A system for preventing repeated pullouts

Abstract

The application discloses a system for preventing repeated broaching, and the technical scheme is that a hydraulic control unit is connected to an oil cylinder for driving a broaching tool to move back and forth, the hydraulic control unit comprises a hydraulic control station, an electromagnetic valve group, a first oil pipe and a pressure detection module connected to the first oil pipe and used for detecting oil pressure during retraction of a piston rod of the oil cylinder; the pressure detection module comprises a pressure sensor connected to the first oil pipe and used for detecting a real-time oil pressure value, a pressure analysis unit and an alarm device, the pressure analysis unit is preset with an alarm threshold value, the pressure analysis unit compares the real-time oil pressure value with the alarm threshold value, and when the real-time pressure value is lower than the alarm threshold value, the pressure analysis unit controls the alarm device to send an alarm signal; through oil pressure detection of the first oil pipe and comparison with the threshold value, if the pressure in the first oil pipe is greater than the threshold value, the broaching action is normal; if the pressure in the first oil pipe is less than the threshold value, an alarm is sent to remind that the product is a defective product.

Description

Technical Field

[0001] The present invention relates to a tooth-pulling device, and more specifically, to a system for preventing repeated tooth pulling. Background Technology

[0002] In automotive parts, keyways need to be machined into the round holes of components. The keyways are formed by using a broach.

[0003] The patent application document with application number CN201910600156.6, entitled "Broaching Process for Thin-Walled Internal Spline Shafts", describes in its text that: a broach processes the shaft hole wall of the material, and when the stroke ends, the internal spline of the material is completed.

[0004] During the broaching process, employees may repeat the broaching process on the finished product due to fatigue, negligence, or other factors. When the parts are broached a second time, the keyway spacing formed by the second broaching will be slightly larger, and the processing accuracy will no longer meet the process requirements. However, the workers cannot distinguish it with the naked eye. Therefore, the scrapped parts from the second broaching process will be mixed with the parts from the normal broaching process. Installing the scrapped parts on subsequent products will cause safety hazards when the products are used. Summary of the Invention

[0005] The purpose of this invention is to provide a system to prevent repeated tooth pulling. By detecting the oil pressure in the No. 1 oil pipe and comparing it with a threshold value, if the pressure in the No. 1 oil pipe is greater than the threshold value, it is a normal tooth pulling action; if the pressure in the No. 1 oil pipe is less than the threshold value, an alarm is issued to indicate that it is a defective product.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A system for preventing repeated tooth pulling includes a frame, the frame having a pull cutter and a hydraulic cylinder for driving the pull cutter to move back and forth. The hydraulic cylinder is connected to a hydraulic control unit, which includes: a hydraulic control station, a solenoid valve group connected to the hydraulic control station, a first oil pipe connected to the solenoid valve group for injecting oil into the hydraulic cylinder to control the retraction of the piston rod of the hydraulic cylinder, a second oil pipe connected to the solenoid valve group for returning the oil in the hydraulic cylinder, and a pressure detection module connected to the first oil pipe for detecting the oil pressure during the retraction of the piston rod of the hydraulic cylinder.

[0008] The pressure detection module includes: a pressure sensor connected to the first oil pipe for detecting real-time oil pressure, a pressure analysis unit connected to the pressure sensor, and an alarm device connected to the pressure analysis unit. The pressure analysis unit has a preset alarm threshold. The pressure analysis unit compares the real-time oil pressure with the alarm threshold. When the real-time pressure is lower than the alarm threshold, the pressure analysis unit controls the alarm device to issue an alarm signal.

[0009] By adopting the above technical solution, during the gear broaching process, the hydraulic control station supplies oil to the cylinder through the first oil pipe via the solenoid valve group. The piston rod of the cylinder retracts, and the original oil in the cylinder flows back to the hydraulic control station through the second oil pipe. At the same time, the pressure sensor detects the oil pressure in the first oil pipe in real time and generates a real-time pressure value, which is then transmitted to the pressure analysis unit. The pressure analysis unit compares the real-time pressure value with an alarm threshold. When the real-time pressure value is greater than the alarm threshold, it is in normal working condition, which can ensure the stable progress of the gear broaching process. When the real-time pressure value is less than the alarm threshold, it will cause the gear broaching process to fail. At this time, the pressure analysis unit controls the alarm device to issue an alarm signal to prompt the operator to adjust the equipment in time and reduce the generation of defective products.

[0010] Preferably, the pressure analysis unit is also connected to a timed start module. When the hydraulic control station performs the gear pulling action, it sends a retraction control signal to control the retraction of the oil cylinder. The timed start module is used to control the pressure analysis unit to start at a predetermined time within a predetermined period after receiving the retraction control signal.

[0011] By adopting the above technical solution, the pressure analysis unit can be controlled to perform analysis and comparison when the oil cylinder is performing the tooth pulling action, which can reduce false alarms at the beginning and end of tooth pulling and improve the judgment accuracy.

