Tapping screw occlusal force detection equipment

Abstract

The invention relates to the technical field of self-tapping screw detection, in particular to self-tapping screw occlusal force detection equipment, which comprises a box body; and the first detection assembly comprises a lifting plate driven to ascend and descend, a mounting block is embedded in the upper end face of the lifting plate, two clamping blocks are symmetrically arranged above the first downward pressing rod, and the clamping blocks are driven to clamp screws. After a screw is installed by adjusting torsion through a slide rheostat, current conveyed to a circuit where an electromagnet is located can be adjusted as well, the electromagnet adjusts the magnetic force to attract the sliding amplitude of a sliding stop block in a liquid inlet box, the flow of hydraulic oil is adjusted, the hydraulic pressure of the hydraulic oil is increased, and the precision is matched with the torsion of the screw; and when the lifting plate is driven to descend, a force matched with a screw torsion force is applied, so that a final test result is prevented from being influenced by an overlarge or undersmall descending force of the lifting plate when the screw occlusal force is tested.

Description

Technical Field

[0001] The invention relates to the technical field of self-tapping screw detection, and in particular to a self-tapping screw bite force detection device. Background Art

[0002] Self-tapping screws are screws that can cut threads in materials by themselves, and are usually used to fasten parts together. After production, self-tapping screws need to be tested for their bite force. Testing the bite force of screws is crucial because it directly affects the strength of the connection and the safety of the structure, prevents loosening due to factors such as vibration, avoids material damage, and ensures product consistency and standardization.

[0003] After searching, a self-tapping screw bite force detection device disclosed in publication number CN116773435B is used. When detecting the bite force of the screw, the screw is first fixed, and then the screw is pulled to test the bite force. However, when testing the bite force of the screw, if the force applied per unit time in the prior art is too large, the actual performance and bite force of the screw cannot be accurately evaluated, affecting subsequent design and selection. If the force applied per unit time is too small, the bite force detection time will be prolonged, reducing the detection efficiency. Moreover, in the process of installing the self-tapping screws, the sizes of the self-tapping screws are different. Self-tapping screws of different sizes require different torques to install the self-tapping screws on the tested plate. Excessive torque may cause damage to the screw head or thread, or even break it, affecting the stability of the connection. If the torque is too small, it cannot be screwed into the mounting plate. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a self-tapping screw bite force detection device, which can effectively solve the problem in the prior art that the force applied to test the screw bite force does not match the size of the screw.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a self-tapping screw bite force detection device, comprising:

[0007] Box body;

[0008] Detection component one, the detection component one includes a lifting plate driven to lift, the upper end surface of the lifting plate is embedded with a mounting block, the lower end surface of the mounting block is fixedly mounted with a pressure sensor, two clamping blocks are symmetrically arranged above the mounting block, the clamping blocks are driven to clamp the screws, the detection component one also includes a liquid injection tube, a liquid inlet box is fixedly mounted in the liquid injection tube, brackets are sleeved on the outer wall of the liquid injection tube and on both sides of the liquid inlet box, an electromagnet is fixedly mounted on the lower end surface of the bracket at a position corresponding to the upper end surface of the liquid inlet box, the electromagnet is electrically connected to a controller, and the controller is electrically connected to the pressure sensor, and a sliding block is airtightly slidably mounted on the inner wall of the liquid inlet box;

[0009] A screw installation assembly, the screw installation assembly includes a magnetorheological fluid coupling that is driven to rise and fall, the magnetorheological fluid coupling includes a coupling body, a magnetorheological fluid arranged in the coupling body, and an electromagnetic device acting on the magnetorheological fluid, a first pressing rod is fixedly installed on the output end of the magnetorheological fluid coupling, and a magnetic tool head for magnetically adsorbing screws is fixedly installed on the lower end of the first pressing rod.

[0010] Preferably, a fixing plate is fixedly installed at the middle position of the inner wall of the box body, a fixing block is fixedly installed on the upper end surface of the fixing plate, a pressure groove is opened in the fixing block, two sliding blocks are symmetrically slidably installed in the fixing block, the two sliding blocks are fixed to the clamping block at one opposite end, and a first spring is fixedly installed between the two clamping blocks and the corresponding pressure grooves.

[0011] The cam is provided with two support plates at the bottom and the support plates are provided with two support plates, and the support plates are provided with a spring, and the two support plates are provided with a spring.

