An automatic detection device for a trailer hitch

Abstract

The present invention provides an automatic detection device for a trailer hitch, belonging to the technical field of automotive component detection. The automatic detection device for the trailer hitch includes a bottom plate, a positioning fixture, and a detection mechanism. The detection mechanism includes a mounting block fixed on the bottom plate, a vertical plate, a swing block swingably connected to the mounting block, a contour plate fixed on the swing block, a rotating plate rotatably connected to the vertical plate through a rotating shaft, a cylinder fixed on the rotating plate, a pulling seat on the rotating plate, a square straight rod passing through the pulling seat, two sides of the front end of the square straight rod are respectively provided with square frames vertically connected to the square straight rod, a slide rail is fixed in the square frame, a slide seat and a first spring are sleeved on the slide rail, a limiting block is provided at the upper end of the detection rod, a second spring is sleeved on the detection rod, a passing round rod portion is provided at the lower end of the detection rod, and a stopping round rod portion is connected to the lower end of the passing round rod portion. After the trailer hitch is installed and positioned, the cylinder is activated for automatic detection, avoiding deviation in the detection result caused by manual operation of the detection rod by workers.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive parts detection, and relates to an automatic detection device for a trailer hitch. Background Art

[0002] Trailer hitches are mainly used for the connection and towing between vehicles. The original design intention of trailer hitches is to facilitate the towing and other rescue operations of vehicles in emergency situations. It can connect two vehicles and pull the towed vehicle through the towing vehicle to achieve the movement of the vehicle. Trailer hitches are also very useful in emergency situations. For example, on snowy, desert or other difficult-to-drive roads, a malfunctioning vehicle can be towed out of the dangerous area. Trailer hitches need to meet the standard requirements of automotive towing devices, and tests on tensile, compressive and anti-deformation properties are required. First of all, the dimensions of the outer contour must meet the production requirements. The existing method is to make a gauge with a hole and groove larger than the outer contour of the trailer hitch. There is a gap between the hole and groove contour of the gauge and the trailer hitch, and the gap needs to be within the qualified numerical range to ensure the size of the trailer hitch. The inspector holds a go-no-go gauge to manually detect this gap. This kind of gauge is relatively backward, and the hand strength of the inspector cannot be kept consistent, resulting in deviation of the detection data and the detection accuracy cannot be effectively guaranteed. Summary of the Invention

[0003] The purpose of the present invention is to address the above problems existing in the prior art, and propose an automatic detection device for a trailer hitch, which can automatically detect whether the outer contour of the trailer hitch is qualified and has high detection accuracy.

[0004] The purpose of the present invention can be achieved by the following technical solutions: An automatic detection device for a trailer hitch, comprising a bottom plate, a positioning fixture and a detection mechanism. The positioning fixture includes a bushing seat fixed on the bottom plate for the tail of the trailer hitch to insert, a pressing component for pressing the trailer hitch towards the bushing seat, and a clamping component for horizontally clamping the front end of the trailer hitch. The detection mechanism includes a mounting block, a vertical plate fixed on the bottom plate, a swing block swingably connected to the mounting block, a contour plate fixed on the swing block. The contour plate is provided with a detection hole for the trailer hitch to be embedded, and there is a gap between the outer contour of the trailer hitch and the detection hole. A rotating plate is rotatably connected to the vertical plate through a rotating shaft. A cylinder is fixed on the rotating plate. There is a pulling seat on the rotating plate. A square straight rod passes through the pulling seat. The cylinder is connected to the tail of the square straight rod and drives the square straight rod to move back and forth. On both sides of the front end of the square straight rod, there are respectively square frames vertically connected to the square straight rod. A slide rail is fixed inside the square frame. A slide seat and a first spring are sleeved on the slide rail. Under the action of the first spring, the slide seat moves towards the square straight rod. A detection rod that can move up and down is vertically penetrated through the slide seat. A limiting block is provided at the upper end of the detection rod. A second spring is sleeved on the detection rod. The upper end of the second spring abuts against the limiting block, and the lower end of the second spring abuts against the slide seat. A passing round rod portion is provided at the lower end of the detection rod, and a stopping round rod portion is connected to the lower end of the passing round rod portion.

