Bench saw leaning grid capable of achieving laser ranging

Abstract

The invention provides a bench saw leaning grid capable of laser ranging, and relates to the technical field of bench saws, the bench saw leaning grid comprises a workbench and a saw blade arranged at the center of the workbench, one side of the workbench is provided with a lead screw type electric sliding rail, the lead screw type electric sliding rail is provided with a rail and a lead screw, one part of the lead screw is provided with a reverse thread, and the other part of the lead screw is provided with a laser ranging device. A first leaning grid and a second leaning grid are installed on the rail and arranged on the two sides of the saw blade respectively, and the lead screw type electric sliding rail is further provided with two self-locking mechanisms. The bench saw leaning grid capable of achieving laser ranging can be matched with the characteristics of positioning rotation of the lead screw and fixed arrangement of the first oil cylinder, the technical means of self-locking of the lead screw during bench saw machining is achieved, the stability of the first leaning grid and the second leaning grid during bench saw cutting is enhanced, the precision of bench saw machining is also ensured, and the working efficiency is improved. The lead screw has the technical effects of transmission and fixation at the same time, the arrangement of a fixing assembly for fixing the leaning grid is omitted, the production cost of equipment is saved, and the operation process is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of table saws, and particularly to a table saw fence with laser ranging function. Background Art

[0002] As a device for quickly and accurately sawing materials, table saws are widely used. Table saws, band saws and other bench cutting tools usually have a fence on the workbench, which is used for guiding during cutting to ensure the straightness of the workpiece to be cut.

[0003] According to the needs of the workpiece to be cut, the fence needs to be frequently moved on the workbench. Usually, a pointer is provided on the fence base, and a scale is provided on the front side edge of the workbench under the fence base. The distance that the fence moves on the workbench, that is, the cutting width value, is read by the pointer scale. There may be errors in the position where the scale is attached and the reading of the scale, resulting in errors in the cutting width. Moreover, most fences are set as single pieces, and the workpiece on one side is easily offset due to unilateral force, and there is a risk of lateral ejection of the workpiece during jamming. Summary of the Invention

[0004] The purpose of the present invention is to make up for the deficiencies of the prior art and propose a table saw fence with laser ranging function, which solves the problems that there may be errors in reading the scale of the fence, resulting in errors in the cutting width, and most fences are set as single pieces, and the workpiece on one side is easily offset due to unilateral force, and there is a risk of lateral ejection of the workpiece during jamming.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A table saw fence with laser ranging function, including a workbench and a saw blade arranged at the center of the workbench. A screw-type electric slide rail is installed on one side of the workbench. The screw-type electric slide rail has a track and a screw. A reverse thread is provided on a part of the screw. A first fence and a second fence are installed on the track, and are respectively arranged on both sides of the saw blade. The screw-type electric slide rail is also provided with two self-locking mechanisms. One self-locking mechanism is fixed on the outer shell of the screw-type electric slide rail and is used to lock the rotation of the screw of the screw-type electric slide rail itself. The other self-locking mechanism slides on the outer shell of the screw-type electric slide rail and is installed on the second fence and arranged on the reverse thread part of the screw. When the self-locking mechanism on the second fence locks the screw, the screw-type electric slide rail drives the screw to rotate, so that the first fence and the second fence move away from or close to each other. When the self-locking mechanism on the second fence does not lock the screw, the screw-type electric slide rail drives the screw to rotate, the position of the second fence remains unchanged, and the first fence translates to change the distance from the saw blade. Detection mechanisms are installed on both the first fence and the second fence to detect the distance between themselves and the saw blade.

[0006] Preferably, the self-locking mechanism includes a tapered sleeve and a driving part. The tapered sleeve is made of a metal with a high elastic modulus. An internal thread is provided inside the tapered sleeve. The upper end of the tapered sleeve has a slit, and connecting plates are fixedly connected to both ends at the slit. The driving part controls the closing or opening of the slit, causing the inner diameter of the tapered sleeve to change, so as to engage with or disengage from the external thread of the lead screw.

[0007] Preferably, the driving part includes a first oil cylinder. The first oil cylinder arranged on the second baffle is slidably arranged on the lead screw type electric slide rail. The other first oil cylinder is fixed on the housing of the lead screw type electric slide rail. The end of the piston rod of the first oil cylinder is fixedly connected with a connecting rod. The connecting rod passes through the adjacent connecting plate and is fixed on the other connecting plate.

[0008] Preferably, the self-locking mechanism further includes a limiting plate. The limiting plate located on the second baffle is slidably connected to the housing of the lead screw type electric slide rail. The other limiting plate is fixed on the housing of the lead screw type electric slide rail. A spring is connected between the opposite connecting plate and the limiting plate.

