movement mode directly affects the overall cut surface quality when using thermal cutting to cut PVC pipes to a fixed length.

[0007] The objective of this invention can be achieved through the following technical solution: a PVC pipe length cutting device with overheat warning function, including a workbench, on which PVC pipes are placed, and a working component and a controller are provided on the workbench. The working component includes a movable bracket, a tension sensor, a hot cutting blade, an electric lifting cylinder and a power supply box. The controller is provided with a motion control system corresponding to the working component. The motion control system includes a data collection unit, a data analysis unit and an integrated interaction unit.

[0008] The data collection unit is used to collect the output current of the power supply box to the hot cutting knife, the motion parameters of the electric lifting cylinder, and the detection data on the tension sensor, and sends the output current, motion parameters, and detection data to the data analysis unit;

[0009] The data analysis unit establishes a temperature rise formula on the hot cutting blade based on the output current, obtains the hot cutting temperature of the hot cutting blade through the temperature rise formula, generates the basic motion state based on the hot cutting temperature and motion parameters, and substitutes the detection data into the basic motion state to generate reference information.

[0010] The integrated interactive unit controls the magnitude of the output current and motion parameters based on the basic motion state and reference information.

[0011] The workbench is further configured such that a cutting groove is provided on the position corresponding to the hot cutting blade, the hot cutting blade is located above the cutting groove, the electric lifting cylinder is located directly below the cutting groove, and the output shaft of the electric lifting cylinder is fixedly connected to the center point of the lower end of the movable bracket. The movable bracket is slidably connected to the workbench in the vertical direction via the electric lifting cylinder.

[0012] The configuration is further defined as follows: the tension sensor is installed on both sides of the upper end of the movable bracket, and an upper connecting plate is installed at the top of the tension sensor transmission rod, and a conductive block corresponding to the hot cutting knife is installed on the upper connecting plate.

[0013] The following configuration is further provided: a first motor is installed at both ends of the worktable corresponding to the cutting groove, and an upper pressure arc plate is installed on the output shaft of the first motor. The upper pressure arc plate is rotatably connected to the worktable along the output shaft of the first motor.

[0014] A further configuration is provided: a fixed bracket is installed directly above the cutting groove on the worktable; a second motor is installed at one end of the upper surface of the fixed bracket; a lead screw is installed at the output end of the second motor; the lead screw is set in a direction perpendicular to the length direction of the worktable, and the lead screw is parallel to the hot cutting blade.

[0015] A further configuration is provided: a threaded sleeve is threadedly connected to the lead screw, and a wire slide plate is installed at the lower end of the threaded sleeve, the position of which matches the hot cutting blade.

[0016] Further settings include: calculating the hot-cutting temperature of the hot-cutting blade using the product of its physical characteristics and output current in the temperature rise formula; presetting the melting temperature threshold of the PVC pipe in the data analysis unit; sending the melting temperature threshold to the basic operating state; and setting the operating mode of the hot-cutting blade to a preheating stage and a hot-cutting stage based on the motion parameters.

[0017] A: During the preheating stage, the hot cutting blade is located directly above the PVC pipe, and the hot cutting temperature is greater than the melting temperature threshold. The difference between the hot cutting temperature and the melting temperature threshold is set as the compensation temperature. The compensation temperature is lower than 10℃, and the compensation temperature during the preheating stage is a relative constant.

[0018] B: During the hot cutting stage, the hot cutting blade contacts the PVC pipe and performs the hot cutting action from top to bottom. The hot cutting temperature during the hot cutting stage is lower than the hot cutting temperature during the preheating stage but higher than the melting temperature threshold. The compensation temperature during the hot cutting stage is lower than the compensation temperature during the preheating stage. The compensation temperature during the hot cutting stage is a relative variable.

