Automobile exhaust valve opening and closing force test and spring torque detection device

Abstract

The invention discloses a device for testing the opening and closing force of automobile exhaust pipe valves and detecting spring torque, which includes a pressure testing tool and a spring torque detecting tool; the pressure testing tool includes a first frame, on which a first drive motor and a linear drive mechanism are connected; a first fixing mechanism; a pressure sensor can sense the force value when the valve core is opened at different angles; a control box is used to collect the force value when the pressure sensor senses the valve core at different angles, and test the opening and closing force of the valve core. When the opening and closing force of the valve core does not meet the technical requirements, the control box can control the action of the spring torque detecting tool to correct the spring torque. The device for testing the opening and closing force of automobile exhaust pipe valves and detecting spring torque can accurately test the opening and closing force of the valve, and can feed back the opening and closing force information of the valve to the spring torque detecting device, adjust the spring torque in real time, and improve the qualified rate of the finished valve.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, in particular to an automobile exhaust pipe valve opening and closing force testing and spring torque detection device. Background Art

[0002] The automobile exhaust pipe is a part of the engine exhaust system. The exhaust system mainly includes the exhaust manifold, exhaust pipe, exhaust pipe valve and muffler. Generally, the three-stage catalytic converter for controlling engine pollutant emissions is also installed in the exhaust system. The exhaust pipe valve is an indispensable auxiliary component in the exhaust pipe system. It is widely used in the highest point or elbow or airtight place on the pipeline to discharge the gas in the pipe to clear the pipeline. It can effectively achieve the pressure in the valve exhaust pipe to always maintain within the range of technical requirements, so as to achieve the purpose of normal exhaust work; it is beneficial to improve the engine working efficiency, reduce fuel consumption, environmental pollution and noise, and play a role in energy conservation and emission reduction.

[0003] The prior art automobile exhaust pipe valve, such as the patent application with publication number CN207829979U and titled "Exhaust pipe valve structure", has a structure including a mounting seat installed at the air inlet or outlet of the exhaust cold end silencer of the automobile exhaust pipe, the mounting seat is provided with an opening, and a valve core capable of closing or opening the opening is rotatably connected to the mounting seat, and a spring capable of automatically resetting the valve core is provided on the rotating shaft of the valve core. When the engine is running at a low speed, the valve is in a closed state as a whole, and the exhaust gas is discharged from the orifice tube or the drain pipe. At this time, the pressure is low, and the valve core of the valve is in a closed pressure-maintaining state under the elastic force of the spring; when the engine is running at a high speed, the pressure on one side of the valve core increases, so that the valve core overcomes the elastic force of the spring and opens, and the exhaust gas is discharged from the valve and the orifice tube or the drain pipe. At this time, the pressure is relatively high, and the valve plays a pressure relief role; the valve can keep the pressure in the exhaust pipe in one state; when the exhaust pressure decreases, the elastic force of the torsion spring drives the valve core to rotate to close the valve. Therefore, the setting of the spring plays a vital role in whether the valve can work normally. If the torque of the spring is set too small, the valve core will be easily opened, causing the pressure in the exhaust pipe of the car to be lower than the set pressure value, and the car will make a lot of noise when driving at a low speed; if the torque of the spring is set too large, the valve core will be difficult to open, causing the pressure in the exhaust pipe of the car to be much higher than the set pressure value, and the exhaust pipe will not be smooth, which will affect the service life and working efficiency of the engine.

[0004] The automobile exhaust pipe valve spring needs to be tested for torque during assembly and the opening and closing force of the valve core needs to be tested after the spring is assembled to ensure that the assembled spring meets the requirements of the valve opening and closing force. At present, a fully automatic torsion spring tester is generally used to detect the relationship between the rotation angle and torque during spring assembly, so that when the spring is assembled on the valve, the test result value is used to determine the required assembly angle. Although this method is feasible, due to the difference in the rigidity of each spring, there is also an assembly error when the spring is assembled, so the force value of the valve assembly cannot be guaranteed, and the overall process is more, the efficiency is low, and the qualified rate of the finished valve is low. The opening and closing force test of the valve core is manually tested with a pressure sensor. When a valve that does not meet the requirements is tested, the valve can only be sealed as a defective product, and the opening and closing force test result of the valve core cannot be fed back to the torque detection and assembly station of the spring in real time, resulting in the inability to correct the torque of the spring in time, thereby making the qualified rate of the finished valve low, and the opening and closing force error of the valve manually tested is large. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the above prior art and provide an automobile exhaust pipe valve opening and closing force test and spring torque detection device which can accurately test the opening and closing force of the valve and can feed back the opening and closing force information of the valve to the spring torque detection device, so as to adjust the spring torque in real time and improve the qualified rate of the valve finished product.