[0009] Preferably, a chute is provided on the housing of the lead screw type electric slide rail for installing the first oil cylinder. An empty groove is provided at the bottom of the housing of the lead screw type electric slide rail to cooperate with the translation of the connecting plate.

[0010] Preferably, the first baffle and the second baffle have the same structure. The detection mechanism includes a laser rangefinder, a digital display module and a measuring machine housing. The laser rangefinder and the digital display module are arranged inside the measuring machine housing. A connecting block is detachably connected to the end of the measuring machine housing of the first baffle. A lead screw sleeve is fixed on the connecting block. The lead screw sleeve engages with the external thread of the lead screw. A tapered sleeve is detachably connected to the end of the measuring machine housing of the second baffle through a connecting block; A displacement sensor is installed at the limiting plate, a force sensor is installed at the connecting plate, and a deformation sensor is installed at the spring; the displacement of the limiting plate is collected in real time through the displacement sensor, the force value of the connecting plate is collected by the force sensor, and the compression deformation of the spring is collected by the deformation sensor to form an original data stream; the original data is preprocessed, and the displacement, force value and deformation value are uniformly converted into displacement, force value and deformation value in the 0-1 interval according to the dimension; the preprocessed displacement, force value and deformation value are added to obtain a fusion value; prediction is carried out according to the fusion value and the preset fuzzy logic to obtain a real-time decision value, and the real-time decision value K is transmitted to the warning mechanism to drive the corresponding level of audible and visual alarm and the actions of the lead screw type electric slide rail, the first oil cylinder and the motor; at the same time, the historical K values are recorded and the trend is analyzed. If it is continuous for N times, a maintenance prompt signal is generated to prompt to check the wear condition of the self-locking mechanism, where K>50.

[0011] Preferably, the preset fuzzy logic includes: Fuzzify the weighted fusion value F into {low load, medium load, high load}; Fuzzify the data change rate ΔF, that is, the change amount of F per unit time, into {gentle, fluctuating, drastic}; Set up a fuzzy rule base, specifically: if F is "low load" and ΔF is "gentle", then output "normal"; if F is "high load" or ΔF is "drastic", then output "emergency shutdown"; map the fuzzy output to a specific value K, where k ranges from 0 to 100, and divide the decision interval: If K < 30, it is in a normal state and no warning is triggered; if 30 ≤ K < 70, it is in a warning state and the yellow warning light is activated; if K ≥ 70, it is in an emergency state, triggering a red alarm and cutting off the power supply of the table saw.

[0012] Preferably, the laser rangefinder and the digital display module are electrically connected through a connecting wire. The measuring machine housing is also provided with a battery pack, a battery box, a battery box cover, and a switch. The connecting wire connects the battery box, the digital display module, and the laser rangefinder. The battery pack supplies power to the digital display module and the laser rangefinder. The power is turned on by the switch. When the switch is turned on, the laser emitted by the laser rangefinder irradiates the saw blade, measures the actual distance between the edge of the cutting piece and the saw blade, and is displayed through the digital display module; The digital display module can be specifically set as an industrial intelligent digital display meter; A PLC control panel is installed on the workbench, and the PLC control panel is electrically connected to the screw-type electric slide rail, the first oil cylinder, the motor, the laser rangefinder, and the digital display module.

[0013] Preferably, a motor is fixedly installed at the bottom of the workbench. A coupling is fixedly connected to the center of the saw blade and the end of the output shaft of the motor. Tooth columns are arranged on both coupling. The two tooth columns are meshed with each other. A dust collection box is also fixedly connected to the bottom of the workbench. The dust collection box is installed below the saw blade.

[0014] Preferably, the warning mechanism includes a support rod. A slide rail is arranged at the rear end of the workbench. Support rods are fixed to the tails of the first fence and the second fence. Each support rod is slidably installed inside the slide rail and a downward-facing conical rod is fixedly connected to the end. The tip of each conical rod extends outside the slide rail. Two pairs of second oil cylinders are fixedly connected inside the slide rail. The piston rod end of each pair of second oil cylinders is detachably connected with an elastic limit belt. According to the use states of the first fence and the second fence, the corresponding elastic limit belt is driven to contact the conical rod to generate different degrees of local deformation, forming a hard block for the first fence and the second fence; A pin hole is opened at the piston rod end of the second oil cylinder, and a fixing pin is arranged in the pin hole to fix both ends of the elastic limit belt.

[0015] Compared with the prior art, the table saw backrest capable of laser ranging has the following beneficial effects: 1. The first backing is pressed against one side of the workpiece, and the cutting width of the workpiece is determined by detecting the distance between the first backing and the saw blade. The second backing is pressed against the workpiece to stabilize it, eliminating the offset caused by unilateral force or the jagged edge of the cut caused by vibration during cutting. At the same time, the second backing forms a symmetrical clamping force on the workpiece, reducing the risk of lateral ejection of the workpiece when the saw blade is stuck.