[0019] Further settings include: the motion parameter of the electric lifting cylinder is the downward movement speed of the hot cutting blade, and the ideal value on the tension sensor is preset in the data analysis unit. The ideal value is used to indicate that the PVC pipe is in an unobstructed state to the hot cutting blade during the hot cutting action. A hot cutting pressure calculation formula is established based on the physical properties of the PVC pipe and the hot cutting temperature of the hot cutting blade to calculate the hot cutting pressure. The balance coefficient is calculated using the hot cutting pressure and the detection data, and the following state is set according to the ideal data, detection data, and balance coefficient:

[0020] S1: During the hot-cutting operation, when the detected data is greater than the ideal value and the balance coefficient is equal to 1.05, the hot-cutting temperature is marked as the optimal state, and the output current and motion parameters remain unchanged.

[0021] S2: During the hot cutting operation, if the detected data is greater than the ideal value * 1.98, the hot cutting temperature is marked as a temperature shortage state. The controller increases the output current of the power supply box and reduces the downward movement speed of the hot cutting blade, or puts the hot cutting blade in a temporary interrupted downward movement state.

[0022] S3: During the hot cutting operation, if the detected data is greater than the ideal value but less than the ideal value * 1.12, the hot cutting temperature is marked as an over-temperature state. The controller reduces the output current of the power supply box and accelerates the downward movement speed of the hot cutting blade.

[0023] The present invention has the following beneficial effects:

[0024] 1. This invention utilizes the principle of thermal cutting to thermally cut PVC pipes. Specifically, the thermal cutting blade itself is heated by electricity, causing a localized molten state in the PVC pipe upon contact. Pressure is applied to the PVC pipe by the thermal cutting blade. Based on this, a motion control system is established. Its purpose is to address the "resistance" of the PVC pipe to the thermal cutting blade during the cutting action, using the thermal cutting temperature and motion parameters as a basis. This "resistance" is essentially the reaction force of the PVC pipe against the thermal cutting blade. In practice, the "resistance" is greatest when the PVC pipe is not subjected to thermal cutting temperature, and decreases when the PVC pipe is in a molten state. Furthermore, the magnitude of the "resistance" is directly related to the thermal cutting temperature. A tension sensor is used as the direct structure for detecting the "resistance." A balance coefficient is calculated based on the thermal cutting pressure and detection data. This balance coefficient indirectly determines the thermal cutting temperature during the thermal cutting action, thus directly detecting the overall thermal cutting process. More specifically, this system primarily targets two states: overheating and insufficient temperature.

[0025] 2. Without interfering with normal hot cutting operations, a wire slide plate is installed at the position of the corresponding hot cutting blade. The wire slide plate is used to "wrap" the hot cutting blade and moves along the length of the hot cutting blade. The specific purpose is: when the hot cutting blade "melts" the PVC pipe, molten PVC material will adhere to the outer surface of the hot cutting blade, which will affect the subsequent cutting quality and temperature control process, such as fine lines appearing on the cut and differences in temperature control. To address this, the wire slide plate is used to repeatedly scrape the hot cutting blade to remove and cool the PVC material adhering to and cooling the surface of the hot cutting blade. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a PVC pipe length cutting device with overheat warning function proposed in this invention;

[0028] Figure 2 This is a schematic diagram of the workbench component in a PVC pipe length cutting device with overheat warning function proposed in this invention;

[0029] Figure 3 This is a side view of the work frame in a PVC pipe length cutting device with overheat warning function proposed in this invention;

[0030] Figure 4This is an exploded view of the working components in a PVC pipe length cutting device with overheat warning function proposed in this invention.

[0031] Figure 5 This is a schematic diagram of the steel wire slide plate component in a PVC pipe length cutting device with overheat warning function proposed in this invention;

[0032] Figure 6 This is a partial front view of the work frame in a PVC pipe length cutting device with overheat warning function proposed in this invention.

