Rear subframe opening dimension detection mechanism

Abstract

The invention provides a rear auxiliary frame opening dimension detection mechanism, relates to the technical field of dimension detection, and aims to solve the technical problem that a rear auxiliary frame opening dimension detection mechanism in the prior art has the risk of product clamping. A rear subframe opening dimension detection mechanism comprises a supporting seat, a first driving piece, a second driving piece, a connecting piece, a supporting block, a first spring, a displacement sensor and two first detection blocks, the supporting block is fixedly connected with the second driving piece, and the first driving piece is connected to the supporting seat and drives the second driving piece and the supporting block to move left and right. The two first detection blocks are slidably connected to the supporting block in the front-back direction, the first spring is connected between the two first detection blocks, the second driving piece is connected with the connecting piece, the displacement sensor is connected to one first detection block, and a measuring head of the displacement sensor is connected to the other first detection block. When the second driving piece drives the connecting piece to move leftwards or rightwards, the connecting piece enables the two first detection blocks to be close to each other or away from each other.

Description

Technical Field

[0001] The invention relates to the technical field of size detection, in particular to a rear auxiliary frame opening size detection mechanism. Background Art

[0002] As part of the automobile chassis, the rear subframe mainly provides structural support. It also plays an important role in reducing vibration and noise, improving assembly efficiency, and enhancing the safety and comfort of the vehicle. The rear subframe of the automobile is a bracket that supports the front and rear axles and suspension. The opening on the rear subframe is an important installation feature for connecting the suspension. If the opening size is too small, the connecting rod cannot be installed; if the opening size is too large, the design requirements cannot be met and there is a risk of failure. Therefore, it is necessary to test the processing size of the opening.

[0003] like Figure 7 and Figure 8 As shown, the existing opening size detection mechanism: adopts the traditional go / no-go gauge method. When detecting the opening, the product is judged to be qualified by whether the go / no-go gauge can pass or stop. This detection method has the risk of the go / no-go gauge getting stuck in the product when the opening size of the product is at the limit or out of tolerance, so that the inspection fixture does not run smoothly, triggering an alarm and causing the detection to be interrupted; it may even cause damage to the product, and the traditional structure cannot realize the function of quantifying the detection data. Summary of the invention

[0004] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a rear subframe gap size detection mechanism to solve the technical problem that the rear subframe gap size detection mechanism in the prior art has the risk of product jamming.

[0005] In order to solve the above technical problems, the present invention provides a rear subframe opening size detection mechanism, including a support seat, a first driving member, a second driving member, a connecting plate, a support block, a first spring, a displacement sensor and two first detection blocks, the support block is fixedly connected to the second driving member and the support block is located on the left side of the second driving member, the first driving member is connected to the support seat and drives the second driving member and the support block to move left and right, the two first detection blocks are slidably connected to the support block along the front and rear directions, the first spring is connected between the two first detection blocks and drives the two first detection blocks to move away from each other, the second driving member is connected to the connecting plate and drives the connecting plate to move left and right, the displacement sensor is connected to one of the first detection blocks and the probe of the displacement sensor is connected to the other first detection block, when the second driving member drives the connecting plate to move left or right, the connecting plate makes the two first detection blocks move closer to or away from each other.

[0006] After adopting the above structure, a rear subframe opening size detection mechanism of the present invention has the following advantages: the second driving member drives the connecting piece to move so that the two first detection blocks are close to each other, and then the first driving member drives the two first detection blocks to enter the product opening, at this time the second driving member drives the connecting piece to move in the opposite direction, under the action of the first spring, the two first detection blocks move away from each other and respectively stick to the inner walls on both sides of the opening, at this time the displacement sensor can detect the spacing between the two first detection blocks to obtain the opening size, and realize the detection of the opening size, after the detection is completed, the second driving member drives the connecting piece to move so that the two first detection blocks are close again, and finally the first driving member drives the two first detection blocks to leave the opening; during the entire detection process, the first detection blocks will not be stuck with the product, so as to prevent the alarm and detection interruption, and will not cause damage to the product, and at the same time, the displacement sensor can also be used to realize the quantification and data traceability of the opening size detection.

