A spiral wire detection instrument

Abstract

The present invention provides a spiral line detection instrument, which includes a main transmission mechanism, a mobile end mechanism, a measuring system, and a working platform. The main transmission mechanism is fixedly connected to the working platform, and the mobile end mechanism is movably arranged on the working platform. The main transmission mechanism and the mobile end mechanism are respectively provided with a first ejector pin and a second ejector pin, the central axes of the first ejector pin and the second ejector pin are on the same straight line, and the needle tips of the first ejector pin and the second ejector pin stand facing each other. The measuring system is movably arranged on the working platform and is located on the side of the main transmission mechanism and the mobile end mechanism. The measuring system includes a camera, a light source, a slide, and a second guide rail. The second guide rail is fixedly connected to the working platform and is parallel to the second first guide rail. The lower end of the slide is arranged on the second guide rail and the upper end is provided with a camera and a light source. The present invention performs forward and reverse measurement, and the measurement result automatically filters out the moving distance during acceleration and deceleration, thereby ensuring the validity of the result.

Description

Technical Field

[0001] The invention relates to the field of detection equipment, and in particular to a spiral wire detection instrument. Background Art

[0002] At present, in mechanical manufacturing, serious spiral texture structures often appear on the rotary sealing surface of shaft parts, which will cause leakage of the working medium in the inner cavity of powertrain products, thus causing quality risks. The surface texture requirements of some shaft parts are relatively high, and spiral lines are not allowed when used, otherwise they cannot meet the use requirements. Therefore, the processed parts need to be tested for the presence of spiral lines before assembly, but the equipment for detecting the surface of shaft parts is not yet perfect. Summary of the invention

[0003] The invention provides a spiral line detection instrument to solve the problem of inaccurate spiral line detection of shaft parts in the prior art.

[0004] In order to solve the above technical problems, the present invention provides a spiral wire detection instrument, which includes a main transmission mechanism, a mobile end mechanism, a measuring system, and a working platform. The main transmission mechanism is fixedly connected to the working platform, and the mobile end mechanism is movably arranged on the working platform. The main transmission mechanism and the mobile end mechanism are respectively provided with a first ejector pin and a second ejector pin. The central axes of the first ejector pin and the second ejector pin are on the same straight line and the needle tips of the first ejector pin and the second ejector pin face each other. The measuring system is movably arranged on the working platform and is located on the sides of the main transmission mechanism and the mobile end mechanism.

[0005] Preferably, the main transmission mechanism also includes a first bushing, a fixed-end bearing seat, and a motor. The fixed-end bearing seat is fixedly connected to the working platform, the first ejector is fixed to the fixed-end bearing seat through the first bushing, the end of the first ejector away from the needle tip is connected to the motor, a reducer is arranged between the end of the first ejector away from the needle tip and the motor, and a bearing seat adjustment pad is arranged at the bottom of the fixed-end bearing seat.

[0006] Preferably, the mobile end mechanism also includes a second bushing, a mobile end bearing seat, a coupling, an encoder, and two first guide rails, the two first guide rails are fixedly connected to the working platform, a slider compatible with the two first guide rails is provided at the bottom of the mobile end bearing seat, the second ejector pin is connected to the mobile end bearing seat through the second bushing, and the end of the second ejector pin away from the needle tip is connected to the encoder through the coupling.

[0007] Preferably, a U-shaped block is provided on the end of the movable end bearing seat away from the second ejector needle tip, the lip of the U-shaped block faces the movable end bearing seat and a threaded hole is provided at the bottom, one end of the tightening screw is screwed into the threaded hole and the other end is screwed onto the locking seat through a thread.

[0008] Preferably, the other end of the tightening screw is screwed onto the locking seat through a thread and extends out of the locking seat to be fixedly connected to the screw handle.

[0009] Preferably, the locking seat is placed between the two first guide rails, and the locking seat is provided with a latch hole adapted to the latch, and the working platform is also provided with a row of fixed pin holes adapted to the latch, so that the locking seat can be tightly fixed in place by the latch when it moves to different positions with the mobile end mechanism.