[0016] 2. After adjusting the positions of the first and second backrests, start the first oil cylinder separately arranged on the screw rod, so that the two connecting plates are close together, squeeze the tapered sleeve, and reduce its inner diameter to an interference fit with the screw rod thread to achieve hard engagement. In combination with the characteristics of the screw rod positioning rotation and the fixed setting of the first oil cylinder, the technical means of self-locking of the screw rod during table saw processing is realized, the stability of the first and second backrests during table saw cutting is reinforced, and the accuracy of table saw processing is ensured, so that the screw rod has the technical effects of transmission and fixation at the same time, eliminating the setting of the fixing component to fix the backrest, saving the production cost of the equipment and simplifying the operation process.

[0017] 3. When the cutting width needs to be adjusted, the positions of the first and second supports can be adjusted according to the specific situation. When adjusting the position of the first support, remove the first cylinder pressure of the tapered sleeve of the second support. The tapered sleeve is made of high elastic modulus metal material and has the characteristic of no plastic deformation after complex deformation. The tapered sleeve elastically recovers, the inner diameter increases, and the engagement with the screw is disengaged. At this time, the screw-type electric slide is started, and the second support does not contact the screw, so it does not change its own position, and only the position of the first support is translated. After adjusting the position of the first support, if the position of the second support needs to be adjusted to fit the workpiece, manually press the second support close to the workpiece and then fix it. The operation is convenient.

[0018] 4. If the equipment status detection is a warning, the fit between the tapered sleeve and the screw rod may become loose, and the front ends of the first and second backrests have a safety hazard of lifting. Start the corresponding second oil cylinder, and the piston rod of the second oil cylinder will contract to move the two ends of the elastic limit belt inward, while the middle area and the tapered rod form a local deformation zone. The length of the elastic limit belt itself is elongated, and the resulting elastic force acts on the support rod, so that the support rod is pressed tightly on the slide rail, maintaining the stability of one end of the backrest, and the other end is pressed by the staff in an emergency, so that both ends of the backrest are stably pressed on the workbench, isolating the safety accident of lifting due to unstable end connection during backrest operation.

[0019] Other advantages, objects, and features of the present invention will be set forth in part in the following description, and in part will be obvious to those skilled in the art upon examination of the following, or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the tooth column meshing structure of the present invention; Figure 3 is a schematic diagram of the structure of the connecting block and the self-locking mechanism of the present invention; Figure 4 is of the present invention Figure 3 schematic diagram of the enlarged structure at A in; Figure 5 is a schematic diagram of the structure of the conical sleeve and the limiting plate of the present invention; Figure 6 is of the present invention Figure 1 schematic diagram of the enlarged structure at B in; Figure 7 is a schematic diagram of the structure of the screw-type electric slide rail of the present invention; Figure 8 is a schematic diagram of the structure of the conical sleeve at the bottom of the second baffle and the screw rod of the present invention; Figure 9 is a schematic diagram of the structure of the detection mechanism of the present invention; Figure 10 is of the present invention Figure 9 schematic diagram of the enlarged structure at C in; Figure 11 is a schematic diagram of the structure of the warning mechanism of the present invention; Figure 12 is a schematic diagram of the structure of the support rod and the slide rail of the present invention; Figure 13 is a schematic diagram of the structure of the second oil cylinder and the conical rod of the present invention; Figure 14 is a schematic diagram of the structure in the second processing state of the present invention.