[0033] In the diagram: 1. Workbench; 2. Controller; 3. Fixed bracket; 4. Electric lifting cylinder; 5. Movable bracket; 6. Power supply box; 7. Upper pressure arc plate; 8. First motor; 9. Second motor; 10. Lead screw; 11. Threaded sleeve; 12. Steel wire slide plate; 13. Hot cutting knife; 14. Conductive block; 15. Upper connecting plate; 16. Tension sensor. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0035] The quality of hot cutting of pipes is related to the movement (speed) of the hot wire or hot knife. Under the required temperature conditions, if the movement speed is too slow, it can result in a longer contact time between the hot wire or hot knife and the pipe cut, causing over-softening and abnormal deformation. Under high temperature conditions, the degree of deformation is even greater. Conversely, if there are speed differences during the movement process, problems such as cracks and gaps may appear at the cut. The following technical solutions are proposed to address these issues:

[0036] Reference Figures 1-6 This embodiment of a PVC pipe length cutting device with overheat warning function includes a workbench 1, on which PVC pipes are placed, and on which a working component and a controller 2 are provided. The working component includes a movable bracket 5, a tension sensor 16, a hot cutting blade 13, an electric lifting cylinder 4 and a power supply box 6. The controller 2 is provided with a motion control system corresponding to the working component. The motion control system includes a data collection unit, a data analysis unit and an integrated interaction unit.

[0037] The data collection unit is used to collect the output current of the hot cutting blade 13 from the power supply box 6, the motion parameters of the electric lifting cylinder 4, and the detection data from the tension sensor 16, and sends the output current, motion parameters, and detection data to the data analysis unit.

[0038] The data analysis unit establishes a temperature rise formula on the hot cutting blade 13 based on the output current, obtains the hot cutting temperature of the hot cutting blade 13 through the temperature rise formula, generates the basic motion state based on the hot cutting temperature and motion parameters, and substitutes the detection data into the basic motion state to generate reference information.

[0039] The integrated interactive unit controls the magnitude of the output current and motion parameters based on the basic motion state and reference information.

[0040] The workbench 1 has a cutting groove at the position corresponding to the hot cutting blade 13. The hot cutting blade 13 is located above the cutting groove, and the electric lifting cylinder 4 is located directly below the cutting groove. The output shaft of the electric lifting cylinder 4 is fixedly connected to the center point of the lower end of the movable support 5. The movable support 5 is slidably connected to the workbench 1 in the vertical direction through the electric lifting cylinder 4.

[0041] The tension sensor 16 is installed on both sides of the upper end of the movable bracket 5, and an upper connecting plate 15 is installed on the top of the transmission rod of the tension sensor 16. The upper connecting plate 15 is equipped with a conductive block 14 corresponding to the hot cutting knife 13.

[0042] Working principle: such as Figure 1 As shown, the PVC pipe to be cut is pushed into the workbench 1. According to the actual production requirements, a baffle or other structure is set at one end of the workbench 1. The distance between the baffle and the cutting groove is the cutting length, which will not be explained here.

[0043] It should be noted that the essence of the cutting process is as follows: the hot cutting blade 13 is heated by the power supply box 6 and the conductive block 14. After the hot cutting blade 13 is heated to a certain temperature, the electric lifting cylinder 4 drives the hot cutting blade 13 to move downward at a uniform speed. After contacting the PVC pipe, the PVC pipe is first "melted" by the high heat conditions, and then the pressure of the hot cutting blade 13 on the PVC pipe is used to complete the hot cutting action.

[0044] The hot cutting blade 13 must maintain a constant speed of rotation to ensure a smooth cut without cracks. The hot cutting blade 13 starts cutting from the top of the PVC pipe. The actual cutting distance during the hot cutting action of the hot cutting blade 13 is equal to the diameter of the PVC pipe. After the hot cutting action is completed, the hot cutting blade 13 returns to its original position. Example 2

[0045] This embodiment provides supplementary explanations and technical solution optimizations for the hot-cutting action in Embodiment 1:

[0046] The worktable 1 is equipped with a first motor 8 at both ends of the corresponding groove. The output shaft of the first motor 8 is equipped with an upper pressure arc plate 7, which is rotatably connected to the worktable 1 along the output shaft of the first motor 8.

[0047] A fixed bracket 3 is installed directly above the cutting groove on the worktable 1. A second motor 9 is installed at one end of the upper surface of the fixed bracket 3. A lead screw 10 is installed on the output end of the second motor 9. The lead screw 10 is set in a direction perpendicular to the length direction of the worktable 1 and is parallel to the hot cutting blade 13. A threaded sleeve 11 is threadedly connected to the lead screw 10. A wire slide plate 12 is installed at the lower end of the threaded sleeve 11. The position of the wire slide plate 12 matches that of the hot cutting blade 13.