[0007] As an improvement, an open groove is provided at the left end of the connecting piece, and the open groove is symmetrically arranged front to back. The two inner walls of the opening groove in the front and rear directions are both inclined surfaces, and the width of the opening groove in the front and rear directions gradually increases from right to left. A limit pin is provided at the bottom end of each first detection block, and the limit pins of the two first detection blocks respectively abut against the two inner walls in the front and rear directions of the opening groove. When the second driving member drives the connecting piece to move to the left, the connecting piece makes the two first detection blocks move closer to each other. With this structure, the inner wall of the opening groove is set as an inclined surface, which can convert the left and right movement of the connecting piece into the front and rear movement of the two first detection blocks, and cooperate with the first spring to realize the synchronous movement of the two first detection blocks toward or away from each other.

[0008] As an improvement, the support block is connected to a guide shaft arranged along the front-to-back direction, the two first detection blocks are slidably connected to the guide shaft, and the first spring is sleeved on the guide shaft; this structure is adopted to improve the stability and accuracy of the front-to-back movement of the first detection block, and improve the detection accuracy of the opening size.

[0009] As an improvement, the two first detection blocks are slidably connected to the guide shaft through linear bearings; this structure reduces the friction coefficient and achieves sensitive and smooth functions.

[0010] As an improvement, the first detection block includes a detection part and a connecting part that are connected to each other, a first spring is connected between the connecting parts of the two first detection blocks, and a second spring is provided between the detection parts of the two first detection blocks; with this structure, the second spring and the first spring are respectively provided between the detection part and the connecting part of the first detection block, so that the movement of the first detection block as a whole remains uniform, the spacing between the detection parts and the spacing between the connecting parts remain consistent, and the detection accuracy of the opening size is improved.

[0011] As an improvement, the present invention also includes a calibration block, which is provided with a calibration groove for two first detection blocks to enter. The first detection block obtains a reference value by detecting the width of the calibration groove. With this structure, the width of the calibration groove of the calibration block is used as the standard value for zeroing. When detecting the opening size, it is possible to directly judge whether the opening size is qualified from the value of the displacement sensor, making the detection more convenient.

[0012] As an improvement, each first detection block is provided with a mounting hole, in which a spherical bearing is connected, a second detection block is connected to the spherical bearing and the second detection block is located on the outside of the first detection block, a gap is provided between the second detection block and the first detection block so that the second detection block can deflect relative to the first detection block, and the first detection block is provided with a plurality of spring plungers equidistantly arranged around the spherical bearing, each spring plunger abuts against the second detection block, so that the second detection block is arranged parallel to the first detection block; with this structure, the inner wall of the product's opening may be inclined or parallel. When dealing with the parallel situation, the second detection block directly contacts the inner wall of the opening to detect the opening size. When dealing with the inclined situation, due to the setting of the spherical bearing and the spring plunger, the second detection block can deflect and fit the inner wall of the opening, thereby more accurately detecting whether the opening size in the inclined state is qualified.

[0013] As an improvement, the inner end surface of each first detection block is connected to a baffle for covering the spherical bearing and the spring plunger; this structure prevents the spherical bearing and the spring plunger from being exposed, thus playing a dust-proof role.

[0014] As an improvement, a dust cover covering the support block and the displacement sensor is connected to the support block; this structure can protect the support block and the displacement sensor from dust.

[0015] As an improvement, the first driving member is connected to a fixed plate and drives the fixed plate to move left and right, and the second driving member and the support block are fixedly connected to the fixed plate; with this structure, the second driving member and the support block can be synchronously driven by the first driving member by setting the fixed plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention when the dust cover is not installed.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention after the dust cover is installed.

[0018] Figure 3 It is a top view of the present invention when the dust cover is not installed.

[0019] Figure 4 It is a schematic diagram of the structure of the connecting piece and the limiting pin in the present invention.

[0020] Figure 5 It is a schematic diagram of the decomposed structure of the first detection block and the second detection block in the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the calibration block in the present invention.

[0022] Figure 7 It is a structural schematic diagram of a detection mechanism in the prior art.

[0023] Figure 8 This is a structural schematic diagram of a detection mechanism in the prior art for detecting the opening size of a product.