[0006] The technical solution of the present invention is to provide an automobile exhaust pipe valve opening and closing force test and spring torque detection device having the following structure: it comprises a pressure test tool and a spring torque detection tool;

[0007] The pressure test tool comprises

[0008] A first frame, on which a first drive motor and a linear drive mechanism are connected, wherein the first drive motor is in transmission connection with the linear drive mechanism and is used to drive the linear drive mechanism to extend and retract;

[0009] A first fixing mechanism, disposed at the bottom of the first frame, for fixing the valve assembly to be tested;

[0010] A pressure sensor, having a pressure rod arranged downward and with its lower end abutting against the valve core of the valve assembly to be tested, wherein the pressure sensor is connected to the linear drive mechanism and is synchronously extended and retracted with the linear drive mechanism, so that the pressure rod can drive the valve core to open at different angles, and the pressure sensor can sense the force value when the valve core opens at different angles;

[0011] The spring torque detection tooling includes

[0012] A second frame, wherein a second driving motor is connected to the second frame;

[0013] A second fixing mechanism is disposed at the bottom of the second frame and is used to fix the valve assembly to be tested;

[0014] The spring cover fixing seat is connected to the lower end of the second drive motor shaft and rotates synchronously with the second drive motor shaft; the spring cover fixing seat is provided with a bayonet for the upper end of the fixing column on which the spring is installed on the valve assembly to pass through, and a working space is provided above the bayonet for the spring cover to be assembled on the upper end of the fixing column and for the spring cover to be connected to the upper end of the spring;

[0015] A clamping mechanism is connected to the spring cover fixing seat, and the clamping mechanism has a clamping block arranged in the working space, and the clamping block is used to press down the spring cover and the spring assembled on the fixing column above the bayonet, and is used to make the spring cover and the upper end of the spring rotate synchronously when the spring cover fixing seat rotates;

[0016] A torque sensor, used to detect the torque of the spring when the shaft of the second drive motor rotates;

[0017] The control box is electrically connected to the pressure sensor, the torque sensor and the second drive motor, and is used to collect the force values ​​sensed by the pressure sensor when the valve core is opened at different angles, and to test the opening and closing force of the valve core. When the opening and closing force of the valve core does not meet the technical requirements, the control box can control the action of the second drive motor, adjust the rotation angle of the spring cover fixing seat, and correct the size of the spring torque.

[0018] Preferably, the linear drive mechanism includes a slide connected to the first frame, the slide is slidably matched with a sliding seat in the height direction, the sliding seat is provided with a threaded hole, a lead screw is threadedly connected to the threaded hole, and the lead screw is transmission-connected to the rotating shaft of the first drive motor; the pressure sensor is connected to the sliding seat.

[0019] Preferably, the first fixing mechanism comprises a support for placing the valve assembly to be tested and two pressing cylinders for pressing the valve assembly to be tested.

[0020] Preferably, both sides of the upper end of the bayonet are provided with limiting steps for supporting the lower end of the spring cover when the pressing block presses the spring cover downward.

[0021] Preferably, the clamping mechanism comprises a vertically arranged clamping cylinder and a slider slidably fitted on a spring cover fixing seat, the lower end of the piston rod of the clamping cylinder is connected to the slider, and the pressure block is connected to the slider and moves synchronously with the slider.

[0022] Preferably, the pressure block is provided with a crimping portion that matches and presses the upper end surface of the bayonet, and the crimping portion has a notch that matches the width of the bayonet. The notch allows the upper end of the spring cover to be exposed, and two clamping arc surfaces that can press the spring cover downward are provided on both sides of the bottom of the notch. The two clamping arc surfaces are symmetrically arranged and the distance between the upper ends is smaller than the distance between the lower ends.