[0012] Preferably, the alarm device is selected from the following structures, either individually or in combination: a flashing light, a buzzer, or an audible and visual alarm.

[0013] Preferably, the pressure analysis unit is also connected to a timed start module. When the hydraulic control station performs the gear pulling action, it sends a retraction control signal to control the retraction of the oil cylinder. The timed start module is used to control the pressure analysis unit to start at a predetermined time within a predetermined period of time after receiving the retraction control signal.

[0014] By adopting the above technical solution, the pressure analysis unit can be controlled to perform analysis and comparison when the oil cylinder is performing the tooth pulling action, which can reduce false alarms at the beginning and end of tooth pulling and improve the judgment accuracy.

[0015] By adopting the above technical solutions, the flashlight, buzzer, or audible and visual alarm all have good alarm and reminder functions.

[0016] Preferably, the piston rod of the hydraulic cylinder is fixed with a chuck, and the chuck clamps the end of the pull cutter.

[0017] By adopting the above technical solution, the puller can be removed from the chuck.

[0018] Preferably, the frame is threadedly connected to a positioning fixture, which includes two clamping rods for holding the outer wall of the toothed part to be pulled.

[0019] By adopting the above technical solution, the two clamping rods hold the toothed part to be pulled, making it more stable when being pulled and less prone to deviation.

[0020] Preferably, the frame is fixed with a slide bar, the chuck is equipped with a slider, the slider slides on the slide bar, and the slide bar and the piston rod of the hydraulic cylinder are arranged in parallel.

[0021] By adopting the above technical solution, the slide bar has guiding properties, so that when the chuck pulls the cutter, the movement trajectory of the cutter is a smooth straight line.

[0022] Preferably, there are two slide rods, and the piston rod of the hydraulic cylinder is located between the two slide rods.

[0023] By adopting the above technical solution, the two sliding rods guide the slider, making the slider and its movement trajectory more stable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the principle of an embodiment;

[0025] Figure 2 This is a cross-sectional view of the positioning fixture on the frame in the embodiment;

[0026] Figure 3 This is a top view of the positioning fixture on the frame in the embodiment.

[0027] In the picture:

[0028] 1. Frame; 2. Cutting tool; 3. Hydraulic cylinder;

[0029] 41. Hydraulic control station; 42. Solenoid valve assembly; 43. First oil pipe; 44. Second oil pipe;

[0030] 51. Pressure sensor; 52. Pressure analysis unit; 521. Timed start module; 53. Alarm device;

[0031] 6. Positioning fixture; 61. Clamping rod;

[0032] 71. Chuck; 72. Slide bar; 73. Slider;

[0033] 8. Broaching gear. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] An embodiment, a system for preventing repeated tooth pulling, refers to... Figures 1-3The device includes a frame 1, which is equipped with a pull cutter 2 and a hydraulic cylinder 3 that drives the pull cutter 2 to move back and forth. The hydraulic cylinder 3 is connected to a hydraulic control unit, which includes: a hydraulic control station 41, a solenoid valve group 42 connected to the hydraulic control station 41, a first oil pipe 43 connected to the solenoid valve group 42 for injecting oil into the hydraulic cylinder 3 to control the retraction of the piston rod of the hydraulic cylinder 3, a second oil pipe 44 connected to the solenoid valve group 42 for returning the oil in the hydraulic cylinder 3, and a pressure detection module connected to the first oil pipe 43 for detecting the oil pressure during the retraction of the piston rod of the hydraulic cylinder 3.

[0036] Specifically, the pressure detection module includes: a pressure sensor 51 connected to the first oil pipe 43 for detecting real-time oil pressure values, a pressure analysis unit 52 connected to the pressure sensor 51, and an alarm device 53 connected to the pressure analysis unit 52. The pressure analysis unit 52 has a preset alarm threshold. The pressure analysis unit 52 compares the real-time oil pressure value with the alarm threshold. When the real-time pressure value is lower than the alarm threshold, the pressure analysis unit 52 controls the alarm device 53 to issue an alarm signal. The pressure analysis unit 52 can be implemented using an existing microprocessor. In this embodiment, the oil pressure sensor is a high-sensitivity oil pressure sensor. The alarm device 53 is selected from the following structures, either individually or in combination: a flashing light, a buzzer, or an audible and visual alarm. An audible and visual alarm is preferred. In practical applications, the alarm threshold is the range between two oil pressure values. When the real-time pressure value is within this range, it is considered a normal value.

[0037] Furthermore, the pressure analysis unit 52 is also connected to a timed start module 521. When the hydraulic control station 41 performs the tooth pulling action, it sends a retraction control signal to control the retraction of the oil cylinder 3. The timed start module 521 is used to control the pressure analysis unit 52 to start at a predetermined time within a predetermined period after receiving the retraction control signal. This predetermined period can be 0.5-1s from the start of the tooth pulling action to 0.5-1s before the end of the tooth pulling action. In this way, the pressure analysis unit 52 can be controlled to perform analysis and comparison when the oil cylinder 3 performs the tooth pulling action, which can reduce false alarms at the beginning and end of the tooth pulling action and improve the judgment accuracy.