[0012] Preferably, a driving source is fixedly installed on the upper end surface of the box body, and the output end of the driving source passes through the box body and is fixedly connected with a screw, and a second lifting column is threadedly installed on the outer wall of the screw, and two fixing frames are symmetrically installed on the inner top end of the box body, and the second lifting column consists of a rectangular block and sliding bars integrally formed on both sides of the rectangular block, and the sliding bars are slidably connected to the inner wall of the fixing frame, and a C-shaped baffle is fixedly installed on the outer side and at a lower position of the rectangular block, and a connecting shaft is rotatably installed on the lower end surface of the rectangular block, and the lower end of the screw passes through the second lifting column and is fixedly connected to the connecting shaft Fixed connection, two limit telescopic rods are symmetrically installed on the lower end surface of the C-shaped baffle, and a bearing plate is fixedly installed on the lower end surfaces of the two limit telescopic rods. A sliding sleeve is fixedly installed on the lower end surface of the connecting shaft, and a limit slide rod is slidably installed in the sliding sleeve. The lower end surface of the limit slide rod is fixedly connected to the magnetorheological fluid coupling, and a sliding resistor is fixedly installed on the side of the bearing plate away from the gas injection box. The sliding resistor includes a resistance rod and a sliding piece slidably connected to the resistance rod, and the sliding piece is driven to slide on the resistance rod, and the sliding resistor is electrically connected to the electromagnet.

[0013] Preferably, the outer wall of the sliding sleeve is sleeved with a first rotating tooth, a rotating shaft is fixedly installed on the lower end surface of the C-shaped baffle and at a position away from the connecting shaft, a second rotating tooth is rotatably installed on the lower end surface of the rotating shaft, and two upper tooth heads are symmetrically installed on the lower end surface of the second rotating tooth, an air injection box is fixedly installed on the upper end surface of the bearing plate and at a position away from the connecting shaft, a lower pressure plate is elastically and slidably installed in the air injection box, a one-way valve is embedded in the upper end surface and middle position of the lower pressure plate, and two lower tooth heads are symmetrically installed on the upper end surface of the lower pressure plate.

[0014] Preferably, an external box is fixedly installed on the side of the sliding rheostat away from the gas injection box, a slide is slidably installed on the inner wall of the external box, the slide is fixed to the slide, a fourth spring is fixedly installed between one side of the slide and the inner wall of the external box, a first corrugated telescopic tube is fixedly installed on the inner wall of the external box and away from the fourth spring, one end of the first corrugated telescopic tube is fixed to the slide, a solenoid valve is embedded in the slide, an air outlet is provided on the side of the external box away from the first corrugated telescopic tube, and the gas injection box is connected to the first corrugated telescopic tube through a pipe penetrating the external box.

[0015] Preferably, two rings are symmetrically installed on both sides of the supporting plate, guide rods are slidably installed on the inner walls of the two rings, magnetic contacts are fixedly installed on the lower end faces of the guide rods, and the magnetic contacts are externally connected to an external power supply. Two powered contacts are fixedly installed on the upper end face of the fixed block, and the powered contacts are externally connected to the input ends of the controller, and the powered contacts are electrically connected to the magnetic contacts.

[0016] Preferably, it also includes a second pressure detection component, which includes two second downward pressure rods symmetrically installed on the lower end surface of the lifting plate, two cylinders symmetrically installed on the inner bottom end of the box body, the second downward pressure rods are air-tightly slidably connected to the inner wall of the cylinder, a U-shaped bracket is fixedly installed at the lower end of the box body and away from the cylinder, an airbag is fixedly installed at the lower position of the inner wall of the U-shaped bracket, an air pressure sensor is arranged in the airbag, the air pressure sensor is signal-connected to the input end of the controller, an air outlet is opened on one side of the airbag, the upper end surface of the airbag is connected to a second corrugated expansion tube, a fixing plate is fixedly installed on the upper end surface of the second corrugated expansion tube, a trigger switch is fixedly installed on the upper end surface of the fixing plate, and the trigger switch is signal-connected to the controller.

[0017] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] First, after the sliding rheostat adjusts the torque and installs the screw, the current delivered to the electromagnet will also be adjusted, allowing the electromagnet to adjust the magnetic force to attract the sliding block to slide inside the liquid inlet box, so that the flow of hydraulic oil can be adjusted. In this way, the hydraulic pressure of the hydraulic oil increases the accuracy to match the torque of the screw. When driving the lifting plate to descend, a force matching the torque of the screw will be applied to improve the accuracy of the test and avoid excessive or insufficient force when the lifting plate is lowered when testing the screw bite force, which will affect the final result of the test.

[0019] Second, through the sliding rheostat, during the process of installing the screw, air is continuously pumped through the air injection box, and the position of the slider is adjusted to allow the sliding rheostat to adjust the voltage. The adjusted voltage will act on the electromagnetic device set inside the magnetorheological fluid coupling to adjust the viscosity of the magnetorheological fluid, so that the magnetorheological fluid can adjust the torque of the first downward pressure rod and the magnetic cutter head to twist the screw, and twist the screw into the interior of the mounting block for installation.