[0021] In the figure: 1. Workbench; 3. First backrest; 4. Second backrest; 5. Switch; 6. Screw-type electric slide rail; 601. Chute; 602. Screw rod; 603. Empty slot; 7. Self-locking mechanism; 701. Tapered sleeve; 702. Limit plate; 703. Connecting plate; 704. Spring; 705. Connecting rod; 706. First oil cylinder; 707. Internal thread; 8. Connecting block; 9. Dust collection box; 10. Saw blade; 11. Motor; 12. Tooth column; 13. Coupling shaft; 14. Screw rod sleeve; 15. Connecting wire; 16. Digital display module; 17. Battery pack; 18. Battery box cover; 19. Battery box; 20. Laser rangefinder; 21. Measuring machine housing; 22. Warning mechanism; 2201. Slide rail; 2202. Support rod; 2203. Second oil cylinder; 2204. Conical rod; 2205. Elastic limit band; 2206. Bracket; 2207. Fixed pin. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1 to 10, the present invention provides the following embodiments: A laser rangefinder table saw fence, including a workbench 1 and a saw blade 10 disposed at the center of the workbench 1. A screw-type electric slide rail 6 is installed on one side of the workbench 1. The screw-type electric slide rail 6 has a track and a screw 602. A part of the screw 602 is provided with a reverse thread. A first fence 3 and a second fence 4 are installed on the track, respectively disposed on both sides of the saw blade 10. The screw-type electric slide rail 6 is also provided with two self-locking mechanisms 7. One of the self-locking mechanisms 7 is fixed on the outer shell of the screw-type electric slide rail 6 for locking the rotation of the screw 602 of the screw-type electric slide rail 6 itself. The other self-locking mechanism 7 slides on the outer shell of the screw-type electric slide rail 6 and is installed on the second fence 4 and disposed on the reverse thread part of the screw 602. When the self-locking mechanism 7 on the second fence 4 locks the screw 602, the screw-type electric slide rail 6 drives the screw 602 to rotate, so that the first fence 3 and the second fence 4 move away from or close to each other. When the self-locking mechanism 7 on the second fence 4 does not lock the screw 602, the screw-type electric slide rail 6 drives the screw 602 to rotate, the position of the second fence 4 remains unchanged, and the first fence 3 translates to change the distance from the saw blade 10. Detection mechanisms are installed on both the first fence 3 and the second fence 4 to detect the distance between themselves and the saw blade 10. The first fence 3 and the second fence 4 fixed by the characteristics of the screw 602 will also remain fixed, which is convenient to operate, enabling the screw 602 to have the technical effects of both transmission and fixation at the same time, eliminating the need for a fixing component to fix the fence, saving the production cost of the equipment, and simplifying the operation process.

[0024] In this embodiment, the self-locking mechanism 7 includes a tapered sleeve 701 and a driving part. The tapered sleeve 701 is made of a metal with a high elastic modulus. An internal thread 707 is provided inside the tapered sleeve 701. The upper end of the tapered sleeve 701 has a slit, and connecting plates 703 are fixedly connected to both ends of the slit. The driving part controls the closing or opening of the slit, causing the inner diameter of the tapered sleeve 701 to change, so as to engage with or disengage from the external thread of the lead screw 602. The driving part includes a first oil cylinder 706. The first oil cylinder 706 provided on the second fence 4 is slidably arranged on the lead screw type electric slide rail 6, and another first oil cylinder 706 is fixed to the outer shell of the lead screw type electric slide rail 6. The end of the piston rod of the first oil cylinder 706 is fixedly connected to a connecting rod 705. The connecting rod 705 passes through the adjacent connecting plate 703 and is fixed to the other connecting plate 703. The self-locking mechanism 7 further includes a limiting plate 702. The limiting plate 702 located on the second fence 4 is slidably connected to the outer shell of the lead screw type electric slide rail 6, and the other limiting plate 702 is fixed to the outer shell of the lead screw type electric slide rail 6. A spring 704 is connected between the opposite connecting plate 703 and the limiting plate 702. Under the limiting action of the tapered sleeve 701 by the chute 601 and the empty slot 603, when the lead screw 602 rotates, the tapered sleeve 701 and the lead screw sleeve 14 both translate in the direction of the external thread of the lead screw 602 with which they are engaged, achieving the purpose of adjusting the distance between the two fences. After adjusting the positions of the first fence 3 and the second fence 4, the first oil cylinder 706 separately provided on the lead screw 602 is started, so that the two connecting plates 703 are brought together, squeezing the tapered sleeve 701 to reduce its inner diameter to an interference fit with the thread of the lead screw 602, realizing hard engagement. Combining the characteristics of the positioning rotation of the lead screw 602 and the fixed setting of the first oil cylinder 706, the technical means of self-locking of the lead screw 602 during table saw processing is realized.

[0025] In this embodiment, a chute 601 is provided on the outer shell of the lead screw type electric slide rail 6 for installing the first oil cylinder 706. An empty slot 603 is provided at the bottom of the outer shell of the lead screw type electric slide rail 6. The provided chute 601 is used for the translation of the first oil cylinder 706 in cooperation with the translation of the connecting plate 703. As Figure 7 shown, the positions of the chute 601 and the empty slot 603 correspond to the positions of the reverse thread.