[0023] Preferably, the spring cover fixing seat is provided with a first inclined surface extending into the working space and inclined from top to bottom on one side close to the working space; the outer wall of the pressure block is provided with a second inclined surface matching and fitting with the first inclined surface, and when the pressure block moves downward until the second inclined surface fits with the first inclined surface, a gap is provided between the bottom of the crimping portion and the upper end of the bayonet of the spring cover fixing seat, and the crimping portion presses the spring cover at the upper end of the fixing column.

[0024] Preferably, the second fixing mechanism includes a positioning seat, a support block and a fixed cylinder connected to the bottom of the second frame, the positioning seat is provided with a positioning groove for placing the valve assembly to be tested, and a locking rod is rotatably connected to the support block. The free end of the piston rod of the fixed cylinder is hinged to the first end of the locking rod, and the second end of the locking rod extends toward the positioning groove. When the piston rod of the fixed cylinder pushes the locking rod outward to rotate, the second end of the locking rod can press the valve assembly to be tested placed in the positioning groove.

[0025] Preferably, the second frame is rotatably connected to a transmission light rod coaxial with the rotating shaft of the second drive motor, the upper end of the transmission light rod is connected to the rotating shaft of the second drive motor through a coupling and a reducer, and the lower end of the transmission light rod is connected to the spring cover fixing seat.

[0026] Preferably, the first frame is provided with a lower travel switch and an upper travel switch in sequence from bottom to top, and the lower travel switch and the upper travel switch are electrically connected to the control circuit of the first drive motor, and the sliding seat is provided with a contact block matching the lower travel switch and the upper travel switch.

[0027] After adopting the above structure, the automobile exhaust pipe valve opening and closing force testing and spring torque detection device of the present invention has the following advantages compared with the prior art: when the spring torque detection tool of the automobile exhaust pipe valve opening and closing force testing and spring torque detection device is used, the valve assembly to be detected is first placed in the positioning groove of the positioning seat at the bottom of the second frame, and then the fixing cylinder of the second fixing mechanism drives the locking rod to rotate, so that the locking rod presses the valve assembly to be detected, at this time, the upper end of the fixing column with the spring installed on the valve assembly passes through the bayonet of the spring cover fixing seat, and the staff pre-assembles the spring cover on the upper end of the fixing column in the working space above the bayonet, and makes the spring cover and The clamping foot at the upper end of the spring is engaged; then the pressure block of the clamping mechanism presses the spring cover and the spring downward; the second drive motor runs, driving the spring cover fixing seat and the clamping mechanism to rotate, so that the spring cover and the clamping foot at the upper end of the spring rotate together, and the torque sensor detects the torque applied by the spring to the rotating shaft of the second drive motor in real time, and transmits the torque change signal to the control box, which controls the second drive motor to run or stop running; when the control box detects that the torque of the spring is within the set range, it controls the second drive motor to stop running. At this time, the staff uses a welding gun to weld the spring cover to the upper end of the fixing column, thereby completing the automatic detection and assembly of the torque of the automobile exhaust valve spring. The pressure test tooling of the automobile exhaust valve opening and closing force test and spring torque detection device drives the linear drive mechanism to move through the first drive motor, so that the pressure rod of the pressure sensor can drive the valve core to open different angles. The pressure sensor transmits the force value of the valve core when it opens at different angles to the control box, and the control box determines whether the valve core opening and closing force meets the requirements. If the valve core opening and closing force does not meet the technical requirements, the control box will issue an alarm and feed back the force value of the valve core opening and closing force to the spring torque detection tooling. The control box can control the second drive motor to move, adjust the rotation angle of the spring cover fixing seat, and correct the size of the spring torque to avoid the appearance of unsatisfactory valve assemblies. Therefore, the automobile exhaust pipe valve opening and closing force test and spring torque detection device can not only detect the torque of the spring during the spring assembly process, and adjust the torque of the spring to a predetermined range, and then complete the assembly of the spring, so that the force value of the valve assembly opening is guaranteed, the qualified rate of the valve finished product is improved, and the assembly efficiency is greatly improved; and the opening and closing force of the valve core can be tested according to the pressure test tool, and the test data can be fed back to the spring torque detection tool in real time to adjust the size of the spring torque in real time, that is, when it is detected that the opening and closing force of the valve core does not meet the technical requirements, the control box can control the second drive motor to move, adjust the rotation angle of the spring cover fixing seat, and correct the size of the spring torque. Secondly, the structural setting of the linear drive mechanism of the pressure test tool makes the telescopic movement of the pressure rod more stable, makes the opening and closing force test of the valve core more accurate, and can transmit the force value of the valve core opening and closing at different angles to the control box in real time, so that the control box can accurately judge the size of the valve core opening and closing force.Furthermore, the setting of the limiting steps on both sides of the upper end of the bayonet can not only prevent the spring from being crushed or deformed, but also play a limiting role in the installation position of the spring cover, and can also ensure the synchronous rotation of the spring cover and the spring cover fixing seat, so that the torsion detection of the spring is more accurate; in addition, the setting of the notch of the crimping part on the pressure block and the pressing inclined surface or arc surface at the bottom of the notch makes the spring cover more firmly pressed, avoids displacement or offset during the rotation of the spring cover, and ensures the qualified rate of the finished product of the product. Furthermore, the matching setting of the first inclined surface on the spring cover fixing seat and the second inclined surface on the outer wall of the pressure block makes the pressure block move downward to the second inclined surface and the first inclined surface fit together, and there is a gap between the bottom of the crimping part and the upper end of the bayonet of the spring cover fixing seat. At this time, the crimping part presses the spring cover at the upper end of the fixing column, that is, the setting of the gap, further ensures that the spring is not crushed or deformed during the pressing process of the pressure block, and makes the spring cover pressed more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the automobile exhaust pipe valve opening and closing force test and spring torque detection device of the present invention.