[0005] The front end of the detection hole is open, and the contour of the detection hole is larger than the outer contour of the trailer hitch with qualified dimensions. Therefore, the gap between the outer contour of the qualified trailer hitch and the detection hole is equidistant. The diameter of the stop round rod part is larger than that of the passing round rod part, and the stop round rod part and the passing round rod part are coaxially arranged. The pressing component presses the trailer hitch inside the bushing seat to prevent the trailer hitch from having a horizontal displacement. The clamping component clamps one side of the front end of the trailer hitch to prevent the trailer hitch from rotating around the axis line direction. The cylinder pulls the detection rod to move along the gap between the trailer hitch and the detection hole. The first spring makes the passing round rod part at the lower end of the detection rod abut against the outer contour of the trailer hitch. When the gap is too small, the passing round rod part will be stuck and unable to move forward, indicating that the contour dimension of the trailer hitch is larger than the qualified value. And the second spring makes the upper ends of the stop round rod part respectively abut against the edges of the trailer hitch and the detection hole. When the gap is too large, the stop round rod part can pass through the gap, causing the entire detection rod to be pushed up by the second spring, indicating that the contour dimension of the trailer hitch is smaller than the qualified value.

[0006] Further, a tapered hole edge is provided at the port of the bushing seat, and the tail of the trailer hitch has a tapered step that fits with the tapered hole edge. Under the action of the pressing component, the tapered step of the trailer hitch firmly abuts against the tapered hole edge.

[0007] Further, the pressing component includes an adjustment frame, a lifting block, a pulling rope, and a pressing column fixed on the bottom plate. The lifting block is embedded in the adjustment frame. An arc-shaped guide chute is provided on the adjustment frame. A guide shaft is fixed on the lifting block and inserted into the guide chute and slides along the guide chute. The upper end of the pulling rope is tied to the upper end of the adjustment frame. A through hole for the pulling rope to pass through is provided on the lifting block. The lower end of the pulling rope is tied with a support sleeve. A third spring is sleeved on the pulling rope. The upper end of the third spring abuts against the bottom of the lifting block, and the lower end of the third spring abuts against the support sleeve. The pressing column is fixed on the upper end of the lifting block. Under the action of the third spring, the pressing column has a tendency to press the trailer hitch towards the bushing seat.

[0008] First, manually press down the pressing column so that the trailer hitch can be completely inserted into the bushing seat and remain in a horizontal state. After letting go, due to the action of the third spring, the lifting block is pushed to move upward along the arc-shaped guide chute, and the obliquely upward moving pressing column firmly presses the trailer hitch on the bushing seat.

[0009] Further, the clamping component includes a lower support column, a clamp, a column fixed on the bottom plate, a rotating arm, and a locking bolt. One end of the rotating arm is rotatably connected to the upper end of the column. A threaded hole threadedly connected to the locking bolt is provided at the front end of the rotating arm. The clamp is rotatably connected to the upper end of the column and can press the rotating arm. The locking bolt and the lower support column respectively clamp one side of the trailer hitch from above and below.

[0010] Further, a plurality of mounting grooves distributed in a matrix are provided on the bottom plate, and the lower support column is inserted into one of the mounting grooves.

[0011] Select an installation groove at a suitable position, insert the lower support column into the installation groove, and make the upper end of the lower support column abut against the lower end surface on one side of the rotating arm. Then, toggle the rotating arm so that the front end of the rotating arm is located above the trailer hitch. Rotate the locking bolt to make it move downward and abut against the upper end surface on one side of the trailer hitch. In this way, the trailer hitch will not rotate randomly, avoiding the influence on the detection result due to rotation during detection.

[0012] Further, the front end of the rotating arm is T-shaped. Threaded holes are provided on both sides of the front end of the rotating arm, and the side for clamping can be selected according to requirements.

[0013] Further, a first magnet block is fixed to the lower end surface of the rotating plate, and a second magnet block is fixed to the upper end of the swing block. After the rotating plate rotates to the horizontal position, the first magnet block and the second magnet block are adsorbed to each other. After the first magnet block and the second magnet block are adsorbed, the rotating plate is positioned to avoid deviation of the detection result caused by the rotation of the rotating plate during detection. After the detection is completed, rotate the rotating plate upward to facilitate the removal of the trailer hitch from the detection hole.