[0010] Preferably, the pressure sensor is connected to the movable end bearing seat via a sensor connecting block, and the pressure sensor is located below the needle tip of the second ejector pin.

[0011] Preferably, the measuring system includes a camera, a light source, a slide, and a second guide rail, the second guide rail is fixedly connected to the working platform and is parallel to the two first guide rails, the lower end of the slide is arranged on the second guide rail and the camera and the light source are arranged on the upper end, and a locking handle is arranged at the lower part of the slide, the locking handle is connected to a stud, and the stud can be rotatably abutted against the outer edge of the second guide rail.

[0012] Preferably, the spiral wire detection instrument also includes a display screen and a control system, and the motor, the pressure sensor, the encoder, the camera and the display screen are all electrically connected to the control system.

[0013] A detection method for a spiral wire detection instrument comprises the following steps:

[0014] The first step is to place the shaft part between the first ejector pin and the second ejector pin, push the moving end mechanism to move forward along the second first guide rail until the second ejector pin contacts the shaft part, and insert the latch pin into the latch pin hole and the fixed pin hole from top to bottom to lock the locking seat. Rotate the screw handle to move the moving end mechanism forward, and apply a pressure to the shaft part. This pressure can be transmitted to the display screen through the pressure sensor. This pressure is determined according to needs. When the set pressure is reached, stop rotating the screw handle.

[0015] Step 2: Clean the surface to be tested, and hang cotton thread and weights. Tie the cotton thread into a loop and put it around the middle of the oil cover of the part to be tested. The arc length between the tangent to the shaft surface should be between 220-240°. Tie the lower end of the cotton thread to the weight. The weight of the weight should be between 10-15g.

[0016] Step 3: Move the camera and select the camera position that produces the clearest image.

[0017] Step 4: Start the device and rotate the motor clockwise for 10 turns. Use the camera to detect the initial and final positions of the cotton thread and calculate the distance between them. The measurement results automatically filter out the moving distance during acceleration and deceleration to ensure the validity of the results, and the measurement accuracy reaches 0.01mm.

[0018] Step 5: Make the motor rotate counterclockwise for 10 turns, detect the initial position and the end position of the cotton thread through the camera, and calculate the distance between the initial position and the end position of the cotton thread.

[0019] Step 6: According to (φ is the lead angle, Xt is the displacement length of the line, D is the oil seal diameter, and N is the number of rotations) Calculate the lead angle.

[0020] Beneficial effects of the present invention: The present invention provides a spiral line detection instrument, which places the shaft part between the first ejector pin and the second ejector pin. The pressing force is transmitted to the display screen through the pressure sensor, and the pressing force can be set as needed. The measurement is performed in both forward and reverse directions, and the moving distance during acceleration and deceleration is automatically filtered out of the measurement result, ensuring the validity of the result, and the measurement accuracy reaches 0.01mm. The information feedback of the grating rotary encoder ensures that the set speed is consistent with the actual speed, so that the entire transmission mechanism forms a closed loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of a spiral wire detection instrument according to an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the overall structure of the main transmission mechanism of the spiral wire detection instrument according to an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the overall structure of the mobile terminal mechanism of the spiral wire detection instrument according to an embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the overall structure of the mobile terminal mechanism of the spiral wire detection instrument according to an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the overall structure of a measuring system of a spiral wire detection instrument according to an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of cotton thread placement of a spiral line detection instrument according to an embodiment of the present invention.