[0024] Figure numerals: 1. support seat; 2. first driving member; 3. second driving member; 4. connecting plate; 5. support block; 6. first spring; 7. displacement sensor; 8. first detection block; 81. detection part; 82. connecting part; 9. opening groove; 10. limit pin; 11. guide shaft; 12. calibration block; 121. calibration groove; 13. second spring; 14. mounting hole; 15. spherical bearing; 16. second detection block; 17. spring plunger; 18. baffle; 19. dust cover; 20. fixing plate. DETAILED DESCRIPTION

[0025] A rear subframe opening size detection mechanism of the present invention is described in detail below with reference to the accompanying drawings.

[0026] like Figures 1 to 6 As shown, a rear subframe opening size detection mechanism includes a support seat 1, a first driving member 2, a second driving member 3, a connecting piece 4, a support block 5, a first spring 6, a displacement sensor 7 and two first detection blocks 8, the support block 5 is fixedly connected to the second driving member 3 and the support block 5 is located on the left side of the second driving member 3, the first driving member 2 is connected to the support seat 1 and drives the second driving member 3 and the support block 5 to move left and right, as shown in FIG. Figure 1 As shown, the first driving member 2 is connected to the fixed plate 20 and drives the fixed plate 20 to move left and right, and the second driving member 3 and the support block 5 are fixedly connected to the fixed plate 20, wherein the first driving member 2 is a pneumatic slide and is arranged at the top of the support seat 1, and the fixed plate 20 is connected to the top of the first driving member 2.

[0027] like Figure 1 As shown, the two first detection blocks 8 are slidably connected to the support block 5 along the front-to-back direction, and the first spring 6 is connected between the two first detection blocks 8 and drives the two first detection blocks 8 to move away from each other. In this embodiment, the support block 5 is a concave structure with left and right openings, such as Figure 3 As shown, the support block 5 is connected to a guide shaft 11 (i.e. Figure 3 In the left and right directions, the two first detection blocks 8 are slidably connected to the guide shaft 11, and the first spring 6 is sleeved on the guide shaft 11.

[0028] In addition, the first detection block 8 includes a detection part 81 and a connecting part 82 that are connected to each other, the first spring 6 is connected between the connecting parts 82 of the two first detection blocks 8, a second spring 13 is provided between the detection parts 81 of the two first detection blocks 8, and the connecting part 82 is slidably connected to the guide shaft 11, and the two first detection blocks 8 are both slidably connected to the guide shaft 11 through linear bearings, specifically, the connecting part 82 is slidably connected to the guide shaft 11 through linear bearings.

[0029] like Figure 3 As shown, the second driving member 3 is connected to the connecting piece 4 and drives the connecting piece 4 to move left and right (i.e. Figure 3 In the up and down directions), the displacement sensor 7 is connected to one of the first detection blocks 8 and the probe of the displacement sensor 7 is connected to the other first detection block 8, the connecting piece 4 is located below the first detection block 8, and when the second driving member 3 drives the connecting piece 4 to move left or right, the connecting piece 4 makes the two first detection blocks 8 move closer to or away from each other.

[0030] Specifically, if Figure 3 and Figure 4 As shown, the left end of the connecting piece 4 (i.e. Figure 4 An opening slot 9 is provided at the upper end of the opening slot 9, which is symmetrically arranged front to back. Both inner walls of the opening slot 9 in the front-to-back direction are inclined surfaces, and the width of the opening slot 9 in the front-to-back direction gradually increases from right to left. A limit pin 10 is provided at the bottom end of each first detection block 8, and the limit pins 10 of the two first detection blocks 8 respectively abut against the two inner walls in the front-to-back direction of the opening slot 9. When the second driving member 3 drives the connecting plate 4 to move to the left, the connecting plate 4 makes the two first detection blocks 8 move closer to each other, wherein the second driving member 3 is a guide cylinder.

[0031] like Figure 2 As shown, a dust cover 19 covering the support block 5 and the displacement sensor 7 is connected to the support block 5; Figure 6 As shown, the present invention further comprises a calibration block 12 , on which a calibration slot 121 is provided for two first detection blocks 8 to enter, and the first detection blocks 8 obtain a reference value by detecting the width of the calibration slot 121 .