[0026] In this embodiment, the first grating 3 and the second grating 4 have the same structure. The detection mechanism includes a laser rangefinder 20, a digital display module 16, and a measuring housing 21. The laser rangefinder 20 and the digital display module 16 are arranged inside the measuring housing 21. A connecting block 8 is detachably connected to the end of the measuring housing 21 of the first grating 3. A lead screw sleeve 14 is fixed to the connecting block 8. The lead screw sleeve 14 meshes with the external thread of the lead screw 602. A connecting block 8 is detachably connected to the end of the measuring housing 21 of the second grating 4. A tapered sleeve 701 is fixed to the connecting block 8. The laser rangefinder 20 and the digital display module 16 are electrically connected through a connecting wire 15. The measuring housing 21 is also provided with a battery pack 17, a battery box 19, a battery box cover 18, and a switch 5. The connecting wire 15 connects the battery box 19, the digital display module 16, and the laser rangefinder 20. The battery pack 17 supplies power to the digital display module 16 and the laser rangefinder 20. The power is turned on by the switch 5. When the switch 5 is turned on, the laser emitted by the laser rangefinder 20 irradiates on the saw blade 10, and the actual distance between the edge of the cutting piece and the saw blade 10 is measured and displayed through the digital display module 16. The digital display module 16 can be specifically set as an industrial intelligent digital display meter. The laser head of the laser rangefinder 20 irradiates on the saw blade 10, and the width of the workpiece after the saw blade 10 cuts can be judged. The second grating 4 on the other side is also provided with a laser rangefinder 20. The original width of the workpiece can be calculated by adding the values detected by the laser rangefinders 20 on both sides and the thickness of the saw blade 10. By measuring the width of the workpiece after processing twice, the cutting accuracy of the table saw can be detected. At the same time, when processing a workpiece with a width greater than the width of the workbench 1, the second grating 4 can be disassembled, as Figure 14 shown, the end of the second grating 4 and the connecting block 8 are fixed by bolts, which is convenient for disassembly to be applicable to workpieces of different models.

[0027] In this embodiment, a motor 11 is fixedly installed at the bottom of the workbench 1. Shaft couplings 13 are fixedly connected to the center of the saw blade 10 and the end of the output shaft of the motor 11 respectively. Tooth columns 12 are arranged on both shaft couplings 13. The two tooth columns 12 are meshed and connected with each other. A dust collection box 9 is also fixedly connected to the bottom of the workbench 1. The dust collection box 9 is installed below the saw blade 10. The provided dust collection box 9 is used to collect the debris that falls into the inside of the workbench 1 to prevent the connection part of the tooth columns 12 from being covered with debris, which affects the transmission between the tooth columns 12.

[0028] In this embodiment, a displacement sensor is installed at the limit plate 702, a force sensor is installed at the connecting plate 703, and a deformation sensor is installed at the spring 704. The displacement of the limit plate is collected in real time by the displacement sensor, the force value of the connecting plate is collected by the force sensor, and the compression deformation of the spring is collected by the deformation sensor to form an original data stream. The original data is preprocessed, and the displacement, force value, and deformation value are uniformly converted into displacement, force value, and deformation value in the 0-1 interval according to the dimension. The preprocessed displacement, force value, and deformation value are added to obtain a fusion value. According to the fusion value and the preset fuzzy logic, a prediction is made to obtain a real-time decision value, and the real-time decision value K is transmitted to the warning mechanism 22 to drive the corresponding-level sound and light alarm, the screw-type electric slide rail 6, the first oil cylinder 706, and the motor 11 to act. At the same time, the historical K value is recorded and the trend is analyzed. If it is continuous for N times, a maintenance prompt signal is generated to prompt to check the wear condition of the self-locking mechanism, where K > 50.

[0029] The preset fuzzy logic includes: Fuzzify the weighted fusion value F into {low load, medium load, high load}; Fuzzify the data change rate ΔF, that is, the change amount of F per unit time, into {gentle, fluctuating, drastic}; Set a fuzzy rule base, specifically: if F is "low load" and ΔF is "gentle", then output "normal"; if F is "high load" or ΔF is "drastic", then output "emergency stop"; map the fuzzy output to a specific value K, and the value of k ranges from 0 to 100, and divide the decision interval: If K < 30, it is in a normal state and no warning is triggered; if 30 ≤ K < 70, it is in a warning state and the yellow warning light is activated; if K ≥ 70, it is in an emergency state, a red alarm is triggered and the power supply of the table saw is cut off.

[0030] In this embodiment, the displacement sensor, force sensor and deformation sensor respectively monitor the displacement of the limit plate, the force of the connecting plate and the deformation of the spring, forming a multi-dimensional raw data stream to fully reflect the operating status of the equipment. Through dimensional unification and weighted fusion processing, data differences are eliminated, and a fusion value that comprehensively reflects the load of the equipment is obtained, thereby improving the accuracy and reliability of the decision-making basis. The fusion value F and its change rate ΔF are fuzzified into {low load, medium load, high load} and {smooth, fluctuating, violent} to adapt to complex and changeable actual working conditions and avoid the defect that the traditional threshold method is susceptible to noise interference. By presetting fuzzy rules (such as "high load" or "dramatic change" triggering emergency shutdown), dynamic response is achieved, which can avoid false alarms and quickly deal with potential risks. The fuzzy output is mapped to a specific value K, and the decision interval is divided (K<30 is normal, 30≤K<70 is warning, and K≥70 is emergency), so as to achieve a graded response from sound and light warning to power off, ensuring safe operation. The sensor collects data in real time and quickly calculates the fusion value. Combined with fuzzy logic, millisecond-level decision-making is achieved, and the screw-type electric slide rail, cylinder and motor action are adjusted in time to avoid equipment overload or failure. The real-time decision value K is transmitted to the early warning agency and the actuator to form a closed loop of "monitoring-decision-execution" to ensure that the equipment is always in a controllable state. Record the historical K value and analyze the trend. If K>50 (high load state) appears N times in a row, a maintenance prompt signal is generated to prompt the inspection of the wear of the self-locking mechanism. Through trend analysis, potential faults are discovered in advance, and the transition from "after-the-fact maintenance" to "pre-prevention" is realized, reducing the risk of equipment downtime and extending the service life. In an emergency state (K≥70), the power supply is automatically cut off to avoid personal injury and equipment damage, significantly improving safety. Through graded early warning and dynamic adjustment of the actuator, unplanned downtime is reduced, and production continuity and efficiency are improved.