[0020] Third, when the lifting plate drives the mounting block to test the bite force of the screw, the lifting plate and the mounting block that are continuously applying force will separate from the screw, and a sudden downward force will be generated. This force will drive the second downward pressure rod to slide quickly inside the cylinder and squeeze the air inside the cylinder, allowing the air to enter the airbag and the second bellows. The air is retained inside the airbag and the second bellows and allowed to expand. The expanded second bellows will drive the fixing plate to automatically trigger the switch to contact each other and send a signal to the controller. The controller will stop sending current to the electromagnet. The electromagnet that loses its magnetic force will allow the sliding block to slide inside the liquid inlet box and stop delivering hydraulic oil, thereby preventing the lifting plate from driving the mounting block to continuously apply downward force, thereby ending the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the decomposed structure of the detection component of the present invention;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the fixing block of the present invention;

[0026] Figure 5 for Figure 4 The enlarged structural diagram at A in the middle;

[0027] Figure 6 It is a schematic diagram of the structure of the screw installation assembly of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the bearing plate of the present invention;

[0029] Figure 8 is a schematic diagram of the second rotating tooth structure of the present invention;

[0030] Fig. 9 It is a schematic diagram of the structure of the external box of the present invention;

[0031] Fig.10 It is a structural schematic diagram of the second pressure detection component of the present invention.

[0032] 1. Box body; 2. Detection component 1; 201. Fixed plate; 202. Fixed block; 203. Liquid injection pipe; 204. Pressure groove; 205. Sliding block; 206. Clamping block; 207. First spring; 208. First mounting plate; 209. First lifting column; 210. Second spring; 211. Lifting plate; 212. Second mounting plate; 213. Hydraulic cylinder; 214. Sliding rod; 215. Third spring; 216. Mounting block; 217. Liquid inlet box; 218. Bracket; 219. Electromagnet; 220. Sliding block; 221. Support baffle; 3. Screw mounting assembly; 301. Driving source; 302. Fixed frame; 303. Screw; 304. Second lifting column; 305. C-shaped baffle; 306. Connecting shaft; 307. First rotating tooth; 308. Rotating shaft; 309 , second rotating tooth; 310, upper tooth head; 311, sliding sleeve; 312, limit telescopic rod; 313, limit sliding rod; 314, bearing plate; 315, magnetorheological fluid coupling; 316, first pressing rod; 317, magnetic cutter head; 318, sliding rheostat; 319, external box; 320, first corrugated telescopic tube; 321, slide plate; 322, fourth spring; 323, solenoid valve; 324. Gas injection box; 325. Lower tooth head; 326. One-way valve; 327. Ring; 328. Guide rod; 329. Magnetic contact; 330. Power contact; 4. Pressure detection component II; 401. Second lower pressure rod; 402. Cylinder; 403. U-shaped bracket; 404. Air bag; 405. Air outlet; 406. Second corrugated telescopic tube; 407. Fixed plate; 408. Trigger switch. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] Example: Refer to Figures 1 to 10 , a self-tapping screw bite force detection device, comprising:

[0036] Box body 1;

[0037] Detection component 12, detection component 12 includes a lifting plate 211 driven to lift, the upper end surface of the lifting plate 211 is embedded with a mounting block 216, the lower end surface of the mounting block 216 is fixedly mounted with a pressure sensor, two clamping blocks 206 are symmetrically arranged above the mounting block 216, the clamping blocks 206 are driven to clamp the screws, and the detection component 12 also includes a liquid injection tube 203, a liquid inlet box 217 is fixedly installed in the liquid injection tube 203, and a bracket 218 is sleeved on the outer wall of the liquid injection tube 203 and on both sides of the liquid inlet box 217, and an electromagnetic is fixedly installed at the lower end surface of the bracket 218 corresponding to the upper end surface of the liquid inlet box 217 The electromagnet 219 is electrically connected to a controller, and the controller is electrically connected to a pressure sensor. A sliding block 220 is airtightly and slidably installed on the inner wall of the liquid inlet box 217. The detection component 2 is used to detect the bite force of the screw. The clamping block 206 can clamp the head of the screw. After the screw is twisted into the interior of the mounting block 216, the bite force of the screw is tested by applying force to the mounting block 216. Through the setting of the electromagnet 219, the electromagnet 219 can adjust the sliding position of the sliding block 220 in the liquid inlet box 217, so as to adjust the input amount of hydraulic oil per unit time.

[0038] The screw installation component 3 includes a magnetorheological fluid coupling 315 that is driven to lift and lower. The magnetorheological fluid coupling 315 includes a coupling body, a magnetorheological fluid arranged in the coupling body, and an electromagnetic device acting on the magnetorheological fluid. A first push-down rod 316 is fixedly installed at the output end of the magnetorheological fluid coupling 315. A magnetic cutter head 317 for magnetically adsorbing screws is fixedly installed at the lower end of the first push-down rod 316. The screw installation component 3 is used to install the screw into the interior of the mounting block 216, and test the torque when the screw is twisted in through the magnetorheological fluid coupling 315. The force applied to the mounting block 216 to test the bite force of the screw is adjusted through the torque of the screw, so that when testing screws of different types, different forces can be used to test the bite force of the screw.