[0027] Among them, 1-main transmission mechanism, 101-first ejector, 102-first sleeve, 103-fixed end bearing seat, 104-reducer, 105-motor, 106-bearing seat adjustment pad, 2-movable end mechanism, 201-second ejector, 202-second sleeve, 203-movable end bearing seat, 204-coupling, 205-encoder, 206-first guide rail, 207-tightening screw, 208-U-shaped block, 209-pin, 210-screw handle, 211-locking seat, 212-pressure sensor, 213-sensor connecting block, 3-measuring system, 301-camera, 302-light source, 303-slide, 304-locking handle, 305-second guide rail, 4-working platform, 5-weight, 6-oil cover. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figures 1 to 5 As shown, the present invention provides a spiral wire detection instrument, which includes a main transmission mechanism 1, a mobile end mechanism 2, a measuring system 3, and a working platform 4. The main transmission mechanism 1 is fixedly connected to the working platform 4, the mobile end mechanism 2 is movably arranged on the working platform 4, and the main transmission mechanism 1 and the mobile end mechanism 2 are respectively provided with a first ejector pin 101 and a second ejector pin 201. Both the first ejector pin 101 and the second ejector pin 201 are Morse ejectors, and the central axes of the first ejector pin 101 and the second ejector pin 201 are on the same straight line and the needle tip of the first ejector pin 101 and the needle tip of the second ejector pin 201 face each other. The measuring system 3 is movably arranged on the working platform 4 and is located on the sides of the main transmission mechanism 1 and the mobile end mechanism 2. As shown Figure 6 As shown, during the test, the shaft parts are placed between the first ejector pin 101 and the second ejector pin 201, the cotton thread is tied into a loop and put around the middle position of the oil cover 6 of the part to be tested, the arc length between the tangent to the shaft surface should be between 220-240°, the lower end of the cotton thread is tied to the weight, the weight of the weight 5 is between 10-15g, and the length of A is approximately 0.7D (D is the diameter of the oil cover).

[0031] The main transmission mechanism 1 also includes a first sleeve 102, a fixed-end bearing seat 103, and a motor 105. The fixed-end bearing seat 103 is fixedly connected to the working platform 4. The first ejector pin 101 is fixed to the fixed-end bearing seat 103 through the first sleeve 102. The end of the first ejector pin 101 away from the needle tip is connected to the motor 105. The motor 105 is a servo motor. The first ejector pin 101 can rotate when driven by the motor 105.

[0032] A reducer 104 is disposed between the end of the first ejector 101 away from the needle tip and the motor 105 . The reducer 104 is a planetary reducer for adjusting the rotation speed of the first ejector 101 .

[0033] A bearing seat adjustment pad 106 is provided at the bottom of the fixed end bearing seat 103 , and the bearing seat adjustment pad 106 is used to adjust the position of the fixed end bearing seat 103 so that the first ejector pin 101 and the second ejector pin 201 clamp the part to be tested.

[0034] The mobile end mechanism 2 also includes a second sleeve 202, a mobile end bearing seat 203, a coupling 204, an encoder 205, and two first guide rails 206. The two first guide rails 206 are fixedly connected to the working platform 4, and a slider adapted to the two first guide rails 206 is provided at the bottom of the mobile end bearing seat 203, so that the mobile end mechanism 2 can move toward or away from the main transmission mechanism 1 on the working platform 4. The second ejector pin 201 is connected to the mobile end bearing seat 203 through the second sleeve 202, and the end of the second ejector pin 201 away from the needle tip is connected to the encoder 205 through the coupling 204. The encoder 205 is a grating rotary encoder, and the encoder 205 can be used to feedback the real-time rotation speed and display the rotation speed on the display screen.

[0035] A U-shaped block 208 is provided on one end of the movable end bearing seat 203 away from the needle tip of the second ejector pin 201. The lip of the U-shaped block 208 faces the movable end bearing seat 203 and a threaded hole is provided at the bottom. One end of the jacking screw 207 is screwed into the threaded hole and the other end is screwed onto the locking seat 211 through a thread. The jacking screw 207 connects the movable end mechanism 2 and the locking seat 211 together. When the jacking screw 207 is stationary, the movable end mechanism 2 and the locking seat 211 do not produce relative movement. When the jacking screw 207 moves forward or backward, it can push the movable end mechanism 2 away from or toward the locking seat 211.