[0029] Figure 2 It is a structural schematic diagram of a pressure testing tool for testing the opening and closing force of an automobile exhaust pipe valve and a spring torque detection device of the present invention.

[0030] Figure 3 The invention is a schematic structural diagram of a spring torque detection tooling of an automobile exhaust pipe valve opening and closing force test and a spring torque detection device.

[0031] Figure 4 It is a structural schematic diagram from another angle of the spring torque detection tooling of the automobile exhaust pipe valve opening and closing force test and spring torque detection device of the present invention.

[0032] Figure 5 The invention is a schematic structural diagram of a spring cover fixing seat of an automobile exhaust pipe valve opening and closing force test and spring torque detection device.

[0033] Figure 6 It is a structural schematic diagram of the second fixing mechanism of the automobile exhaust pipe valve opening and closing force test and spring torque detection device of the present invention.

[0034] As shown in the figure:

[0035] 1. Second frame, 100. Support frame, 101. Base, 2. Second drive motor, 200. Reducer, 201. Coupling, 202. Transmission light rod, 3. Spring cover fixing seat, 300. Bayonet, 301. Limiting step, 302. Guide hole, 303. Working space, 304. First inclined surface, 4. Pressing cylinder, 400. Pressing block, 401. Slider, 402. Notch, 403. Pressing arc surface, 404. Second inclined surface, 405. Gap, 406. Crimping part, 5. Second fixing mechanism, 500. Positioning seat, 501. Support block , 502, locking rod, 503, fixing cylinder, 504, positioning groove, 6, torque sensor, 7, valve assembly, 700, spring, 701, spring cover, 702, valve core, 8, spring torque detection tooling, 9, pressure test tooling, 900, first frame, 901, first drive motor, 902, slide, 903, sliding seat, 904, threaded hole, 905, screw, 906, base plate, 10, control box, 11, pressure sensor, 1100, pressure rod, 12, first fixing mechanism, 1200, support, 1201, clamping cylinder. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] See also Figure 1 to Figure 6 As shown;