[0039] Reference Figure 3 A fixing plate 201 is fixedly installed at the middle position of the inner wall of the box body 1, a fixing block 202 is fixedly installed on the upper end surface of the fixing plate 201, a pressure groove 204 is opened in the fixing block 202, two sliders 205 are symmetrically slidably installed in the fixing block 202, the two sliders 205 are fixed to the clamping block 206 at the opposite ends, and a first spring 207 is fixedly installed between the two clamping blocks 206 and the corresponding pressure grooves 204

[0040] Reference Figures 3 to 5Two first mounting plates 208 are symmetrically mounted on the upper end surface of the fixed plate 201, and two pairs of first lifting columns 209 are symmetrically mounted on the lower end surfaces of the two first mounting plates 208. A piston plate is fixedly mounted on the lower end surface of the first lifting column 209. Two groups of support baffles 221 are symmetrically mounted on the inner wall of the box body 1 and below the fixed plate 201. A slide bar 214 is fixedly mounted between each group of support baffles 221. The outer wall of the slide bar 214 is slidably connected to the lifting plate 211. The outer wall of the slide bar 214 is sleeved with a third spring 215. The two ends of the third spring 215 are respectively fixed to the lifting plate 211 and the support baffle 221. The upper end surface of the lifting plate 211 is fixed to the mounting block 216. Two second mounting plates 212 are symmetrically installed on the lower end surface of the support plate 221, and two pairs of hydraulic cylinders 213 are symmetrically installed on the upper end surface of the second mounting plate 212. The inner wall of the hydraulic cylinder 213 is air-tightly slidably connected to the piston plate, and a second spring 210 is fixedly installed between the lower end surface of the piston plate and the inner bottom wall of the hydraulic cylinder 213. One side of the fixed block 202 is connected to the injection pipe 203, and the injection pipe 203 is connected to each pair of hydraulic cylinders 213 through a pipeline. The injection pipe 203 is used to transport liquid with hydraulic pressure to the hydraulic cylinder 213 and the pressure groove 204. The set pressure groove can allow hydraulic oil to enter it, and the hydraulic oil squeezes the slider 205 and the clamping block 206 to clamp the screw head.

[0041] Reference Figures 6 to 9A driving source 301 is fixedly installed on the upper end surface of the box body 1, and the output end of the driving source 301 passes through the box body 1 and is fixedly connected with a screw 303. The outer wall of the screw 303 is threadedly installed with a second lifting column 304. Two fixing frames 302 are symmetrically installed on the inner top of the box body 1. The second lifting column 304 consists of a rectangular block and sliding bars integrally formed on both sides of the rectangular block. The sliding bar is slidably connected to the inner wall of the fixing frame 302. A C-shaped baffle 305 is fixedly installed on the outer side and at a lower position of the rectangular block. A connecting shaft 306 is rotatably installed on the lower end surface of the rectangular block. The lower end of the screw 303 passes through the second lifting column 304 and is fixedly connected to the connecting shaft 306. Two limiting telescopic rods 312 are symmetrically installed on the lower end surface of the C-shaped baffle 305. The lower end surfaces of the two limiting telescopic rods 312 are fixedly installed with a bearing plate 314. The connecting shaft 3 A sliding sleeve 311 is fixedly installed on the lower end surface of 06, and a limiting slide rod 313 is slidably installed in the sliding sleeve 311. The lower end surface of the limiting slide rod 313 is fixedly connected to the magnetorheological fluid coupling 315. A sliding rheostat 318 is fixedly installed on the side of the supporting plate 314 away from the gas injection box 324. The sliding rheostat 318 includes a rheostat rod and a sliding piece slidably connected to the rheostat rod. The sliding piece is driven to slide on the rheostat rod. The sliding rheostat 318 is electrically connected to the electromagnet 219. Through the setting of the driving source 301, the driving source 301 can drive the magnetorheological fluid coupling 315 to descend and rotate at the same time, and the magnetorheological fluid inside the magnetorheological fluid coupling 315 will adjust the viscosity through the sliding rheostat 318, so that the magnetorheological fluid coupling 315 drives the first downward pressure rod 316 and the magnetic cutter head 317 to rotate.