[0014] Further, handle grips are connected to both ends of the bottom plate. By holding the handle grips at both ends of the bottom plate with both hands respectively, the entire detection device can be easily transferred.

[0015] Compared with the prior art, the automatic detection device for the trailer hitch has the following advantages:

[0016] 1. After the trailer hitch is installed and positioned, start the cylinder for automatic detection. The detection rod translates along the outer contour of the trailer hitch. During the translation process, since the force that the second spring pushes the detection rod upward is constant, and the detection rod always remains perpendicular during translation, it avoids the deviation of the detection result caused by the manual operation of the worker on the detection rod, improving the detection accuracy.

[0017] 2. The positioning fixture uses three positioning points to accurately limit the trailer hitch, and it is not easy to displace during detection. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the automatic detection device for the trailer hitch.

[0019] Figure 2 is a schematic structural diagram of the positioning fixture.

[0020] Figure 3 is a schematic structural diagram of the pressing component.

[0021] Figure 4 is a sectional view of the pressing component.

[0022] Figure 5 is a three-dimensional structural diagram of the detection mechanism.

[0023] Figure 6 is a top view structural diagram of the detection mechanism.

[0024] Figure 7 It is a schematic cross-sectional structure diagram of a detection mechanism.

[0025] Figure 8 It is a schematic structure diagram of a trailer hitch product.

[0026] In the figure, 1 is the bottom plate; 12 is the installation groove; 13 is the handle; 2 is the bushing seat; 21 is the tapered hole edge; 3 is the pressing assembly; 31 is the adjustment frame; 32 is the lifting block; 33 is the pulling rope; 34 is the pressing column; 35 is the guiding chute; 36 is the guiding shaft; 37 is the support sleeve; 38 is the third spring; 4 is the clamping assembly; 41 is the lower support column; 42 is the clamping pliers; 43 is the column; 44 is the rotating arm; 45 is the locking bolt; 5 is the detection mechanism; 51 is the mounting block; 52 is the vertical plate; 53 is the profile plate; 54 is the detection hole; 55 is the rotating shaft; 56 is the rotating plate; 57 is the cylinder; 58 is the pulling seat; 59 is the square straight rod; 510 is the square frame; 511 is the slide rail; 512 is the slide block; 513 is the first spring; 514 is the detection rod; 515 is the limiting block; 516 is the second spring; 517 is the passing round rod part; 518 is the stopping round rod part; 519 is the first magnet block; 520 is the second magnet block; 521 is the swing block; 6 is the trailer hitch; 61 is the tapered step. Detailed implementation manners

[0027] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0028] As Figure 1 、 Figure 2 shown, the automatic detection device of the present trailer hitch includes a bottom plate 1, a positioning fixture and a detection mechanism 5. The positioning fixture includes a bushing seat 2 fixed on the bottom plate 1 for the tail of the trailer hitch 6 to be inserted, a pressing assembly 3 for pressing the trailer hitch 6 towards the bushing seat 2, and a clamping assembly 4 for horizontally clamping the front end of the trailer hitch 6. The two ends of the bottom plate 1 are connected with handles 13. By holding the handles 13 at both ends of the bottom plate 1 with both hands respectively, the entire detection device can be easily transferred.

[0029] As Figure 8 shown, the port of the bushing seat 2 is provided with a tapered hole edge 21, and the tail of the trailer hitch 6 has a tapered step 61 that fits with the tapered hole edge 21. Under the action of the pressing assembly 3, the tapered step 61 of the trailer hitch 6 firmly abuts against the tapered hole edge 21.