[0038] The present invention discloses an opening and closing force testing and spring torque detection device for automobile exhaust pipe valves, which is used to detect the torque of the spring during the assembly process of the valve core spring of the automobile exhaust pipe valve, and adjust the spring torque to within a set torque range to ensure the force value of the valve opening and improve the qualified rate of the valve finished products; and to perform the opening and closing force test of the valve core of the valve assembly equipped with the spring. The automobile exhaust valve opening and closing force test and spring torque detection device comprises a pressure test tool and a spring torque detection tool; the spring torque detection tool comprises a second frame 1, and the second frame 1 is connected to a second drive motor 2; the output end of the shaft of the second drive motor 2 is connected to a reducer 200, and a transmission light rod 202 coaxial with the shaft of the second drive motor 2 is provided below the reducer 200, the upper end of the transmission light rod 202 is connected to the reducer 200 below the shaft of the second drive motor 2 through a coupling 201, and the lower end of the transmission light rod 202 is connected to a spring cover fixing seat 3, and the transmission light rod 202 is rotatably connected to a support frame 100 located on the second frame 1. When the second drive motor 2 is in motion, the spring cover fixing seat 3 can be driven to rotate. The automobile exhaust valve spring torque automatic detection and assembly device also includes a torque sensor 6 for detecting the spring torque when the shaft of the second drive motor 2 rotates, and the torque sensor 6 is connected to the second frame 1 and connected to the shaft of the second drive motor 2. The control box 10 is electrically connected to the second drive motor 2, the clamping mechanism and the torque sensor 6, and is used to receive the spring torque signal transmitted by the torque sensor 6 and control the action of the second drive motor 2. The control box is also called a controller or a computer, which can receive the spring torque signal transmitted by the torque sensor and display the torque change curve of the spring and control the rotation of the shaft of the second drive motor in real time.

[0039] A base 101 is provided at the bottom of the second frame 1, and a second fixing mechanism 5 is connected to the base 101, which is arranged at the bottom of the second frame 1, and the second fixing mechanism 5 is used to fix the valve assembly 7 to be detected; the second fixing mechanism 5 includes a positioning seat 500, a support block 501 and a fixed cylinder 503 connected to the bottom of the second frame 1, and the positioning seat 500 is provided with a positioning groove 504 for placing the valve assembly 7 to be detected, and a locking rod 502 is rotatably connected to the support block 501, and the free end of the piston rod of the fixed cylinder 503 is hinged to the first end of the locking rod 502, and the second end of the locking rod 502 extends toward the positioning groove 504. When the piston rod of the fixed cylinder 503 pushes the locking rod 502 outward to rotate, the second end of the locking rod 502 can press the valve assembly 7 to be detected placed in the positioning groove 504.

[0040] The automobile exhaust valve spring torque automatic detection and assembly device also includes a spring cover fixing seat 3, which is connected to the lower end of the second drive motor 2 shaft and rotates synchronously with the second drive motor 2 shaft; the spring cover fixing seat 3 is provided with a bayonet 300 for the upper end of the fixing column on which the spring 700 is installed on the valve assembly 7 to pass through, and the upper part of the bayonet 300 is provided with a working space 303 for the spring cover 701 to be assembled on the upper end of the fixing column and the spring cover 701 and the upper end of the spring 700 to be connected; a clamping mechanism, connected to the spring cover fixing seat 3, the clamping mechanism has a pressing block 400 arranged in the working space 303, the pressing block 400 is used to press downward the spring cover 701 and the spring 700 assembled on the fixing column above the bayonet 300, and is used to make the spring cover 701 and the upper end of the spring 700 rotate synchronously when the spring cover fixing seat 3 rotates. When the automobile exhaust pipe valve spring torque automatic detection and assembly device is used, the valve assembly 7 to be detected is first placed in the positioning groove 504 of the positioning seat 500 at the bottom of the second frame 1, and then the fixing cylinder 503 of the second fixing mechanism 5 drives the locking rod 502 to rotate, so that the locking rod 502 presses the valve assembly 7 to be detected. At this time, the upper end of the fixing column on which the spring 700 is installed on the valve assembly 7 passes through the bayonet 300 of the spring cover fixing seat 3, and the staff pre-assembles the spring cover 701 on the upper end of the fixing column in the working space 303 above the bayonet 300, and the spring cover 701 is engaged with the clamping foot at the upper end of the spring 700; then the pressing block 40 of the clamping mechanism 0 presses the spring cover 701 and the spring 700 downward; the control box controls the second drive motor 2 to operate, drives the spring cover fixing seat 3 and the pressing mechanism to rotate, so that the spring cover 701 drives the clamping foot at the upper end of the spring 700 to rotate together, and the torque sensor 6 detects the torque applied by the spring on the second drive motor shaft in real time, and transmits the torque change signal to the control box, and the control box controls the second drive motor to operate or stop; when the control box detects that the torque of the spring is within the set range, the second drive motor is controlled to stop operating. At this time, the staff welds the spring cover with the upper end of the fixing column with a welding gun, thereby completing the automatic detection and assembly of the torque of the automobile exhaust pipe valve spring. The automobile exhaust pipe valve spring torque automatic detection and assembly device can detect the torque of the spring during the spring assembly process, and adjust the torque of the spring to a predetermined range, and then complete the assembly of the spring, and the force value of the valve assembly opening is guaranteed, the qualified rate of the valve finished product is improved, and the assembly efficiency is greatly improved.