[0036] The other end of the tightening screw 207 is screwed onto the locking seat 211 through a thread and extends out of the locking seat 211 to be fixedly connected to the screw handle 210. Rotating the screw handle 210 can make the tightening screw 207 move forward or backward.

[0037] The locking seat 211 is placed between the two first guide rails 206, and a latch hole matching the latch 209 is provided on the locking seat 211. A row of fixed pin holes matching the latch 209 is also provided on the working platform 4, so that the locking seat 211 can be fixed in place by the latch 209 when the mobile end mechanism 2 moves to different positions. The shaft parts are placed between the first ejector pin 101 and the second ejector pin 201, and the mobile end mechanism 2 is manually pushed forward along the two first guide rails 206 until the second ejector pin 201 hits the shaft parts, and the latch pin 209 is inserted into the latch hole and the fixed pin hole from top to bottom in turn to lock the locking seat 211. The rotating screw handle 210 makes the mobile end mechanism 2 move forward, and a pressure is applied to the shaft parts. This pressure can be transmitted to the display screen through the pressure sensor 212. This pressure is determined according to needs. When the set pressure is reached, the rotating screw handle 210 is stopped.

[0038] The pressure sensor 212 is connected to the movable end bearing seat 203 via a sensor connecting block 213 , and the pressure sensor 212 is located below the needle tip of the second ejector pin 201 .

[0039] The measuring system 3 includes a camera 301, a light source 302, a slide 303, and a second guide rail 305. The second guide rail 305 is fixedly connected to the working platform 4 and is parallel to the second first guide rail 206. The lower end of the slide 303 is arranged on the second guide rail 305 and the upper end is provided with the camera 301 and the light source 302. The lower part of the slide 303 is provided with a locking handle 304, and the locking handle 304 is connected to a stud, and the stud can be rotated to contact the outer edge of the second guide rail 305. The distance between the initial position and the end position of the cotton thread is detected by the camera 301, and the lead angle is calculated by substituting it into the formula. The light source is used to ensure the brightness of the detection area. Due to the different positions of the test surfaces of various workpieces, the different focal lengths and positions of the camera 301 need to be adjusted by the slide 303 and the second guide rail 305.

[0040] A spiral wire detection instrument provided by the present invention also includes a display screen and a control system. The motor 105, the pressure sensor 212, the encoder 205, the camera 301, and the display screen are all electrically connected to the control system to achieve automatic control of the spiral wire detection instrument.

[0041] Example 2

[0042] The measuring system 3 includes a camera 301, a light source 302, a slide 303, a second guide rail 305, and a locking handle 304. The second guide rail 305 is fixedly connected to the working platform 4. The lower end of the slide 303 is arranged on the second guide rail 305 and the upper end is provided with the camera 301 and the light source 302. The lower part of the slide 303 is provided with a locking handle 304, and the locking handle 304 is connected to a stud, and the stud can be rotated to contact the outer edge of the second guide rail 305. The distance between the initial position and the end position of the cotton thread is detected by the camera 301, and the lead angle is calculated by substituting it into the formula. The light source is used to ensure the brightness of the detection area. Due to the different positions of the test surfaces of various workpieces, the different focal lengths and positions of the camera 301 need to be adjusted by the slide 303 and the second guide rail 305.

[0043] The operating steps of a spiral wire detection instrument provided by the present invention are as follows:

[0044] The first step is to place the shaft part between the first ejector pin and the second ejector pin, manually push the moving end mechanism forward along the second first guide rail until the second ejector pin contacts the shaft part, and insert the latch pin into the latch pin hole and the fixed pin hole from top to bottom to lock the locking seat. Rotate the screw handle to move the moving end mechanism forward, and apply a pressure to the shaft part. This pressure can be transmitted to the display screen through the pressure sensor. This pressure is determined according to needs. When the set pressure is reached, stop rotating the screw handle.