[0031] In this embodiment, a slide rail 2201 is provided at the rear end of the workbench 1, and a support rod 2202 is fixed to the tail end of the first support rail 3 and the second support rail 4. Each support rod 2202 is slidably installed inside the slide rail 2201 and the end is fixedly connected to a tapered rod 2204 facing downward. The tip of each tapered rod 2204 extends out of the slide rail 2201. Two pairs of second oil cylinders 2203 are fixedly connected inside the slide rail 2201. The piston rod end of each pair of second oil cylinders 2203 is detachably connected to an elastic limiting belt 2205, which is driven according to the use status of the first support rail 3 and the second support rail 4. The corresponding elastic limiting belt 2205 contacts the conical rod 2204 to produce different degrees of local deformation, forming a hard block for the first backrest 3 and the second backrest 4; a pin hole is opened at the end of the piston rod of the second oil cylinder 2203, and a fixing pin 2207 is arranged in the pin hole to fix the two ends of the elastic limiting belt 2205; the material used for the elastic limiting belt 2205 is a thermoplastic elastomer, which is characterized by high elasticity, high elongation and high surface friction, and is suitable for scenes requiring anti-deformation, anti-skid or energy absorption. According to the above data analysis, the equipment status is normal, warning, and fault. Normal When the self-locking mechanism 7 at the front end is in a natural state, the spring 704 and the internal thread 707 are not worn, the first support 3 and the second support 4 can be stably moved or fixed, if the equipment status detection is a warning, the cooperation between the tapered sleeve 701 and the screw rod 602 may be loose, and the front ends of the first support 3 and the second support 4 have a safety hazard of tilting, and the corresponding second cylinder 2203 is started, and the piston rod of the second cylinder 2203 is contracted to a certain length (the end is lower than the tapered rod 2204), and the two ends of the elastic limiting belt 2205 are moved inward, and the middle area and the tapered rod are 2204 forms a local deformation zone, and the length of the elastic limiting belt 2205 itself is stretched. The resulting elastic force acts on the support rod 2202, so that the support rod 2202 is pressed against the slide rail 2201, thereby maintaining the stability of one end of the backrest, and the other end is pressed by the staff for emergency, so that both ends of the backrest are stably pressed on the workbench 1. If a fault occurs, the table saw operation is stopped immediately, and the second oil cylinder 2203 completely retracts the piston rod, and the maximum elastic force of the elastic limiting belt 2205 is exerted to fix the backrest, thereby isolating the safety accident of the end connection being unstable and tilting when the backrest is in operation.

[0032] In this embodiment, a PLC control panel is installed on the workbench 1. The PLC control panel is electrically connected to the screw-type electric slide 6, the first oil cylinder 706, the motor, the laser rangefinder and the digital display module. The PLC is used to realize intelligent management of the above-mentioned equipment, facilitate operation, and realize customized design according to different customer needs.

[0033] Working principle: Place the workpiece above the workbench 1. The first stop fence 3 and the second stop fence 4 press against both sides of the workpiece respectively. The workpiece contacts the high-speed rotating saw blade 10 for cutting. One side of the workpiece is pressed by the first stop fence 3. By detecting the distance between the first stop fence 3 and the saw blade 10, the cutting width of the workpiece is judged. The second stop fence 4 presses against the workpiece to stabilize it, eliminating the deviation caused by unilateral force or the serrated cutting edge caused by vibration during cutting. At the same time, the second stop fence 4 forms a symmetrical clamping force on the workpiece, reducing the risk of lateral ejection of the workpiece when the saw blade 10 jams.