[0030] As Figure 5 、 Figure 6 、 Figure 7As shown in the figure, the detection mechanism 5 includes a mounting block 51 fixed on the bottom plate 1, a vertical plate 52, a swing block 521 swing-connected to the mounting block 51, a contour plate 53 fixed on the swing block 521. A detection hole 54 for the trailer hitch 6 to be inserted is formed on the contour plate 53, and there is a gap between the outer contour of the trailer hitch 6 and the detection hole 54. A rotating plate 56 is rotatably connected to the vertical plate 52 through a rotating shaft 55. A cylinder 57 is fixed on the rotating plate 56. There is a pulling seat 58 on the rotating plate 56. A square straight rod 59 is inserted through the pulling seat 58 and slides back and forth along the pulling seat 58. The cylinder 57 is connected to the tail of the square straight rod 59 and drives the square straight rod 59 to move back and forth. On both sides of the front end of the square straight rod 59, there are square frames 510 vertically connected to the square straight rod 59. A slide rail 511 is fixed inside the square frames 510. A slide seat 512 and a first spring 513 are sleeved on the slide rail 511. Under the action of the first spring 513, the slide seat 512 moves closer to the square straight rod 59. A detection rod 514 that can move up and down is vertically inserted through the slide seat 512. A limit block 515 is provided at the upper end of the detection rod 514. A second spring 516 is sleeved on the detection rod 514. The upper end of the second spring 516 abuts against the limit block 515, and the lower end of the second spring 516 abuts against the slide seat 512. A passing round rod portion 517 is provided at the lower end of the detection rod 514, and a stopping round rod portion 518 is connected to the lower end of the passing round rod portion 517.

[0031] The front end of the detection hole 54 is open. The contour of the detection hole 54 is larger than the outer contour of the trailer hitch 6 with qualified dimensions. Therefore, the gap between the outer contour of the qualified trailer hitch 6 and the detection hole 54 is equidistant. The diameter of the stopping round rod portion 518 is larger than that of the passing round rod portion 517. The pressing assembly 3 presses the trailer hitch 6 in the bushing seat 2 to prevent the trailer hitch 6 from having a horizontal displacement. The clamping assembly 4 clamps one side of the front end of the trailer hitch 6 to prevent the trailer hitch 6 from rotating around the axis direction. The cylinder 57 pulls the detection rod 514 to move along the gap between the trailer hitch 6 and the detection hole 54. The first spring 513 makes the passing round rod portion 517 at the lower end of the detection rod 514 abut against the outer contour of the trailer hitch 6. When the gap is too small, the passing round rod portion 517 will be stuck and unable to move forward, indicating that the contour size of the trailer hitch 6 is larger than the qualified value. And the second spring 516 makes the upper ends of the stopping round rod portion 518 respectively abut against the edges of the trailer hitch 6 and the detection hole 54. When the gap is too large, the stopping round rod portion 518 can pass through the gap, causing the entire detection rod 514 to be pushed up by the second spring 516, indicating that the contour size of the trailer hitch 6 is smaller than the qualified value.

[0032] The lower end surface of the rotating plate 56 is fixed with a magnet block 1 519, and the upper end of the swing block 521 is fixed with a magnet block 2 520. After the rotating plate 56 is rotated to a horizontal position, the magnet block 1 519 and the magnet block 2 520 are attracted. After the magnet block 1 519 and the magnet block 2 520 are attracted, the rotating plate 56 is positioned to avoid the rotating plate 56 rotating during the detection, which may cause deviation in the detection result. After the detection is completed, the rotating plate 56 is rotated upward to facilitate the removal of the trailer hook 6 from the detection hole 54.

[0033] like Figure 3 , Figure 4 As shown, the clamping assembly 3 includes an adjustment frame 31 fixed on the base plate 1, a lifting block 32, a pull rope 33 and a clamping column 34, the lifting block 32 is embedded in the adjustment frame 31, the adjustment frame 31 is provided with an arc-shaped guide groove 35, the lifting block 32 is fixed with a guide shaft 36 inserted into the guide groove 35 and sliding along the guide groove 35, the upper end of the pull rope 33 is tied to the upper end of the adjustment frame 31, the lifting block 32 is provided with a through hole for the pull rope 33 to pass through, the lower end of the pull rope 33 is tied with a support sleeve 37, the pull rope 33 is sleeved with a third spring 38, the upper end of the third spring 38 is against the bottom of the lifting block 32, the lower end of the third spring 38 is against the support sleeve 37, the clamping column 34 is fixed to the upper end of the lifting block 32, and under the action of the third spring 38, the clamping column 34 has a tendency to press the trailer hook 6 toward the shaft sleeve seat 2.