[0042] Reference Fig. 9The outer wall of the sliding sleeve 311 is sleeved with a first rotating tooth 307, a rotating shaft 308 is fixedly installed on the lower end surface of the C-shaped baffle 305 and at a position away from the connecting shaft 306, a second rotating tooth 309 is rotatably installed on the lower end surface of the rotating shaft 308, and two upper tooth heads 310 are symmetrically installed on the lower end surface of the second rotating tooth 309, a gas injection box 324 is fixedly installed on the upper end surface of the bearing plate 314 and at a position away from the connecting shaft 306, a lower pressure plate is elastically slidably installed in the gas injection box 324, a one-way valve 326 is embedded in the upper end surface and middle position of the lower pressure plate, and two lower tooth heads 325 are symmetrically installed on the upper end surface of the lower pressure plate, an external box 319 is fixedly installed on the side of the sliding rheostat 318 away from the gas injection box 324, and the inner wall of the external box 319 slides A slide plate 321 is dynamically installed, and the slide plate 321 is fixed to the sliding piece. A fourth spring 322 is fixedly installed between one side of the slide plate 321 and the inner wall of the external box 319. A first corrugated telescopic tube 320 is fixedly installed on the inner wall of the external box 319 and at a position away from the fourth spring 322. One end of the first corrugated telescopic tube 320 is fixed to the slide plate 321. A solenoid valve 323 is embedded in the slide plate 321. An air outlet is provided on the side of the external box 319 away from the first corrugated telescopic tube 320. The gas injection box 324 is connected to the first corrugated telescopic tube 320 through a pipeline penetrating the external box 319. The gas injection box 324 is driven to pump air through the first rotating tooth 307 and the second rotating tooth 309, and the sliding piece of the sliding rheostat 318 is driven to move and adjust the voltage.

[0043] Reference Fig. 9 Two rings 327 are symmetrically installed on both sides of the carrier plate 314, and guide rods 328 are slidably installed on the inner walls of the two rings 327. A magnetic contact 329 is fixedly installed on the lower end surface of the guide rod 328. The magnetic contact 329 is externally connected to an external power supply. Two energized contacts 330 are fixedly installed on the upper end surface of the fixed block 202. The energized contacts 330 are externally connected to the input end of the controller. The energized contacts 330 are electrically connected to the magnetic contacts 329. Through the electrical connection between the energized contacts 330 and the magnetic contacts 329, the solenoid valve 323 can be powered and closed.

[0044] Reference Fig.10, and also includes a pressure detection component 24, which includes two second pressing rods 401 symmetrically installed on the lower end surface of the lifting plate 211, and two cylinders 402 are symmetrically installed on the inner bottom end of the box body 1. The second pressing rods 401 are airtightly slidably connected with the inner wall of the cylinder 402, and a U-shaped bracket 403 is fixedly installed at the inner bottom end of the box body 1 and away from the cylinder 402. An airbag 404 is fixedly installed at the lower position of the inner wall of the U-shaped bracket 403, and a pressure sensor is arranged in the airbag 404. The air pressure sensor is connected to the input signal of the controller, an air outlet 405 is provided on one side of the airbag 404, the upper end face of the airbag 404 is connected to the second bellows expansion tube 406, a fixing plate 407 is fixedly installed on the upper end face of the second bellows expansion tube 406, a trigger switch 408 is fixedly installed on the upper end face of the fixing plate 407, the trigger switch 408 is connected to the controller signal, and through the setting of the pressure detection component 24, the pressure detection component 24 can detect the pressure during the test.

[0045] The working principle of the present invention is as follows:

[0046] The screw to be inspected is adsorbed and fixed to the lower end of the magnetic cutter head 317 by the magnetism of the magnetic cutter head 317, and the driving source 301 is turned on to drive the screw rod 303 to rotate. The screw rod 303 will drive the second lifting column 304 to slide and descend in the inner wall of the fixing frame 302. At the same time, the rotating screw rod 303 will drive the connecting shaft 306 to rotate, thereby driving the screw to descend and rotate. However, due to the magnetorheological fluid arranged inside the magnetorheological fluid coupling 315 (the viscosity of the magnetorheological fluid is relatively low at this time), the force of the connecting shaft 306 cannot be transmitted to the magnetorheological fluid coupling 315 to drive the first pressing rod 31 6 and the magnetic cutter head 317 rotate, and when the screw descends through the fixing block 202 and contacts the mounting block 216, the limiting telescopic rod 312 and the limiting sliding rod 313 drive the bearing plate 314 to slide upward, and the upward sliding bearing plate 314 drives the gas injection box 324 and the lower tooth head 325 to rise. At this time, the connecting shaft 306 drives the first rotating tooth 307 to rotate during the process of being driven to rotate, and the first rotating tooth 307 drives the second rotating tooth 309 to rotate by meshing with the second rotating tooth 309 during the rotation process, and the rotating second rotating tooth 309 drives the upper tooth head 310 to rotate. The rotating upper tooth head 310 will reciprocate and slide in contact with the rising lower tooth head 325. During the sliding contact process, the lower tooth head 325 will be squeezed to drive the lower pressure plate to slide on the inner wall of the gas injection box 324, and squeeze the air inside the gas injection box 324, allowing the air to flow into the first corrugated telescopic tube 320 through the pipeline. After the squeezing stops, the outside air will enter the inside of the gas injection box 324 through the one-way valve 326, and the air entering the first corrugated telescopic tube 320 will cause the first corrugated telescopic tube 320 to expand, and the expanded first corrugated telescopic tube 320 will push the slide plate 321 in the inner wall of the external box 319. Sliding, the sliding slide plate 321 will drive the slider to move so that the sliding rheostat 318 adjusts the electromagnetic device. The electromagnetic device adjusts the voltage through the sliding rheostat 318 to increase the current / electromagnetic field strength transmitted to the magnetorheological fluid, so that the viscosity of the magnetorheological fluid is enhanced. The electromagnetic field strength of the electromagnetic device is proportional to the viscosity of the magnetorheological fluid / the mechanical transmission efficiency of the connecting shaft 306 and the first pressing rod 316 and the magnetic cutter head 317 / and the torque of the first pressing rod 316 and the magnetic cutter head 317 on the screw, so as to twist the screw into the mounting block 216, so as to avoid excessive or insufficient force to twist the screw and cause inaccurate subsequent testing;