[0034] Facing workpieces of different sizes and widths, the positions of the first stop fence 3 and the second stop fence 4 need to be adjusted to adapt to different workpieces. For example, Figure 1 As shown, the position where the second stop fence 4 is located is the reverse thread position set on the lead screw 602. When the tapered sleeve 701 on the second stop fence 4 is closed, the internal thread 707 meshes with the lead screw 602. Under the limiting action of the chute 601 and the empty groove 603 on the tapered sleeve 701, the lead screw 602 rotates, and the tapered sleeve 701 and the lead screw sleeve 14 both translate in the direction of the external thread of the lead screw 602 they mesh with, achieving the purpose of adjusting the distance between the two stop fences. After adjusting the positions of the first stop fence 3 and the second stop fence 4, start the first oil cylinder 706 separately set on the lead screw 602 to make the two connecting plates 703 lean together and squeeze the tapered sleeve 701, so that its inner diameter shrinks to an interference fit with the thread of the lead screw 602, realizing hard meshing. Combining the characteristics of the positioning rotation of the lead screw 602 and the fixed setting of the first oil cylinder 706, the technical means of self-locking of the lead screw 602 during table saw processing is realized, strengthening the stability of the first stop fence 3 and the second stop fence 4 during table saw cutting and ensuring the accuracy of table saw processing.

[0035] When the cutting width needs to be adjusted, the positions of the first stop fence 3 and the second stop fence 4 can be adjusted according to the specific situation. When adjusting the position of the first stop fence 3, remove the pressure of the first oil cylinder 706 on the tapered sleeve 701 of the second stop fence 4. The tapered sleeve 701 is made of a metal material with a high elastic modulus and has the characteristic of not undergoing plastic deformation after complex deformation. The tapered sleeve 701 elastically recovers and the slit opens as Figure 8As shown, the inner diameter increases and disengages from the screw rod. At this time, the screw rod type electric slide rail 6 is started. The second baffle 4 does not contact the screw rod 602, so its own position is not changed. Only the position of the first baffle 3 is translated. After adjusting the position of the first baffle 3, if it is necessary to adjust the position of the second baffle 4 to make it fit the workpiece, manually press the second baffle 4 against the workpiece, and then close the corresponding tapered sleeve 701 to achieve fixation. When the screw rod 602 does not rotate, due to the self-fixation of the screw rod 602 and the characteristic of the screw thread engagement between the screw rod 602 and the screw rod sleeve, the first baffle 3 and the second baffle 4 will also remain fixed. The operation is convenient, enabling the screw rod 602 to have the technical effects of both transmission and fixation at the same time, eliminating the need for a fixing component to set the fixation of the baffle, saving the production cost of the equipment, and simplifying the operation process.

[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A laser rangefinder table saw fence, comprising a workbench and a saw blade disposed at the center of the workbench, characterized in that: A screw-type electric slide rail is installed on one side of the workbench. The screw-type electric slide rail has a track and a screw. A reverse thread is provided on a part of the screw. A first fence and a second fence are installed on the track, and are respectively arranged on both sides of the saw blade. The screw-type electric slide rail is also provided with two self-locking mechanisms. One self-locking mechanism is fixed on the outer shell of the screw-type electric slide rail for locking the rotation of the screw itself of the screw-type electric slide rail. The other self-locking mechanism slides on the outer shell of the screw-type electric slide rail, and is installed on the second fence and arranged on the reverse-thread part of the screw. When the self-locking mechanism on the second fence locks the screw, the screw-type electric slide rail drives the screw to rotate, so that the first fence and the second fence move away from or close to each other. When the self-locking mechanism on the second fence does not lock the screw, the screw-type electric slide rail drives the screw to rotate, the position of the second fence remains unchanged, and the first fence translates to change the distance from the saw blade. Detection mechanisms are installed on both the first fence and the second fence to detect the distance between themselves and the saw blade.

2. The laser rangefinder table saw fence according to claim 1, wherein: The self-locking mechanism includes a tapered sleeve and a driving part. The tapered sleeve is made of a metal with a high elastic modulus. An internal thread is provided inside the tapered sleeve. The upper end of the tapered sleeve has a slit, and both ends of the slit are fixedly connected with connecting plates. The driving part controls the closing or opening of the slit, so that the inner diameter of the tapered sleeve changes, so as to engage with or disengage from the external thread of the screw.

3. A table saw fence capable of laser ranging according to claim 2, characterized in that: The driving part includes a first oil cylinder. The first oil cylinder arranged on the second fence is slidably arranged on the screw-type electric slide rail. The other first oil cylinder is fixed on the outer shell of the screw-type electric slide rail. The end of the piston rod of the first oil cylinder is fixedly connected with a connecting rod, and the connecting rod passes through the adjacent connecting plate and is fixed on the other connecting plate.

4. A table saw fence capable of laser ranging according to claim 3, characterized in that: The self-locking mechanism further includes a limiting plate. The limiting plate located on the second fence is slidably connected to the outer shell of the screw-type electric slide rail. The other limiting plate is fixed on the outer shell of the screw-type electric slide rail. A spring is connected between the opposite connecting plate and the limiting plate.