[0041] See again Figure 1 and Figure 2As shown, the pressure testing tool 9 includes a first frame 900, to which a first drive motor 901 and a linear drive mechanism are connected, and the first drive motor 901 is transmission-connected with the linear drive mechanism to drive the linear drive mechanism to extend and retract; a first fixing mechanism 12 is arranged on a bottom plate 906 at the bottom of the first frame 900, and is used to fix the valve assembly 9 to be tested; a pressure sensor 11 has a pressure rod 1100 arranged downwardly and with the lower end thereof abutting against the valve core 702 of the valve assembly 7 to be tested, and the pressure sensor 11 is connected to the linear drive mechanism and extends and retracts synchronously with the linear drive mechanism. The pressure sensor 11 can sense the force value when the valve core 702 opens at different angles; the control box 10 is electrically connected to the pressure sensor 11, the torque sensor 6 and the second drive motor 2, and is used to collect the force value when the pressure sensor 11 senses the valve core 702 opens at different angles, and test the opening and closing force of the valve core 702. When the opening and closing force of the valve core 702 does not meet the technical requirements, the control box 10 can control the second drive motor 2 to operate, adjust the rotation angle of the spring cover fixing seat 3, and correct the size of the spring torque.

[0042] The pressure testing tooling 9 drives the linear driving mechanism to move through the first driving motor 901, so that the pressure rod 1100 of the pressure sensor 11 can drive the valve core 702 to open different angles, that is, the first driving motor 901 drives the sliding seat 903 to move in the length direction of the lead screw 905, so that the pressure rod 1100 moves downward at intervals of five positions, each position point corresponds to a valve core opening force value, and the pressure sensor 11 transmits the force value of the sensing valve core when it opens at different angles to the control box 10. The control box 10 automatically produces a pressure curve and compares it with the pre-set pressure curve. The control box 10 then determines whether the opening and closing force of the valve core 702 meets the requirements. If the opening and closing force of the valve core 702 does not meet the technical requirements, the control box 10 issues an alarm and feeds back the force value of the opening and closing force of the valve core 702 to the spring torque detection tooling 8. The control box 10 can control the action of the second driving motor, adjust the rotation angle of the spring cover fixing seat 3, and correct the size of the spring torque to avoid the appearance of an unsatisfactory valve assembly. Therefore, the automobile exhaust pipe valve opening and closing force testing and spring torque detection device can not only detect the torque of the spring during the spring assembly process, and adjust the torque of the spring to a predetermined range, and then complete the assembly of the spring, so that the force value of the valve assembly opening is guaranteed, the qualified rate of the valve finished product is improved, and the assembly efficiency is greatly improved; and the opening and closing force of the valve core can be tested according to the pressure test tooling, and the test data can be fed back to the spring torque detection tooling in real time to adjust the size of the spring torque in real time, that is, when it is detected that the opening and closing force of the valve core does not meet the technical requirements, the control box can control the second drive motor to operate, adjust the rotation angle of the spring cover fixing seat, and correct the size of the spring torque.

[0043] See again Figure 2 As shown, as an embodiment of the present invention, the linear drive mechanism includes a slide 902 connected to the first frame 900, and the slide 902 is slidably matched with a slide seat 903 in the height direction. The slide seat 903 is provided with a threaded hole 904, and the threaded hole 904 is internally threaded with a lead screw 905, and the lead screw 905 is connected to the rotating shaft of the first drive motor 901; the pressure sensor 11 is connected to the slide seat 903. The first fixing mechanism 12 includes a support 1200 for placing the valve assembly 7 to be tested and two pressing cylinders 1201 for pressing the valve assembly 7 to be tested. The first frame 900 is provided with a lower stroke switch and an upper stroke switch from bottom to top, and the lower stroke switch and the upper stroke switch are both electrically connected to the control circuit of the first drive motor, and the slide seat 903 is provided with a contact block matching the lower stroke switch and the upper stroke switch. The structural setting of the linear drive mechanism of the pressure testing tooling makes the telescopic movement of the pressure rod smoother, makes the opening and closing force test of the valve core more accurate, and can transmit the force values ​​of the valve core opening and closing at different angles to the control box in real time, so that the control box can accurately judge the size of the valve core opening and closing force.