[0047] It should be noted that, when the carrier plate 314 is driven to descend, the carrier plate 314 drives the magnetic contact 329 to contact the energized contact 330 through the guide rod 328, so that the solenoid valve 323 is closed;

[0048] The hydraulic oil is delivered to the inside of the pressure groove 204 through the injection pipe 203 by an external hydraulic pump, pushing the slider 205 and the clamping block 206 to move relative to each other to clamp the screw head, and part of the hydraulic oil is delivered to the inside of the hydraulic cylinder 213 through the pipeline. When delivered to the inside of the hydraulic cylinder 213, it drives the lifting plate 211 to descend through the second mounting plate 212 and compresses the third spring 215. The descending lifting plate 211 drives the mounting block 216 to descend, and the pressure sensor installed on the lower end surface of the mounting block 216 detects the bite between the mounting block 216 and the screw. Combined force is used to test the bite force of the screw. When the mounting block 216 applies force downward until the screw is disengaged, the pressure sensor will keep recording the bite force value between the mounting block 216 and the screw. The pressure value before the monitored pressure value decreases instantly is the bite force value, and the detection is judged to be over after the screw is disengaged. This solution adopts fixing the screw to the inside of the mounting block 216, and then fixing the screw. The bite force of the screw is tested by applying force to the mounting block 216. This can avoid the problem of inconvenience in dragging the screw due to the small force surface of the screw when dragging the screw.

[0049] By setting the electromagnet 219, when the sliding rheostat 318 adjusts the torque installation screw by adjusting the viscosity of the magnetorheological fluid, the sliding rheostat 318 also acts on the electromagnet 219 to adjust the current delivered to the electromagnet 219. The magnetic force of the electromagnet 219 is proportional to the torque of the screw. When the magnetic force of the electromagnet 219 is strong, it will greatly attract the sliding block 220 to slide inside the liquid inlet box 217 to increase the delivery flow of the injection tube 203. When the magnetic force of the electromagnet 219 is weak, it will slightly attract the sliding block 220 to slide inside the liquid inlet box 217 to reduce the delivery flow of the injection tube 203, so that the hydraulic pressure generated by the hydraulic oil delivered per unit time is small, and the torque of the twisting screw is matched to detect the bite force of the screw;

[0050] By setting the second pressing rod 401, when the lifting plate 211 is driven to descend, the second pressing rod 401 will slide inside the cylinder 402 and squeeze the air inside the cylinder 402, and the squeezed air will be transported to the inside of the airbag 404 through the pipeline to expand the airbag 404, and a small amount of air will be discharged to the outside through the air outlet 405. The air transported to the inside of the airbag 404 and the air discharged through the air outlet 405 will form a gas volume difference and be temporarily stored in the inside of the airbag 404. When the lifting plate 211 continuously applies force downward until it is detached from the outer surface of the screw, the lifting plate 211 will instantly generate a sudden downward force, causing the second pressing rod 401 to slide quickly inside the cylinder 402, and squeeze the air inside the cylinder 402 to be transported to the inside of the airbag 404, so that the airbag 404 and the second bellows telescopic tube 406 will expand quickly, and the expanded second bellows telescopic tube 406 will drive the trigger switch 408 to contact each other through the fixing plate 407 to transmit a signal to the controller, and the controller will disconnect the power supply of the electromagnet 219 to lose its magnetism, so as to allow the sliding block 220 to slide inside the liquid inlet box 217 and stop delivering hydraulic oil, thus completing the detection;