5. The laser rangefinder-capable table saw fence according to claim 4, wherein: A chute is opened on the outer shell of the screw-type electric slide rail for installing the first oil cylinder. An empty slot is opened at the bottom of the outer shell of the screw-type electric slide rail to cooperate with the translation of the connecting plate.

6. The laser rangefinder saw fence according to claim 5, wherein: The first fence and the second fence have the same structure. The detection mechanism includes a laser rangefinder, a digital display module and a measuring machine shell. The laser rangefinder and the digital display module are arranged in the measuring machine shell. A connecting block is detachably connected to the end of the measuring machine shell of the first fence, and a screw sleeve is fixed on the connecting block. The screw sleeve meshes with the external thread of the screw. A connecting block is detachably connected to the end of the measuring machine shell of the second fence, and a tapered sleeve is fixed on the connecting block; A displacement sensor is installed at the limiting plate, a force sensor is installed at the connecting plate, and a deformation sensor is installed at the spring; the displacement of the limiting plate is collected in real time by the displacement sensor, the force value of the connecting plate is collected by the force sensor, and the compression deformation amount of the spring is collected by the deformation sensor to form an original data stream; the original data is preprocessed, and the displacement amount, force value and deformation value are uniformly converted into displacement amount, force value and deformation value in the 0-1 interval according to the dimension; Add the preprocessed displacement, force value, and deformation value to obtain a fusion value; make a prediction based on the fusion value and a preset fuzzy logic to obtain a real-time decision value, and transmit the real-time decision value K to the warning mechanism to drive the corresponding-level audible and visual alarms and the actions of the screw-type electric slide rail, the first oil cylinder, and the motor; at the same time, record the historical K values and analyze the trend. If it is continuous for N times, generate a maintenance prompt signal to prompt an inspection of the wear condition of the self-locking mechanism, where K > 50.

7. The laser rangefinder capable table saw fence according to claim 6, wherein: The preset fuzzy logic includes: Fuzzify the weighted fusion value F into {low load, medium load, high load}; Fuzzify the data change rate ΔF, that is, the change amount of F per unit time, into {gentle, fluctuating, drastic}; Set up a fuzzy rule base. Specifically: if F is "low load" and ΔF is "gentle", then output "normal"; if F is "high load" or ΔF is "drastic", then output "emergency shutdown"; map the fuzzy output to a specific value K, where k ranges from 0 to 100, and divide the decision interval: When K < 30, it is in a normal state and no warning is triggered; when 30 ≤ K < 70, it is in a warning state and the yellow warning light is activated; when K ≥ 70, it is in an emergency state and the red alarm is triggered and the power supply of the table saw is cut off.

8. A table saw fence capable of laser ranging according to claim 7, characterized in that: The laser rangefinder and the digital display module are electrically connected through a connecting wire. The measuring machine housing is also provided with a battery pack, a battery box, a battery box cover, and a switch. The connecting wire connects the battery box, the digital display module, and the laser rangefinder. The battery pack supplies power to the digital display module and the laser rangefinder. The power is turned on by the switch. When the switch is turned on, the laser emitted by the laser rangefinder irradiates the saw blade, and the actual distance between the edge of the cutting piece and the saw blade is measured and displayed through the digital display module; The digital display module can specifically be set as an industrial intelligent digital display meter; A PLC control panel is installed on the workbench, and the PLC control panel is electrically connected to the screw-type electric slide rail, the first oil cylinder, the motor, the laser rangefinder, and the digital display module.

9. The laser rangefinder table saw fence according to claim 1, wherein: A motor is fixedly installed at the bottom of the workbench. A coupling is fixedly connected to the center of the saw blade and the end of the output shaft of the motor. Tooth columns are arranged on both coupling shafts, and the two tooth columns are meshed with each other. A dust collection box is also fixedly connected to the bottom of the workbench, and the dust collection box is installed below the saw blade.

10. A table saw fence capable of laser ranging according to claim 6, characterized in that: The warning mechanism includes a support rod. A slide rail is provided at the rear end of the workbench. Support rods are fixed to the tails of the first fence and the second fence. Each support rod is slidably installed inside the slide rail and a conical rod facing downward is fixedly connected to the end. The tip of each conical rod extends outside the slide rail. Two pairs of second oil cylinders are fixedly connected inside the slide rail. The piston rod end of each pair of second oil cylinders is detachably connected with an elastic limit belt. According to the usage states of the first fence and the second fence, the corresponding elastic limit belt is driven to contact the conical rod to generate different degrees of local deformation, forming a rigid block on the first fence and the second fence; A pin hole is provided at the piston rod end of the second oil cylinder, and a fixing pin is arranged in the pin hole to fix both ends of the elastic limit belt.

Images