[0045] Step 2: Clean the surface to be tested, and hang cotton thread and weights. Tie the cotton thread into a loop and put it around the middle of the oil cover of the part to be tested. The arc length between the tangent to the shaft surface should be between 220-240°. Tie the lower end of the cotton thread to the weight. The weight of the weight should be between 10-15g.

[0046] Step 3: Move the camera and select the camera position that produces the clearest image.

[0047] Step 4: Start the device and rotate the motor clockwise for 10 turns. Use the camera to detect the initial and final positions of the cotton thread and calculate the distance between them. The measurement results automatically filter out the moving distance during acceleration and deceleration to ensure the validity of the results, and the measurement accuracy reaches 0.01mm.

[0048] Step 5: Make the motor rotate counterclockwise for 10 turns, detect the initial position and the end position of the cotton thread through the camera, and calculate the distance between the initial position and the end position of the cotton thread.

[0049] Step 6: According to (φ is the lead angle, Xt is the displacement length of the line, D is the oil seal diameter, and N is the number of rotations) Calculate the lead angle. When rotating clockwise, the line moves to the right, which is right-handed; when rotating counterclockwise, the line moves to the left, which is left-handed; there is no axial movement in both clockwise and counterclockwise directions, and there is no spiral line; the axial movement directions of clockwise and counterclockwise are the same, and the measurement is invalid.

[0050] In summary, the spiral wire detection instrument provided by the present invention places the shaft parts between the first ejector pin and the second ejector pin, and the pressing force is transmitted to the display screen through the pressure sensor, and the pressing force can be set as needed. Forward and reverse measurement, the measurement result automatically filters out the moving distance during acceleration and deceleration, ensuring the validity of the result, and the measurement accuracy reaches 0.01mm. The information feedback of the grating rotary encoder ensures that the set speed is consistent with the actual speed, so that the entire transmission mechanism forms a closed loop.

[0051] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A spiral wire detection instrument, characterized in that: The spiral line detection instrument comprises a main transmission mechanism (1), a mobile end mechanism (2), a measuring system (3), and a working platform (4); the main transmission mechanism (1) is fixedly connected to the working platform (4); the mobile end mechanism (2) is movably arranged on the working platform (4); the main transmission mechanism (1) and the mobile end mechanism (2) are respectively provided with a first ejector pin (101) and a second ejector pin (201); the central axes of the first ejector pin (101) and the second ejector pin (201) are on the same straight line and the central axes of the first ejector pin (101) and the second ejector pin (201) are on the same straight line. The needle tip of the first ejector pin (101) and the needle tip of the second ejector pin (201) are positioned facing each other; the measuring system (3) is movably arranged on the working platform (4) and is located on the side of the main transmission mechanism (1) and the movable end mechanism (2); a part to be measured is arranged between the first ejector pin (101) and the second ejector pin (201); a cotton thread loop is sleeved at the middle position of the oil cover (6) of the part to be measured; a weight (5) is attached to the lower end of the cotton thread loop; and the measuring system (3) is used to detect the initial position and the end position of the cotton thread loop.

2. The spiral wire detection instrument according to claim 1, characterized in that: The main transmission mechanism (1) further comprises a first shaft sleeve (102), a fixed end bearing seat (103), and a motor (105); the fixed end bearing seat (103) is fixedly connected to the working platform (4); the first ejector pin (101) is fixed to the fixed end bearing seat (103) via the first shaft sleeve (102); an end of the first ejector pin (101) away from the needle tip is connected to the motor (105); a reducer (104) is arranged between the end of the first ejector pin (101) away from the needle tip and the motor (105); and a bearing seat adjustment pad (106) is arranged at the bottom of the fixed end bearing seat (103).