[0051] It should be noted that an air pressure sensor is provided inside the airbag 404, which can detect the pressure inside the airbag 404 in real time. At the same time, when the lifting plate 211 continuously applies downward force to separate from the outer surface of the screw, the air pressure sensor can also change direction to assist in detecting the force value of the lifting plate 211, so as to detect the lifting plate 211 driving the descending test screw bite force. After the mounting block 216 is separated from the screw, the compressed third spring 215 will drive the lifting plate 211 to rise, allowing the hydraulic oil in the hydraulic cylinder 213 to be discharged through the pipeline again, and the driving source 301 will drive the supporting plate 314 to rise, and disconnect the power supply of the magnetic contact 329 and the energized contact 330, so that the solenoid valve 323 opens to discharge the air inside the first corrugated telescopic tube 320.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-tapping screw bite force detection device, characterized in that: include: Box body (1); A detection component (2), the detection component (2) comprising a lifting plate (211) driven to lift, a mounting block (216) embedded in the upper end surface of the lifting plate (211), a pressure sensor fixedly mounted on the lower end surface of the mounting block (216), two clamping blocks (206) symmetrically arranged above the mounting block (216), the clamping blocks (206) driven to clamp the screw, the detection component (2) further comprising a liquid injection tube (203), the liquid injection tube ( A liquid inlet box (217) is fixedly installed in the liquid inlet box (203), a bracket (218) is sleeved on the outer wall of the liquid injection tube (203) and on both sides of the liquid inlet box (217), an electromagnet (219) is fixedly installed at a position corresponding to the upper end surface of the liquid inlet box (217) on the lower end surface of the bracket (218), the electromagnet (219) is electrically connected to a controller, and the controller is electrically connected to a pressure sensor, and a sliding block (220) is airtightly slidably installed on the inner wall of the liquid inlet box (217); A screw installation assembly (3), the screw installation assembly (3) comprising a magnetorheological fluid coupling (315) driven to be lifted and lowered, the magnetorheological fluid coupling (315) comprising a coupling body, a magnetorheological fluid arranged in the coupling body, and an electromagnetic device acting on the magnetorheological fluid, a first pressing rod (316) being fixedly mounted on the output end of the magnetorheological fluid coupling (315), and a magnetic cutter head (317) for magnetically adsorbing screws being fixedly mounted on the lower end of the first pressing rod (316).

2. A self-tapping screw bite force detection device according to claim 1, characterized in that: A fixing plate (201) is fixedly installed at the middle position of the inner wall of the box body (1), a fixing block (202) is fixedly installed on the upper end surface of the fixing plate (201), a pressure groove (204) is provided in the fixing block (202), two sliding blocks (205) are symmetrically slidably installed in the fixing block (202), the two sliding blocks (205) are fixed to a clamping block (206) at opposite ends, and a first spring (207) is fixedly installed between the two clamping blocks (206) and the corresponding pressure grooves (204).

3. A self-tapping screw bite force detection device according to claim 2, characterized in that: Two first mounting plates (208) are symmetrically mounted on the upper end surface of the fixed plate (201), two pairs of first lifting columns (209) are symmetrically mounted on the lower end surfaces of the two first mounting plates (208), a piston plate is fixedly mounted on the lower end surface of the first lifting columns (209), two groups of support baffles (221) are symmetrically mounted on the inner wall of the box body (1) and below the fixed plate (201), a slide bar (214) is fixedly mounted between each group of support baffles (221), the outer wall of the slide bar (214) is slidably connected to the lifting plate (211), the outer wall of the slide bar (214) is sleeved with a third spring (215), the two ends of the third spring (215) are respectively fixed to the lifting plate (211) and the support baffle (221), The upper end surface of the lifting plate (211) is fixed to the mounting block (216); two second mounting plates (212) are symmetrically mounted on the lower end surface of the supporting baffle (221); two pairs of hydraulic cylinders (213) are symmetrically mounted on the upper end surface of the second mounting plate (212); the inner wall of the hydraulic cylinder (213) is airtightly slidably connected to the piston plate; a second spring (210) is fixedly mounted between the lower end surface of the piston plate and the inner bottom wall of the hydraulic cylinder (213); one side of the fixed block (202) is connected to the injection pipe (203); the injection pipe (203) is connected to each pair of hydraulic cylinders (213) through a pipeline; the injection pipe (203) is used to transport liquid with hydraulic pressure to the hydraulic cylinder (213) and the pressure tank (204).