[0048] Its purpose is to first use the upper pressure arc plate 7 to fix and clamp the PVC pipe after the thermal cutting operation begins, so as to maintain the stability of the PVC pipe during the thermal cutting process. This part will not be explained in detail.

[0049] It should be noted that during the hot cutting process, the hot cutting blade 13 will also "melt" some PVC material, and some PVC material will also adhere to the hot cutting blade 13. In the long-term operation, some PVC material will condense and adhere to the surface of the hot cutting blade 13, or PVC material will accumulate, which will eventually result in the cut surface of the hot cutting blade 13 not being in a completely smooth state, and may even affect the specific heat transfer process. Therefore, the cut surface after hot cutting may have fine lines and other unevenness.

[0050] For reference Figure 3 A wire slide plate 12 is installed directly above the hot cutting blade 13. The lower end of the wire slide plate 12 is open and is just stuck on the hot cutting blade 13. When the hot cutting blade 13 is in its initial state, that is, the reset position after each hot cutting action, the position where the wire slide plate 12 is in contact with the inner wall of the hot cutting blade 13 can be provided with a structure similar to a wire ring. Each time the hot cutting blade 13 resets, the second motor 9 is started to drive the wire slide plate 12 to move back and forth on the hot cutting blade 13, and the wire ring or other structure scrapes off any PVC material that may be attached to the surface of the hot cutting blade 13. Example 3

[0051] This embodiment illustrates the hot-cutting action described in Embodiments 1 and 2:

[0052] In the temperature rise formula, the hot cutting temperature of the hot cutting blade 13 is calculated by multiplying the physical characteristics of the hot cutting blade 13 by the output current. The melting temperature threshold of the PVC pipe is preset in the data analysis unit and sent to the basic operation state. The operation mode of the hot cutting blade 13 is set to the preheating stage and the hot cutting stage according to the motion parameters.

[0053] A: During the preheating stage, the hot cutting blade 13 is located directly above the PVC pipe, and the hot cutting temperature is greater than the melting temperature threshold. The difference between the hot cutting temperature and the melting temperature threshold is set as the compensation temperature. The compensation temperature is lower than 10℃, and the compensation temperature during the preheating stage is a relative constant.

[0054] B: During the hot cutting stage, the hot cutting blade 13 contacts the PVC pipe and performs a hot cutting action from top to bottom. The hot cutting temperature during the hot cutting stage is lower than the hot cutting temperature during the preheating stage but higher than the melting temperature threshold. The compensation temperature during the hot cutting stage is lower than the compensation temperature during the preheating stage. The compensation temperature during the hot cutting stage is a relative variable.

[0055] The motion parameter of the electric lifting cylinder 4 is the downward movement speed of the hot cutting blade 13. An ideal value is preset on the tension sensor 16 in the data analysis unit. This ideal value indicates that the PVC pipe is in an unobstructed state relative to the hot cutting blade 13 during the hot cutting action. A hot cutting pressure calculation formula is established based on the physical properties of the PVC pipe and the hot cutting temperature of the hot cutting blade 13. The hot cutting pressure is calculated, and a balance coefficient is calculated using the hot cutting pressure and detection data. Based on the ideal data, detection data, and balance coefficient, the following states are set:

[0056] S1: During the hot-cutting operation, when the detected data is greater than the ideal value and the balance coefficient is equal to 1.05, the hot-cutting temperature is marked as the optimal state, and the output current and motion parameters remain unchanged.

[0057] S2: During the hot cutting operation, if the detected data is greater than the ideal value * 1.98, the hot cutting temperature is marked as a temperature shortage state. The controller 2 increases the output current of the power supply box 6 and reduces the downward movement speed of the hot cutting blade 13, or puts the hot cutting blade 13 into a temporary interrupted downward movement state.