[0044] See again Figure 3 and Figure 4 As shown, as an embodiment of the present invention, both sides of the upper end of the bayonet 300 are provided with limiting steps 301 for supporting the lower end of the spring cover 701 when the pressing block 400 presses the spring cover 701 downward. The setting of the limiting steps 301 on both sides of the upper end of the bayonet 300 can not only prevent the spring 700 from being crushed or deformed, but also limit the installation position of the spring cover 701, and can also ensure the synchronous rotation of the spring cover and the spring cover fixing seat, so that the torque detection of the spring is more accurate.

[0045] See again Figure 3 to Figure 5As shown, as an embodiment of the present invention, the clamping mechanism comprises a vertically arranged clamping cylinder 4 and a slider 401 slidably fitted on a spring cover fixing seat 3, the spring cover fixing seat 3 is provided with a guide hole 302 extending along the moving direction of the piston rod of the clamping cylinder 4, and the slider 401 slidably fits in the guide hole 302; the lower end of the piston rod of the clamping cylinder 4 is connected to the slider 401, and the pressing block 400 is connected to the slider 401 and moves synchronously with the slider 401. The pressing block 400 is provided with a crimping portion 406 that matches and presses the upper end surface of the bayonet 300, and the crimping portion 406 has a notch 402 that matches the width of the bayonet 300, and the notch 402 allows the upper end of the spring cover 701 to be exposed, and two sides of the bottom of the notch 402 are provided with two pressing inclined surfaces or pressing arc surfaces 403 that can press the spring cover 701 downward. The two pressing inclined surfaces are symmetrically arranged and the distance between the upper ends is smaller than the distance between the lower ends, or the two pressing arc surfaces 403 are symmetrically arranged and the distance between the upper ends is smaller than the distance between the lower ends. The notch 402 of the crimping portion 406 on the pressing block 400 and the setting of the pressing inclined surface or the pressing arc surface 403 at the bottom of the notch 402 make the spring cover more firmly pressed, avoid displacement or offset during the rotation of the spring cover, and ensure the qualified rate of the finished product.

[0046] See again Figure 5 As shown, as an embodiment of the present invention, the spring cover fixing seat 3 is provided with a first inclined surface 304 extending into the working space 303 and tilted from top to bottom on one side close to the working space 303; the outer wall of the pressing block 400 is provided with a second inclined surface 404 matching and fitting with the first inclined surface 304, and when the pressing block 400 moves downward until the second inclined surface 404 fits with the first inclined surface 304, a gap 405 is provided between the bottom of the crimping portion 406 and the upper end of the bayonet 300 of the spring cover fixing seat 3, and the crimping portion 406 presses the spring cover 701 at the upper end of the fixing column. The matching arrangement of the first inclined surface 304 on the spring cover fixing seat 3 and the second inclined surface 404 on the outer wall of the pressing block 400 enables that when the pressing block 400 moves downward until the second inclined surface 404 is in contact with the first inclined surface 304, there is a gap 405 between the bottom of the crimping portion 406 and the upper end of the bayonet 300 of the spring cover fixing seat 3. That is, the arrangement of the gap 405 further ensures that the spring is not crushed or deformed during the downward pressing of the pressing block 400, and the spring cover is compressed more stably.

