A sleeve welding mistake proofing mechanism

Abstract

The present application relates to the field of welding tooling, and discloses a sleeve welding mistake-proofing mechanism, which comprises a rotary arm, a proximity switch connected to the top end of the rotary arm, an extension frame connected to the bottom end of the rotary arm, a vertical pilot pin connected to the extension frame, a vertical limiting assembly located above the pilot pin, a vertical sensing assembly sleeved outside the pilot pin, the vertical limiting assembly providing elastic pressure downward to the vertical sensing assembly, and a sensing lever provided on the extension frame, one end of the sensing lever being hinged to the vertical sensing assembly and the other end being located outside the sensing surface of the proximity switch, and the swing of the sensing lever being sensed by the proximity switch.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding tooling, in particular to a sleeve welding mistake-proofing mechanism. BACKGROUND

[0002] Some sheet workpieces in automobile parts need to be welded with sleeves, and the sleeves are used for positioning or connecting other automobile parts. In order to ensure that the workpiece can be effectively assembled in the subsequent assembly process, the number of welded sleeves must meet the requirements and cannot appear the situation of missing welding. In order to ensure the precision of the workpiece in the subsequent assembly process, the length, inner diameter and welding positioning precision of the sleeve need to be controlled within a certain allowable range. In the prior art, the production line of automobile parts is mainly carried out by automatic welding robots. Workers place the sleeves on the workpiece according to the required position and position them through tooling, and then the welding robot automatically welds the sleeves. In the current operation process, the sleeves are pre-processed and provided in batches. The length and inner diameter of the sleeve have certain deviations. In the process of positioning the sleeve on the workpiece, the worker directly randomly grabs the sleeve and places it on the workpiece and then uses the tooling to press and position. The detection process of the sleeve is lacking, so that some sleeves with length and inner diameter greater than or less than the allowable range are also directly welded on the workpiece, which leads to the problem that the workpiece cannot be effectively assembled subsequently. SUMMARY

[0003] The present application aims to provide a sleeve welding mistake-proofing mechanism to solve the problem that in the prior art, the length of the sleeve is not detected when the sleeve is welded on the workpiece, resulting in that some sleeves that do not meet the requirements are welded on the workpiece, which makes the workpiece cannot be used subsequently.

[0004] To achieve the above purpose, the present application adopts the following technical scheme: a sleeve welding mistake-proofing mechanism, comprising a rotating arm, a proximity switch connected to the top end of the rotating arm, an extension frame connected to the bottom end of the rotating arm, a vertical guide pin connected to the extension frame, a vertical limiting component located above the vertical guide pin, a vertical sensing component sleeved outside the vertical guide pin, the vertical limiting component providing elastic pressure downward to the vertical sensing component, a sensing lever provided on the extension frame, one end of the sensing lever being hinged to the vertical sensing component and the other end being located outside the sensing surface of the proximity switch, and the swing of the sensing lever being sensed by the proximity switch.

[0005] The principle and advantages of the present scheme are: in actual application, after the sleeve is placed on the workpiece, the rotating arm rotates to drive the extension frame to move the pilot pin and the vertical limiting assembly above the sleeve, through the action of the rotating arm, the pilot pin presses and positions the sleeve from top to bottom, the vertical sensing assembly is in contact with the top end of the sleeve under the pressure of the vertical limiting assembly, so that the length of the sleeve is fed back to one end of the sensing lever through the vertical sensing assembly, and then the other end of the sensing lever swings outside the sensing surface of the proximity switch, the proximity switch senses the swing amplitude of the sensing lever, when the swing amplitude exceeds the anti-missing detection sensing range of the proximity switch, the welding equipment cannot be started, thereby realizing the mistake-proofing and anti-missing of sleeve welding, and ensuring that the length of the welded sleeve meets the requirements.

[0006] Further, the vertical sensing assembly includes a frame with one side open, the frame bottom is provided with a positioning hole for the pilot pin to pass through, the frame top is fixed with a vertical connecting rod, the connecting rod top end is inserted with a connecting block, and the connecting block is hinged with one end of the sensing lever. Preferably, as an improvement, the frame provides active protection for the pilot pin and ensures that the vertical sensing assembly does not interfere with the pilot pin, and the connecting rod top end is connected with the sensing lever through the inserted connecting block, which facilitates assembly operation.

[0007] Further, the vertical limiting assembly includes a vertical limiting protective sleeve, the limiting protective sleeve is straight cylindrical, the limiting protective sleeve is sleeved on the connecting rod from top to bottom, and the limiting protective sleeve is provided with an elastic member for elastically pressing the vertical sensing assembly downward. Preferably, as an improvement, the limiting protective sleeve limits and protects the connecting rod, and the elastic member presses the vertical sensing assembly downward, so that the vertical sensing assembly can effectively abut against the sleeve, and then accurately and reliably feed back the length of the sleeve to the sensing lever, ensuring reliable detection of the length of the sleeve.