[0032] The second driving member 3 drives the connecting piece 4 to move so that the two first detection blocks 8 are close to each other, and then the first driving member 2 drives the two first detection blocks 8 to enter the product opening. At this time, the second driving member 3 drives the connecting piece 4 to move in the opposite direction. Under the action of the first spring 6, the two first detection blocks 8 move away from each other and are respectively attached to the inner walls on both sides of the opening. At this time, the displacement sensor 7 can detect the distance between the two first detection blocks 8 to obtain the opening size, thereby realizing the detection of the opening size. After the detection is completed, the second driving member 3 drives the connecting piece 4 to move so that the two first detection blocks 8 are close to each other again, and finally the first driving member 2 drives the two first detection blocks 8 to leave the opening. During the entire detection process, the first detection blocks 8 will not be stuck with the product, so as to prevent the alarm and detection interruption, and will not cause damage to the product. At the same time, the displacement sensor 7 can also be used to realize the quantification of the opening size detection, and the data traceability can be realized through the product QR code.

[0033] The present invention is a part of an automatic inspection fixture. Before detection, click the zero calibration button on the screen and use the calibration block 12 to zero the present invention. After the zero calibration is completed, press the start button, the lifting mechanism rises, and the product is placed on the limit block of the lifting mechanism. After the laser sensor senses that the product is placed, the cylinder drives the lifting mechanism downward, and the product is smoothly placed in the inspection fixture through the reference component. After the laser sensor senses that the product is placed in place, the clamping component presses the product, and the present invention starts detection.

[0034] When the second driving member 3 pushes the connecting piece 4 to move to the left, it pushes the limit pin 10 to move relatively close, so that the spacing between the first detection blocks 8 becomes smaller; the first driving member 2 starts to run, so that the first detection block 8 moves to the left to the theoretical detection position, that is, the product opening position; the second driving member 3 drives the connecting piece 4 to retreat to the starting position to the right, and the two first detection blocks 8 are stretched outward under the action of the middle first spring 6 until they contact the product opening surface. Through the displacement sensor 7 on the first detection block 8, the displacement of the two first detection blocks 8 is obtained, the size of the opening is calculated, and it is output to the PLC to determine whether the opening size is qualified or not. After the signal transmission is completed, the second driving member 3 pushes the connecting piece 4 to move to the left, and the limit pin 10 at the bottom of the first detection block 8 moves close to the middle, so that the spacing between the first detection blocks 8 becomes smaller; the first driving member 2 drives the first detection block 8 back to the starting position, and the detection is completed. The clamping assembly releases the product, and the lifting mechanism rises upward to drive the product out of the inspection fixture, and the entire detection process is completed.

[0035] The pneumatic components described in the present invention move forward and backward to their full positions, and the magnetic switches installed on the pneumatic components capture signals and transmit them to the PLC. When each group of mechanisms is running, the PLC needs to feedback the execution command before it can run; otherwise, an alarm will be issued and the operation will stop.

[0036] In addition, each first detection block 8 is provided with a mounting hole 14, a spherical bearing 15 is connected in the mounting hole 14, a second detection block 16 is connected to the spherical bearing 15 and the second detection block 16 is located outside the first detection block 8, a gap is provided between the second detection block 16 and the first detection block 8 so that the second detection block 16 can deflect relative to the first detection block 8, and the first detection block 8 is provided with a plurality of spring plungers 17 equidistantly arranged around the spherical bearing 15, each spring plunger 17 abuts against the second detection block 16, so that the second detection block 16 is arranged parallel to the first detection block 8. It should be noted that the second detection block 16 and the first detection block 8 are not necessarily completely parallel, and the two only need to remain relatively parallel.