[0034] First, manually press down the clamping column 34 so that the trailer hook 6 can be fully inserted into the shaft sleeve seat 2 and remain in a horizontal state. After releasing the hand, the lifting block 32 is pushed upward along the arc-shaped guide groove 35 due to the force of the third spring 38, and the inclined upward clamping column 34 presses the trailer hook 6 firmly on the shaft sleeve seat 2.

[0035] like Figure 2 , Figure 3 As shown, the clamping assembly 4 includes a lower support column 41, a pressure clamp 42, a column 43 fixed on the base plate 1, a rotating arm 44 and a locking bolt 45. One end of the rotating arm 44 is rotatably connected to the upper end of the column 43. A threaded hole threadedly connected to the locking bolt 45 is opened at the front end of the rotating arm 44. The pressure clamp 42 is rotatably connected to the upper end of the column 43 and can clamp the rotating arm 44. The locking bolt 45 and the lower support column 41 clamp one side of the trailer hook 6 from the top and bottom respectively.

[0036] The bottom plate 1 is provided with a plurality of mounting grooves 12 distributed in a matrix, and the lower support column 41 is inserted into one of the mounting grooves 12. Select the mounting groove 12 at a suitable position, insert the lower support column 41 into the mounting groove 12, and the upper end of the lower support column 41 abuts against the lower end surface of one side of the rotating arm 44. Move the rotating arm 44 so that the front end of the rotating arm 44 is located above the trailer hook 6, and rotate the locking bolt 45 so that the locking bolt 45 moves downward and abuts against the upper end surface of one side of the trailer hook 6. In this way, the trailer hook 6 will not rotate at will, and the rotation during detection will not affect the detection result.

[0037] The front end of the rotating arm 44 is T-shaped. Threaded holes are provided on both sides of the front end of the rotating arm 44, and the side for clamping can be selected according to requirements.

[0038] Detection process: In the first step, first install the trailer hitch 6 onto the positioning fixture, lift the rotating arm 44, the rotating plate 56, and the swing block 521 upward, press down the pressing column 34 to facilitate the horizontal insertion of the tail of the trailer hitch 6 into the bushing seat 2, and release the pressing column 34. At this time, the third spring 38 pushes the lifting block 32 to move upward along the guide chute 35, and the pressing column 34 presses the trailer hitch 6 towards the bushing seat 2. At this time, one side of the trailer hitch 6 abuts against the lower support column 41. Rotate the rotating arm 44 so that the lower end of the locking bolt 45 presses on the trailer hitch 6, use the crimping pliers 42 to press the rotating arm 44, then put down the swing block 521 and the rotating plate 56 in sequence. The rotating plate 56 adheres tightly to the swing block 521 by being adsorbed on the magnet block two 520 by the magnet block one 519. Push the detection rods 514 on both sides into the detection holes 54 so that the stop round rod portion 518 is located below the trailer hitch 6. Start the cylinder 57 to drive the passing round rod portion 517 to move along the gap until the two detection rods 514 converge, completing the detection of the contour of the trailer hitch 6. If the passing round rod portion 517 gets stuck in the gap, it indicates that the outer contour size of the trailer hitch 6 is too large, resulting in a smaller gap. If the stop round rod portion 518 is pulled upward by the second spring 516 and passes through the gap or gets stuck in the gap, it indicates that the outer contour size of the trailer hitch 6 is too small, resulting in a larger gap. The above two detection results both indicate that the outer contour size of the trailer hitch 6 is unqualified.