[0008] Further, the limiting ring is formed by extending the limiting protective sleeve top end inward, the connecting rod top end passes through the limiting ring and is inserted with the connecting block, and the elastic member is a spring sleeved on the connecting rod below the limiting ring. Preferably, as an improvement, the limiting ring limits the upper end of the spring, so that the spring can apply a stable and reliable downward pressing force to the vertical sensing assembly, the spring sleeved on the connecting rod can ensure effective pressing of the vertical sensing assembly and avoid mutual interference with the connecting rod to affect the action stability, and the structure is more compact, the stable isolation protection is provided by the limiting protective sleeve, which will not be affected by external factors, and can work stably and reliably for a long time.

[0009] Further, the extension frame on the side close to the rotating arm of the limiting protective sleeve is provided with a vertical support rod, the top end of the support rod is hinged to the sensing lever as a fulcrum, the end close to the proximity switch of the sensing lever is fixed with a sensing contact, the side of the sensing lever hinged to the connecting block is provided with an oblong hole, and the connecting block is hinged to the sensing lever through a pin shaft inserted in the oblong hole. Preferably, as an improvement, the limiting protective sleeve, the support rod and the proximity switch at the top of the rotating arm are made as a whole through the extension frame, the position of the fulcrum of the sensing lever is fixed relative to the proximity switch and the limiting protective sleeve, which is conducive to ensuring the accuracy and reliability of the feedback of the sleeve length by the sensing lever. The sensing contact can ensure the accuracy of the sensing feedback of the proximity switch, and the vertical displacement change of the connecting block can be effectively fed back as the swing of the sensing lever through the oblong hole and the pin shaft, thereby ensuring the sensing detection accuracy.

[0010] Further, the extension frame includes a transverse positioning slide block, the end of the positioning slide block extends into the frame body, the position of the positioning slide block in the frame body is provided with a vertical mounting hole, a pilot pin is vertically inserted into the mounting hole, and the side end of the positioning slide block is provided with a locking hole communicated to the mounting hole, and a locking screw is connected in the locking hole. Preferably, as an improvement, the positional relationship between the positioning slide block and the frame body ensures that the operation of the vertical sensing assembly is not affected by the pilot pin, and the pilot pin can be locked on the positioning slide block through the locking screw, ensuring that the pilot pin can work stably and reliably.

[0011] Further, the bottom end of the pilot pin is in the shape of a circular truncated cone. Preferably, as an improvement, when the length of the sleeve meets the standard but the inner diameter size is too large or too small, the depth of the pilot pin inserted into the sleeve changes, the overall height of the extension frame, the sensing lever, the proximity switch and the limiting protective sleeve changes accordingly, and the sleeve length pressed and fed back by the vertical sensing assembly remains unchanged, and the swing of the relative sensing lever will feed back that the inner diameter of the sleeve does not meet the requirements, thereby being able to accurately and automatically detect whether the inner diameter of the sleeve meets the use requirements.

[0012] Further, the rotating shaft of the rotating arm is rotationally connected to the base, the rotating shaft is fixedly connected with a swing arm, the base is connected with a pneumatic cylinder at the bottom end, and the swing arm is provided with a long hole, and the extension end of the pneumatic cylinder is hinged in the long hole. Preferably, as an improvement, the rotating shaft of the rotating arm forms a lever structure through the swing arm, and the long hole enables the swing of the rotating arm to be effectively driven through the extension and retraction action of the pneumatic cylinder, which is more conducive to optimizing the overall structure and reducing the space occupation.

[0013] Further, the base below the rotating arm is connected with a connecting seat, the connecting seat is in the shape of L, the short side and the long side of the connecting seat are both provided with connecting holes, and the long side of the connecting seat abuts against the base. Preferably, as an improvement, the connecting seat and the connecting holes facilitate the overall installation and positioning, and facilitate flexible assembly on the welding tool for use.

[0014] Further, the long side of the connecting seat is connected with a supporting block, the upper end of the supporting block is connected with an upward convex letter-shaped lower supporting block, and the extending frame is connected with an opening downward concave letter-shaped upper supporting block. Preferably, as an improvement, the lower supporting block and the upper supporting block can be inserted and connected to guide the swinging of the extending frame, and can also provide certain support in the process of pressing down the extending frame, thereby ensuring the stability of the extending frame. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the embodiment of the present application.

[0016] Figure 2 It is a side view of the embodiment of the present application.

[0017] Figure 3 It is a partial sectional view of the position of the limiting protective sleeve in the embodiment of the present application. DETAILED DESCRIPTION

[0018] The following will be further described in detail through specific embodiments:

[0019] The reference signs in the drawings of the specification include: cylinder 1, base 2, upper supporting block 3, rotating arm 4, proximity switch 5, sensing contact 6, sensing lever 7, supporting rod 8, connecting block 9, connecting rod 10, limiting protective sleeve 11, positioning sliding block 12, frame body 13, guiding pin 14, extending frame 15, lower supporting block 16, connecting seat 17, spring 18.