[0058] S3: During the hot cutting operation, if the detected data is greater than the ideal value but less than the ideal value * 1.12, the hot cutting temperature is marked as an over-temperature state. The controller 2 reduces the output current of the power supply box 6 and accelerates the downward movement speed of the hot cutting blade 13.

[0059] Operating principle: First, regarding the temperature rise formula, the specific formula is as follows: , among them Used to indicate heat cutting temperature, The value used to represent the output current. The energizing time can also be used to represent the action time of the thermal cutting operation, and among them... , These are used to represent the resistance and material constant in the physical properties of the hot-cutting blade 13, respectively. Based on the material properties of the PVC pipe itself, the melting temperature threshold can be directly obtained. The melting temperature threshold is... Essentially, this means that PVC pipes undergo partial melting under these temperature conditions. Therefore, theoretically, if... This can satisfy the hot cutting process, but in actual use: when the hot cutting blade 13 comes into contact with the PVC pipe, the heat transfer or natural heat dissipation occurs, while maintaining... Under the premise of stability, It may be in a state of slow decrease, therefore the hot-cutting temperature during the hot-cutting operation should meet the following requirements: , among them As a compensating temperature, and The temperature must not exceed 10℃. Based on the above, during the preheating stage, because only natural heat loss occurs, the amount of heat lost is negligible, and there is no heat transfer process, therefore the preheating stage... Relatively constant, only during the hot-cutting action. The temperature is gradually reduced; this section focuses on explaining and clarifying the hot-cutting temperature.

[0060] Regarding the hot cutting action: If the hot cutting blade 13 is not energized and therefore has no temperature change, relying solely on its downward movement to contact the PVC pipe, the PVC pipe may be cut or may not be cut. In this case, the PVC pipe exerts an upward reaction force on the hot cutting blade 12 / upper connecting plate 15, resulting in the maximum value on the tension sensor 16. If the hot cutting blade 13 is energized and generates a temperature change, and this temperature change precisely maintains the PVC pipe in the optimal cutting state (i.e., the temperature is just sufficient to satisfy the molten state of the PVC pipe), and the pressure of the hot cutting blade 13 is utilized, the tension sensor 16 merely serves as a connection structure between the movable bracket 5 and the upper connecting plate 15. This process represents the optimal cutting state, and the displayed value on the tension sensor 16 is a relative constant, corresponding to the aforementioned ideal value, which is marked as [ideal value]. And in ideal values The hot shear temperature under this condition is marked in the middle. ;

[0061] To further clarify: Based on an ideal scenario, if the temperature generated on the hot-cutting blade 13 is insufficient to achieve a molten state for the PVC pipe, the hot-cutting blade 13 can still perform hot cutting. However, the "resistance" encountered by the hot-cutting blade 13 from the PVC pipe will increase, resulting in a higher reading on the tension sensor 16. Conversely, if the temperature generated on the hot-cutting blade 13 not only meets the molten state requirements of the PVC pipe but is also significantly higher... In this state, when the hot cutter 13 comes into contact with the PVC pipe, the cutting process of the hot cutter 13 is "not required". The high heat conditions alone are enough to completely "melt" the local area of ​​the PVC pipe. So, when the gravity of the upper connecting plate 15, the hot cutter 13 and the conductive block 14 is ignored, the displayed value on the tension sensor 16 is close to 0 or even directly equal to 0.

[0062] Based on the two fundamental principles mentioned above, we will now explain the motion control system step by step:

[0063] The physical properties of PVC pipes include diameter, material properties, and formation. , among them , These are the diameter of the PVC pipe and the downward movement speed of the hot cutting blade 13, respectively. The formula for calculating the hot cutting pressure is as follows: , among them Used to indicate thermal shearing pressure, Used to describe the material properties of PVC pipes, and regarding To further clarify: this mainly targets the issues generated during the hot-cutting process. Because in practice, the heat transfer process of the hot cutting blade 13 is difficult to control, so maintaining... Under the premise of not changing, the problem of fine lines will still exist. The following specific control methods are proposed to address this:

[0064] First, the value displayed on the tension sensor 16 is used as the detection data, and the value displayed on the tension sensor 16 is marked as... The corresponding balance coefficient The calculation method is as follows: Theoretically This is difficult to achieve; therefore, the optimal state for marking in this embodiment is: =1.05* Therefore, the equilibrium coefficient under optimal conditions =1.05, the purpose of which is to "actively request" the hot cutting blade 13 to "accept" the "resistance" of the PVC pipe, which is essentially to reduce the hot cutting temperature on the hot cutting blade 13;

[0065] However, in actual operation, the balance coefficient is calculated again. To monitor the overall hot-switching action, specifically as follows: >1.98* , When the temperature reaches 1.98, it can be understood that the temperature is insufficient but a thermal shearing action can still be performed, so a heating process is required. , When the value is 1.12, it can be understood that the temperature is too high, so a cooling process is needed.

[0066] Considering the aforementioned under-temperature and over-temperature conditions, the preferred control method is to control the magnitude of the output current. To explain, among them It remains unchanged and needs to be combined with the specific temperature values ​​of "missing" or "exceeding," which is expressed as: based on the previous heat-cutting action. and The absolute value of the difference between them, i.e. and will Substitute into , In Replace with Generated And calculate in reverse to obtain the state in that state. It should be noted that: in this state This refers to the specific temperature value that is "missing" or "exceeding", so... Substitute into Calculated Finally Substitute into And calculated and will As the specific value for reducing or increasing the output current during the regulation process, it can directly monitor the overall operating status and avoid quality abnormalities caused by excessively high or low temperatures.

[0067] In addition, combined with To clarify, adjusting only the output current is sufficient; no further adjustment is required. However, as shown above: if a reduction is required... or improve At the same time, further attention is needed. The changes, therefore, in the above content The recalculated result Substitute into This section is a supplementary explanation to the above content and can be understood as: as a recalculation The variable at that time.

[0068] In summary: The process of quantitatively cutting PVC pipes using a hot-cutting blade involves heating the blade with electricity to achieve a cutting temperature sufficient to melt the PVC pipe. The cutting proceeds from top to bottom. During this process, the hot-cutting pressure is calculated based on the physical properties of the PVC pipe and displayed on a tension sensor. Essentially, the tension sensor directly reflects the resistance encountered during the hot-cutting action, thus demonstrating the direct impact of the hot-cutting temperature on the melting and cutting process of the PVC pipe. Specifically, the resistance is lower under overheating conditions and higher under underheating conditions, allowing for monitoring of the overall operational status.

[0069] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0070] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A PVC pipe length-cutting device with overheat warning function, comprising a workbench (1), characterized in that, PVC pipes are placed on the workbench (1), and a working component and a controller (2) are provided on the workbench (1). The working component includes a movable bracket (5), a tension sensor (16), a hot cutting knife (13), an electric lifting cylinder (4), and a power supply box (6). The controller (2) is provided with a motion control system corresponding to the working component. The motion control system includes a data collection unit, a data analysis unit, and an integrated interaction unit. The data collection unit is used to collect the output current of the power supply box (6) to the hot cutting knife (13), the motion parameters of the electric lifting cylinder (4) and the detection data on the tension sensor (16), and send the output current, motion parameters and detection data to the data analysis unit; The data analysis unit establishes a temperature rise formula on the hot cutting knife (13) based on the output current, obtains the hot cutting temperature of the hot cutting knife (13) through the temperature rise formula, generates the basic motion state based on the hot cutting temperature and motion parameters, and substitutes the detection data into the basic motion state to generate reference information. The integrated interactive unit controls the magnitude of the output current and motion parameters based on the basic state of the action and reference information. The tension sensor (16) is installed on both sides of the upper end of the movable bracket (5), and an upper connecting plate (15) is installed on the top of the transmission rod of the tension sensor (16). A conductive block (14) corresponding to the hot cutting knife (13) is installed on the upper connecting plate (15). In the temperature rise formula, the hot cutting temperature of the hot cutting blade (13) is calculated by multiplying the physical characteristics of the hot cutting blade (13) and the output current. The melting temperature threshold of the PVC pipe is preset in the data analysis unit and sent to the basic operation state. The operation mode of the hot cutting blade (13) is set to the preheating stage and the hot cutting stage according to the motion parameters. A: During the preheating stage, the hot cutting blade (13) is located directly above the PVC pipe, and the hot cutting temperature is greater than the melting temperature threshold. The difference between the hot cutting temperature and the melting temperature threshold is set as the compensation temperature. The compensation temperature is lower than 10℃, and the compensation temperature during the preheating stage is a relative constant. B: During the hot cutting stage, the hot cutting blade (13) contacts the PVC pipe and performs the hot cutting action from top to bottom. The hot cutting temperature during the hot cutting stage is lower than the hot cutting temperature during the preheating stage and higher than the melting temperature threshold. The compensation temperature during the hot cutting stage is lower than the compensation temperature during the preheating stage. The compensation temperature during the hot cutting stage is a relative variable.