4. The self-tapping screw bite force detection device according to claim 2, characterized in that: A driving source (301) is fixedly mounted on the upper end surface of the box body (1); an output end of the driving source (301) passes through the box body (1) and is fixedly connected to a screw rod (303); a second lifting column (304) is threadedly mounted on the outer wall of the screw rod (303); two fixing frames (302) are symmetrically mounted on the inner top of the box body (1); the second lifting column (304) is composed of a rectangular block and sliding bars integrally formed on both sides of the rectangular block; the sliding bars are slidably connected to the inner wall of the fixing frame (302); a C-shaped baffle (305) is fixedly mounted on the outer side and at a lower position of the rectangular block; a connecting shaft (306) is rotatably mounted on the lower end surface of the rectangular block; the lower end of the screw rod (303) passes through the second lifting column (304) and is fixedly connected to the connecting shaft (306); Two limiting telescopic rods (312) are symmetrically mounted on the lower end surface of the C-shaped baffle (305); a bearing plate (314) is fixedly mounted on the lower end surfaces of the two limiting telescopic rods (312); a sliding sleeve (311) is fixedly mounted on the lower end surface of the connecting shaft (306); a limiting sliding rod (313) is slidably mounted in the sliding sleeve (311); the lower end surface of the limiting sliding rod (313) is fixedly connected to the magnetorheological fluid coupling (315); a sliding rheostat (318) is fixedly mounted on the side of the bearing plate (314) away from the gas injection box (324); the sliding rheostat (318) comprises a resistance rod and a sliding plate slidably connected to the resistance rod; the sliding plate is driven to slide on the resistance rod; and the sliding rheostat (318) is electrically connected to the electromagnet (219).

5. The self-tapping screw bite force detection device according to claim 4, characterized in that: The outer wall of the sliding sleeve (311) is sleeved with a first rotating tooth (307); a rotating shaft (308) is fixedly installed on the lower end surface of the C-shaped baffle (305) and at a position away from the connecting shaft (306); a second rotating tooth (309) is rotatably installed on the lower end surface of the rotating shaft (308); two upper tooth heads (310) are symmetrically installed on the lower end surface of the second rotating tooth (309); an air injection box (324) is fixedly installed on the upper end surface of the bearing plate (314) and at a position away from the connecting shaft (306); a lower pressure plate is elastically and slidably installed in the air injection box (324); a one-way valve (326) is embedded on the upper end surface and at the middle position of the lower pressure plate; and two lower tooth heads (325) are symmetrically installed on the upper end surface of the lower pressure plate.

6. The self-tapping screw bite force detection device according to claim 4, characterized in that: An external box (319) is fixedly installed on the side of the sliding rheostat (318) away from the gas injection box (324); a slide plate (321) is slidably installed on the inner wall of the external box (319); the slide plate (321) is fixed to the sliding plate; a fourth spring (322) is fixedly installed between one side of the slide plate (321) and the inner wall of the external box (319); a first bellows telescopic tube (320) is fixedly installed on the inner wall of the external box (319) and away from the fourth spring (322); one end of the first bellows telescopic tube (320) is fixed to the slide plate (321); a solenoid valve (323) is embedded in the slide plate (321); an air outlet is provided on the side of the external box (319) away from the first bellows telescopic tube (320); and the gas injection box (324) is connected to the first bellows telescopic tube (320) through a pipeline penetrating the external box (319).

7. The self-tapping screw bite force detection device according to claim 4, characterized in that: Two sleeves (327) are symmetrically mounted on both sides of the carrier plate (314); guide rods (328) are slidably mounted on the inner walls of the two sleeves (327); magnetic contacts (329) are fixedly mounted on the lower end faces of the guide rods (328); the magnetic contacts (329) are externally connected to an external power source; two power contacts (330) are fixedly mounted on the upper end face of the fixed block (202); the power contacts (330) are externally connected to the input ends of the controller; the power contacts (330) are electrically connected to the magnetic contacts (329).

8. The self-tapping screw bite force detection device according to claim 1, characterized in that: The second pressure detection component (4) further comprises two second downward pressure rods (401) symmetrically mounted on the lower end surface of the lifting plate (211); two cylinders (402) are symmetrically mounted on the inner bottom end of the box body (1); the second downward pressure rods (401) are airtightly slidably connected to the inner wall of the cylinder (402); a U-shaped bracket (403) is fixedly mounted at the inner bottom end of the box body (1) and away from the cylinder (402); an air bag is fixedly mounted at the lower position of the inner wall of the U-shaped bracket (403) (404), an air pressure sensor is arranged in the airbag (404), and the air pressure sensor is connected to the input end signal of the controller. An air outlet (405) is opened on one side of the airbag (404), and the upper end surface of the airbag (404) is connected to the second bellows expansion tube (406), and the upper end surface of the second bellows expansion tube (406) is fixedly installed with a fixing plate (407), and the upper end surface of the fixing plate (407) is fixedly installed with a trigger switch (408), and the trigger switch (408) is connected to the controller signal.

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