[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A vehicle exhaust valve opening and closing force test and spring torque detection device, characterized in that: It includes Pressure testing tooling and spring torque testing tooling; the pressure testing tooling includes A first frame, on which a first drive motor and a linear drive mechanism are connected, wherein the first drive motor is in transmission connection with the linear drive mechanism and is used to drive the linear drive mechanism to extend and retract; A first fixing mechanism, disposed at the bottom of the first frame, for fixing the valve assembly to be tested; A pressure sensor, having a pressure rod arranged downward and with its lower end abutting against the valve core of the valve assembly to be tested, wherein the pressure sensor is connected to the linear drive mechanism and is synchronously extended and retracted with the linear drive mechanism, so that the pressure rod can drive the valve core to open at different angles, and the pressure sensor can sense the force value when the valve core opens at different angles; The spring torque detection tooling includes A second frame, wherein a second driving motor is connected to the second frame; A second fixing mechanism is disposed at the bottom of the second frame and is used to fix the valve assembly to be tested; The spring cover fixing seat is connected to the lower end of the second drive motor shaft and rotates synchronously with the second drive motor shaft; the spring cover fixing seat is provided with a bayonet for the upper end of the fixing column on which the spring is installed on the valve assembly to pass through, and a working space is provided above the bayonet for the spring cover to be assembled on the upper end of the fixing column and for the spring cover to be connected to the upper end of the spring; A clamping mechanism is connected to the spring cover fixing seat, and the clamping mechanism has a clamping block arranged in the working space, and the clamping block is used to press down the spring cover and the spring assembled on the fixing column above the bayonet, and is used to make the spring cover and the upper end of the spring rotate synchronously when the spring cover fixing seat rotates; A torque sensor, used to detect the torque of the spring when the shaft of the second drive motor rotates; The control box is electrically connected to the pressure sensor, the torque sensor and the second drive motor, and is used to collect the force values ​​sensed by the pressure sensor when the valve core is opened at different angles, and to test the opening and closing force of the valve core. When the opening and closing force of the valve core does not meet the technical requirements, the control box can control the action of the second drive motor, adjust the rotation angle of the spring cover fixing seat, and correct the size of the spring torque.

2. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 1 is characterized in that: The linear drive mechanism includes a slide connected to the first frame, and the slide is slidably matched with a sliding seat in the height direction of the slide. The sliding seat is provided with a threaded hole, and a lead screw is connected to the rotating shaft of the first drive motor through the threaded hole. The pressure sensor is connected to the sliding seat.

3. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 1 is characterized in that: The first fixing mechanism comprises a support for placing the valve assembly to be tested and two pressing cylinders for pressing the valve assembly to be tested.

4. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 1, characterized in that: Both sides of the upper end of the bayonet are provided with limiting steps for supporting the lower end of the spring cover when the pressing block presses the spring cover downward.

5. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 1 is characterized in that: The clamping mechanism comprises a vertically arranged clamping cylinder and a slider slidably fitted on a spring cover fixing seat, the lower end of the piston rod of the clamping cylinder is connected to the slider, and the pressure block is connected to the slider and moves synchronously with the slider.

6. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 5, characterized in that: The pressing block is provided with a crimping portion that matches and presses the upper end surface of the bayonet. The crimping portion has a notch that matches the width of the bayonet. The notch allows the upper end of the spring cover to be exposed, and two pressing arc surfaces that can press the spring cover downward are provided on both sides of the bottom of the notch. The two pressing arc surfaces are symmetrically arranged and the distance between the upper ends is smaller than the distance between the lower ends.

7. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 6, characterized in that: A first inclined surface extending into the working space and tilted from top to bottom is provided on the side of the spring cover fixing seat close to the working space; a second inclined surface matching and fitting with the first inclined surface is provided on the outer wall of the pressing block, and when the pressing block moves downward until the second inclined surface fits with the first inclined surface, a gap is provided between the bottom of the crimping portion and the upper end of the bayonet of the spring cover fixing seat, and the crimping portion presses the spring cover at the upper end of the fixing column.

8. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 1 is characterized in that: The second fixing mechanism includes a positioning seat, a support block and a fixed cylinder connected to the bottom of the second frame. The positioning seat is provided with a positioning groove for placing the valve assembly to be tested. The support block is rotatably connected to a locking rod. The free end of the piston rod of the fixed cylinder is hinged to the first end of the locking rod, and the second end of the locking rod extends toward the positioning groove. When the piston rod of the fixed cylinder pushes the locking rod outward to rotate, the second end of the locking rod can press the valve assembly to be tested placed in the positioning groove.

9. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 1, characterized in that: The second frame is rotatably connected with a transmission light rod coaxial with the rotating shaft of the second drive motor. The upper end of the transmission light rod is connected to the rotating shaft of the second drive motor through a coupling and a reducer, and the lower end of the transmission light rod is connected to the spring cover fixing seat.

10. The automobile exhaust valve opening and closing force testing and spring torque detection device according to claim 2, characterized in that: The first frame is provided with a lower travel switch and an upper travel switch in sequence from bottom to top, and the lower travel switch and the upper travel switch are both electrically connected to the control circuit of the first drive motor, and the sliding seat is provided with a contact block matching the lower travel switch and the upper travel switch.

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