2. The PVC pipe length cutting device with overheat warning function according to claim 1, characterized in that, The workbench (1) has a cutting groove at the position corresponding to the hot cutting knife (13). The hot cutting knife (13) is located above the cutting groove, and the electric lifting cylinder (4) is located directly below the cutting groove. The output shaft of the electric lifting cylinder (4) is fixedly connected to the center point of the lower end of the movable bracket (5). The movable bracket (5) is slidably connected to the workbench (1) in the vertical direction through the electric lifting cylinder (4).

3. A PVC pipe length-cutting device with overheat warning function according to claim 2, characterized in that, The workbench (1) is equipped with a first motor (8) at both ends of the corresponding groove. An upper pressure arc plate (7) is installed on the output shaft of the first motor (8). The upper pressure arc plate (7) is rotatably connected to the workbench (1) along the output shaft of the first motor (8).

4. A PVC pipe length-cutting device with overheat warning function according to claim 3, characterized in that, A fixed bracket (3) is installed on the workbench (1) directly above the corresponding cutting groove. A second motor (9) is installed on one end of the upper surface of the fixed bracket (3). A lead screw (10) is installed on the output end of the second motor (9). The direction of the lead screw (10) is perpendicular to the length direction of the workbench (1), and the lead screw (10) is parallel to the hot cutting blade (13).

5. A PVC pipe length-cutting device with overheat warning function according to claim 4, characterized in that, The lead screw (10) is threaded with a threaded sleeve (11), and a wire slide plate (12) is installed at the lower end of the threaded sleeve (11). The setting position of the wire slide plate (12) matches that of the hot cutting knife (13).

6. A PVC pipe length-cutting device with overheat warning function according to claim 5, characterized in that, The motion parameter of the electric lifting cylinder (4) is the downward movement speed of the hot cutting blade (13), and the ideal value on the tension sensor (16) is preset in the data analysis unit. The ideal value is used to indicate that the PVC pipe is in an unobstructed state to the hot cutting blade (13) during the hot cutting action. The hot cutting pressure calculation formula is established based on the physical properties of the PVC pipe and the hot cutting temperature of the hot cutting blade (13). The hot cutting pressure is calculated, and the balance coefficient is calculated based on the hot cutting pressure and the detection data. The following state is set according to the ideal data, the detection data and the balance coefficient: S1: During the hot-cutting operation, when the detected data is greater than the ideal value and the balance coefficient is equal to 1.05, the hot-cutting temperature is marked as the optimal state, and the output current and motion parameters remain unchanged. S2: During the hot cutting action, if the detected data is greater than the ideal value * 1.98, the hot cutting temperature is marked as a temperature shortage state. The controller (2) increases the output current of the power supply box (6) and reduces the downward movement speed of the hot cutting blade (13), or puts the hot cutting blade (13) into a temporary interrupted downward movement state. S3: During the hot cutting action, if the detected data is greater than the ideal value and less than the ideal value * 1.12, the hot cutting temperature is marked as an over-temperature state. The controller (2) reduces the output current of the power supply box (6) and accelerates the downward movement speed of the hot cutting blade (13).

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