[0037] The inner end surface of each first detection block 8 is connected with a baffle 18 for covering the spherical bearing 15 and the spring plunger 17. When the inner wall of the opening is tilted, due to the arrangement of the spherical bearing 15 and the spring plunger 17, the second detection block 16 can be deflected and fit the inner wall of the opening, so as to more accurately detect whether the opening size in the tilted state is qualified.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned one embodiment, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A rear subframe opening size detection mechanism, characterized in that: The invention comprises a support seat (1), a first driving member (2), a second driving member (3), a connecting piece (4), a support block (5), a first spring (6), a displacement sensor (7) and two first detection blocks (8), wherein the support block (5) is fixedly connected to the second driving member (3) and the support block (5) is located on the left side of the second driving member (3); the first driving member (2) is connected to the support seat (1) and drives the second driving member (3) and the support block (5) to move left and right; the two first detection blocks (8) are slidably connected to the support block (5) along the front-rear direction; The first spring (6) is connected between the two first detection blocks (8) and drives the two first detection blocks (8) to move away from each other. The second driving member (3) is connected to the connecting piece (4) and drives the connecting piece (4) to move left and right. The displacement sensor (7) is connected to one of the first detection blocks (8) and the probe of the displacement sensor (7) is connected to the other first detection block (8). When the second driving member (3) drives the connecting piece (4) to move left or right, the connecting piece (4) causes the two first detection blocks (8) to move closer to or farther from each other.

2. The rear subframe gap size detection mechanism according to claim 1, characterized in that: An opening slot (9) is provided at the left end of the connecting piece (4), and the opening slot (9) is symmetrically arranged in the front and rear directions. Both inner walls of the opening slot (9) in the front and rear directions are inclined surfaces, so that the width of the opening slot (9) in the front and rear directions gradually increases from right to left. A limit pin (10) is provided at the bottom end of each first detection block (8), and the limit pins (10) of the two first detection blocks (8) respectively abut against the two inner walls in the front and rear directions of the opening slot (9). When the second driving member (3) drives the connecting piece (4) to move leftward, the connecting piece (4) causes the two first detection blocks (8) to move closer to each other.

3. The rear subframe gap size detection mechanism according to claim 1, characterized in that: The support block (5) is connected to a guide shaft (11) arranged in the front-rear direction, the two first detection blocks (8) are slidably connected to the guide shaft (11), and the first spring (6) is sleeved on the guide shaft (11).

4. The rear subframe gap size detection mechanism according to claim 3, characterized in that: The two first detection blocks (8) are both slidably connected to the guide shaft (11) via linear bearings.

5. The rear subframe gap size detection mechanism according to claim 1, characterized in that: The first detection block (8) comprises a detection portion (81) and a connection portion (82) connected to each other, the first spring (6) is connected between the connection portions (82) of two first detection blocks (8), and a second spring (13) is provided between the detection portions (81) of the two first detection blocks (8).

6. The rear subframe gap size detection mechanism according to claim 1, characterized in that: It also comprises a calibration block (12), wherein the calibration block (12) is provided with a calibration slot (121) for two of the first detection blocks (8) to enter, and the first detection block (8) obtains a reference value by detecting the width of the calibration slot (121).

7. The rear subframe gap size detection mechanism according to claim 1, characterized in that: Each of the first detection blocks (8) is provided with a mounting hole (14), a spherical bearing (15) is connected in the mounting hole (14), a second detection block (16) is connected to the spherical bearing (15), and the second detection block (16) is located outside the first detection block (8), a gap is provided between the second detection block (16) and the first detection block (8) so that the second detection block (16) can deflect relative to the first detection block (8), and the first detection block (8) is provided with a plurality of spring plungers (17) equidistantly arranged around the spherical bearing (15) in the circumferential direction, each of the spring plungers (17) abuts against the second detection block (16), so that the second detection block (16) and the first detection block (8) are arranged in parallel.

8. The rear subframe gap size detection mechanism according to claim 7, characterized in that: The inner end surface of each first detection block (8) is connected to a baffle (18) for covering the spherical bearing (15) and the spring plunger (17).

9. The rear subframe gap size detection mechanism according to claim 1, characterized in that: The support block (5) is connected to a dust cover (19) that covers the support block (5) and the displacement sensor (7).

10. The rear subframe gap size detection mechanism according to claim 1, characterized in that: The first driving member (2) is connected to a fixed plate (20) and drives the fixed plate (20) to move left and right, and the second driving member (3) and the supporting block (5) are both fixedly connected to the fixed plate (20).

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