[0038] During gear broaching, the hydraulic control station 41 supplies oil to the cylinder 3 from the first oil pipe 43 via the solenoid valve group 42. The piston rod of the cylinder 3 retracts, and the original oil in the cylinder 3 flows back to the hydraulic control station 41 through the second oil pipe 44. At the same time, the pressure sensor 51 detects the oil pressure in the first oil pipe 43 in real time and generates a real-time pressure value, which is then transmitted to the pressure analysis unit 52. The pressure analysis unit 52 compares the real-time pressure value with an alarm threshold. When the real-time pressure value is greater than the alarm threshold, it is in normal working condition, which can ensure the stable progress of the gear broaching process. When the real-time pressure value is less than the alarm threshold, it will cause the gear broaching to fail. At this time, the pressure analysis unit 52 controls the alarm device 53 to issue an alarm signal to prompt the operator to adjust the equipment in time and reduce the generation of defective products.

[0039] The frame 1 is a metal steel frame structure. Inside the frame 1, a vertically placed hydraulic cylinder 3 is fixed, with the piston rod of the hydraulic cylinder 3 pointing vertically upwards.

[0040] A slider 73 is fixed to the upper end of the piston rod of the hydraulic cylinder 3. Sliding holes are opened at both ends of the slider 73, and a sliding rod 72 is fixed in the sliding hole. The sliding rod 72 is fixed on the frame 1. Since the piston rod and the sliding rod 72 are arranged in parallel, the slider 73 can move back and forth stably under the push of the piston rod.

[0041] A chuck 71 is fixed to the upper end face of the slider 73. The chuck 71 can be hydraulic. The chuck 71 clamps the lower end of the broach 2.

[0042] The frame 1 is threadedly connected to a positioning clamp 6, which includes two clamping rods 61 for clamping the outer wall of the toothed part 8 to be pulled.

[0043] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A system for preventing repeated tooth pulling, comprising a frame (1), the frame (1) being provided with a broach (2) and a hydraulic cylinder (3) for driving the broach (2) to move back and forth, characterized in that: The hydraulic cylinder (3) is connected to a hydraulic control unit. The hydraulic control unit includes: a hydraulic control station (41), a solenoid valve assembly (42) connected to the hydraulic control station (41), a first oil pipe (43) connected to the solenoid valve assembly (42) for injecting oil into the cylinder (3) to control the retraction of the piston rod of the cylinder (3), a second oil pipe (44) connected to the solenoid valve assembly (42) for returning the oil in the cylinder (3), and a pressure detection module connected to the first oil pipe (43) for detecting the oil pressure during the retraction of the piston rod of the cylinder (3); The pressure detection module includes: a pressure sensor (51) connected to the first oil pipe (43) for detecting real-time oil pressure value, a pressure analysis unit (52) connected to the pressure sensor (51), and an alarm device (53) connected to the pressure analysis unit (52). The pressure analysis unit (52) has a preset alarm threshold. The pressure analysis unit (52) compares the real-time oil pressure value with the alarm threshold. When the real-time pressure value is greater than the alarm threshold, it is in normal working condition. When the real-time pressure value is lower than the alarm threshold, the pressure analysis unit (52) controls the alarm device (53) to issue an alarm signal. The pressure analysis unit (52) is also connected to a timed start module (521). When the hydraulic control station (41) performs the gear pulling action, it sends a retraction control signal to control the retraction of the oil cylinder (3). The timed start module (521) is used to control the pressure analysis unit (52) to start at a time within a predetermined period of time after receiving the retraction control signal.

2. A system for preventing repeated tooth pulling according to claim 1, characterized in that: The alarm device (53) is selected from the following structures, either individually or in combination: a flashing light or a buzzer.

3. A system for preventing repeated tooth pulling according to claim 1, characterized in that: The piston rod of the hydraulic cylinder (3) is fixed with a chuck (71), which clamps the end of the broach (2).

4. A system for preventing repeated tooth pulling according to claim 1, characterized in that: The frame (1) is threadedly connected to a positioning clamp (6), which includes two clamping rods (61) for clamping the outer wall of the toothed part (8) to be pulled.

5. A system for preventing repeated tooth pulling according to claim 3, characterized in that: The frame (1) is fixed with a slide rod (72), and the chuck (71) is equipped with a slider (73). The slider (73) slides on the slide rod (72), and the slide rod (72) and the piston rod of the oil cylinder (3) are arranged in parallel.

6. A system for preventing repeated tooth pulling according to claim 5, characterized in that: There are two slide rods (72), and the piston rod of the oil cylinder (3) is located between the two slide rods (72).

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