3. The spiral wire detection instrument according to claim 2, characterized in that: The mobile end mechanism (2) further comprises a second shaft sleeve (202), a mobile end bearing seat (203), a coupling (204), an encoder (205), and two first guide rails (206); the two first guide rails (206) are fixedly connected to the working platform (4); a slider adapted to the two first guide rails (206) is arranged at the bottom of the mobile end bearing seat (203); the second ejector pin (201) is connected to the mobile end bearing seat (203) via the second shaft sleeve (202); and an end of the second ejector pin (201) away from the needle tip is connected to the encoder (205) via the coupling (204).

4. The spiral wire detection instrument according to claim 3, characterized in that: A U-shaped block (208) is arranged on one end of the movable end bearing seat (203) away from the needle tip of the second ejector pin (201); the lip of the U-shaped block (208) faces the movable end bearing seat (203) and a threaded hole is arranged at the bottom; one end of the tightening screw (207) is screwed into the threaded hole and the other end is screwed onto the locking seat (211) through a thread.

5. The helical wire detection instrument according to claim 4, characterized in that: The other end of the tightening screw rod (207) is screwed onto the locking seat (211) through a thread and extends out of the locking seat (211) to be fixedly connected to the screw rod handle (210).

6. The spiral wire detection instrument according to claim 5, characterized in that: The locking seat (211) is placed between the two first guide rails (206), and a latch hole matched with the latch (209) is provided on the locking seat (211). The working platform (4) is also provided with a row of fixed pin holes matched with the latch (209), so that the locking seat (211) can be fixed in place by the latch (209) when the moving end mechanism (2) moves to different positions.

7. The spiral wire detection instrument according to claim 6, characterized in that: The pressure sensor (212) is connected to the movable end bearing seat (203) via a sensor connection block (213), and the pressure sensor (212) is located below the needle tip of the second ejector pin (201).

8. The helical wire detection instrument according to claim 7, characterized in that: The measuring system (3) comprises a camera (301), a light source (302), a slide (303), and a second guide rail (305); the second guide rail (305) is fixedly connected to the working platform (4) and is parallel to the two first guide rails (206); the lower end of the slide (303) is arranged on the second guide rail (305) and the upper end is provided with the camera (301) and the light source (302); a locking handle (304) is arranged at the lower part of the slide (303); the locking handle (304) is connected to a stud, and the stud can be rotated to contact the outer edge of the second guide rail (305).

9. The spiral wire detection instrument according to claim 8, characterized in that: The spiral wire detection instrument also includes a display screen and a control system, and the motor (105), the pressure sensor (212), the encoder (205), the camera (301), and the display screen are all electrically connected to the control system.

10. A detection method using the spiral wire detection instrument according to claim 1, characterized in that: The following steps are involved: The first step is to place the shaft part between the first ejector pin and the second ejector pin, push the moving end mechanism to move forward along the second first guide rail until the second ejector pin contacts the shaft part, and insert the latch pin into the latch pin hole and the fixed pin hole from top to bottom to lock the locking seat. Rotate the screw handle to move the moving end mechanism forward, and apply pressure to the shaft part. This pressure can be transmitted to the display screen through the pressure sensor. This pressure is determined according to needs. When the set pressure is reached, stop rotating the screw handle; Step 2: Clean the surface to be tested, and hang cotton thread and weights. Tie the cotton thread into a loop and put it around the middle of the oil cover of the part to be tested. The arc length between the tangent to the shaft surface should be between 220-240°. Tie the lower end of the cotton thread to the weight. The weight of the weight should be between 10-15g. Step 3: Move the camera and select the position that produces the clearest image. Step 4: Start the equipment and make the motor rotate clockwise for 10 turns. Use the camera to detect the initial and final positions of the cotton thread and calculate the distance between them. The measurement results automatically filter out the moving distance during acceleration and deceleration to ensure the validity of the results. The measurement accuracy reaches 0.01mm. Step 5: Make the motor rotate counterclockwise for 10 turns, detect the initial position and the end position of the cotton thread through the camera, and calculate the distance between the initial position and the end position of the cotton thread; Step 6: According to Among them, φ is the lead angle, Xt is the displacement length of the line, D is the oil cover diameter, and N is the number of rotations.

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