[0039] The specific embodiments described in this text are merely illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An automatic detection device for a trailer hitch, comprising a bottom plate (1), a positioning fixture, and a detection mechanism (5), characterized in that, The positioning fixture includes a bushing seat (2) fixed on the bottom plate (1) for the tail of the trailer hitch (6) to be inserted, a pressing assembly (3) for pressing the trailer hitch (6) towards the bushing seat (2), and a clamping assembly (4) for horizontally clamping the front end of the trailer hitch (6). The detection mechanism (5) includes a mounting block (51), a vertical plate (52) fixed on the bottom plate (1), and a swing block (521) swingably connected to the mounting block (51). A contour plate (53) is fixed on the swing block (521). A detection hole (54) for the trailer hitch (6) to be inserted is formed on the contour plate (53), and there is a gap between the outer contour of the trailer hitch (6) and the detection hole (54). A rotating plate (56) is rotatably connected to the vertical plate (52) through a rotating shaft (55). A cylinder (57) is fixed on the rotating plate (56). A pulling seat (58) is provided on the rotating plate (56). A square straight rod (59) is inserted through the pulling seat (58). The cylinder (57) is connected to the tail of the square straight rod (59) and drives the square straight rod (59) to move back and forth. On both sides of the front end of the square straight rod (59), there are square frames (510) vertically connected to the square straight rod (59). A slide rail (511) is fixed inside the square frame (510). A slide seat (512) and a first spring (513) are sleeved on the slide rail (511). Under the action of the first spring (513), the slide seat (512) moves closer to the square straight rod (59). A detection rod (514) that can move up and down is vertically inserted through the slide seat (512). A limiting block (515) is provided at the upper end of the detection rod (514). A second spring (516) is sleeved on the detection rod (514). The upper end of the second spring (516) abuts against the limiting block (515), and the lower end of the second spring (516) abuts against the slide seat (512). A passing round rod portion (517) is provided at the lower end of the detection rod (514), and a stopping round rod portion (518) is connected to the lower end of the passing round rod portion (517).

2. The automatic detection device for a trailer hitch according to claim 1, characterized in that, A conical hole edge (21) is formed at the port of the bushing seat (2), and a conical step (61) that fits with the conical hole edge (21) is provided at the tail of the trailer hitch (6).

3. The automatic detection device for a trailer hitch according to claim 1, characterized in that, The pressing assembly (3) includes an adjustment frame (31), a lifting block (32), a pulling rope (33), and a pressing column (34) fixed on the bottom plate (1). The lifting block (32) is embedded in the adjustment frame (31). An arc-shaped guide chute (35) is formed on the adjustment frame (31). A guide shaft (36) that is fixed on the lifting block (32) and inserted into the guide chute (35) and slides along the guide chute (35) is provided. The upper end of the pulling rope (33) is tied to the upper end of the adjustment frame (31). A through hole for the pulling rope (33) to pass through is formed on the lifting block (32). A support sleeve (37) is tied to the lower end of the pulling rope (33). A third spring (38) is sleeved on the pulling rope (33). The upper end of the third spring (38) abuts against the bottom of the lifting block (32), and the lower end of the third spring (38) abuts against the support sleeve (37). The pressing column (34) is fixed on the upper end of the lifting block (32). Under the action of the third spring (38), the pressing column (34) has a tendency to press the trailer hitch (6) towards the bushing seat (2).

4. An automatic detection device for a trailer hitch according to claim 1 or 2 or 3, characterized in that, The clamping assembly (4) includes a lower support column (41), a clamping pliers (42), a column (43) fixed on the bottom plate (1), a rotating arm (44) and a locking bolt (45). One end of the rotating arm (44) is rotatably connected to the upper end of the column (43). A threaded hole threadedly connected to the locking bolt (45) is formed at the front end of the rotating arm (44). The clamping pliers (42) are rotatably connected to the upper end of the column (43) and can press the rotating arm (44). The locking bolt (45) and the lower support column (41) respectively clamp one side of the trailer hitch (6) from above and below.

5. The automatic detection device for a trailer hitch according to claim 4, characterized in that, A plurality of mounting grooves (12) distributed in a matrix are formed on the bottom plate (1), and the lower support column (41) is inserted into one of the mounting grooves (12).

6. The automatic detection device for a trailer hitch according to claim 5, characterized in that, The front end of the rotating arm (44) is T-shaped.

7. The automatic detection device for a trailer hitch according to claim 6, characterized in that, A first magnet block (519) is fixed to the lower end surface of the rotating plate (56), and a second magnet block (520) is fixed to the upper end of the swing block (521). After the rotating plate (56) rotates to the horizontal position, the first magnet block (519) is adsorbed to the second magnet block (520).

8. The automatic detection device for a trailer hitch according to claim 7, characterized in that, Handle holders (13) are connected to both ends of the bottom plate (1).

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