[0020] The embodiment is basically as shown in the accompanying drawings Figure 1 , Figure 2As shown: a sleeve welding mistake prevention mechanism, including base 2, the base 2 is transversely provided with a rotating shaft, the rotating shaft and the base 2 are connected through a bearing, the middle part of the rotating shaft is welded with a swing arm, the bottom end of the base 2 is bolted with a cylinder 1, the swing arm is provided with a long hole, the telescopic end of the cylinder 1 is hinged in the long hole. The outer side of the base 2 is provided with a rotating arm 4, the rotating arm 4 is bolted on the rotating shaft, the end of the rotating arm 4 is bolted with a positioning cylinder, the side wall of the positioning cylinder is provided with a threaded hole connected with a positioning bolt, the positioning cylinder is provided with a proximity switch 5, the proximity switch 5 is fixed in the positioning cylinder through the positioning bolt. The sensing signal of the proximity switch 5 is one of the starting signals of the welding robot. The end of the rotating arm 4 is bolted with an extension frame 15, the extension frame 15 includes a transverse positioning slider 12, the positioning slider 12 is provided with a vertical mounting hole, a pilot pin 14 is vertically inserted into the mounting hole from bottom to top, the bottom end of the pilot pin 14 is in the shape of a circular truncated cone. The side end of the positioning slider 12 is provided with a locking hole connected to the mounting hole, the locking hole is connected with a locking screw. The upper end of the positioning slider 12 is bolted with an adapter block, the adapter block is welded with a limiting protective sleeve 11 above the pilot pin 14, the limiting protective sleeve 11 is a straight cylinder. The outer side of the pilot pin 14 is provided with a frame 13 with one side open, the end of the positioning slider 12 extends into the frame 13, the bottom of the frame 13 is provided with a positioning hole for the pilot pin 14 to pass through, the top of the frame 13 is welded with a vertical connecting rod 10, the top end of the connecting rod 10 is provided with a slot, the slot is inserted with a connecting block 9. The side of the adapter block away from the limiting protective sleeve 11 is bolted with a support rod 8, the top end of the support rod 8 is hinged with a sensing lever 7 as a fulcrum, one end of the sensing lever 7 is hinged with the connecting block 9, the other end is close to the proximity switch 5. The sensing lever 7 is provided with a long circular hole on the side hinged with the connecting block 9, the connecting block 9 is hinged with the sensing lever 7 through the pin shaft inserted in the long circular hole. The end of the sensing lever 7 on the side of the proximity switch 5 is welded with a sensing contact 6, the sensing contact 6 is outside the sensing surface of the proximity switch 5, the swing of the sensing lever 7 is sensed by the proximity switch 5.

[0021] In combination Figure 3 As shown, the limiting protective sleeve 11 is sleeved on the connecting rod 10 from top to bottom, the limiting protective sleeve 11 is provided with an elastic element inside for elastically pressing the vertical sensing assembly downward. The top end of the limiting protective sleeve 11 extends inward to form a limiting ring, the top end of the connecting rod 10 passes through the limiting ring and is inserted with the connecting block 9, the elastic element is a spring 18 sleeved on the connecting rod 10 below the limiting ring, the limiting protective sleeve 11 provides the downward elastic pressure on the connecting rod 10 through the spring 18.

[0022] The base 2 below the rotating arm 4 is connected with a connecting seat 17, the connecting seat 17 is L-shaped, the connecting seat 17 is provided with connecting holes on the short side and the long side, and the long side of the connecting seat 17 is close to the base 2. The long side of the connecting seat 17 is connected with a support block, the upper end of the support block is connected with an upwardly convex lower supporting block 16, the extension frame 15 is connected with an upwardly concave upper supporting block 3.

[0023] The specific implementation process is as follows: in the normal state, the sleeve that meets the requirements is welded to the workpiece, the sleeve is placed on the workpiece, the cylinder 1 drives the rotating arm 4 to swing, so that the extension frame 15, the positioning slider 12, the guide pin 14, the limiting protection sleeve 11 and the supporting rod 8 move downward synchronously, the guide pin 14 is inserted into the sleeve from above, and the middle part of the lower circular table of the guide pin 14 abuts against the top end of the sleeve under the condition that the length and the inner diameter of the sleeve meet the requirements, and the upper supporting block 3 and the lower supporting block 16 are only partially inserted. After the guide pin 14 is inserted into the top end of the sleeve and remains stable, the proximity switch 5 is fixed in position, the limiting protection sleeve 11 is fixed in position, the connecting rod 10 is pressed downward by the spring 18 in the limiting protection sleeve 11, so that the bottom end of the frame body 13 abuts against the top end of the sleeve, the sleeve lifts up the frame body 13 and the connecting rod 10, the connecting block 9 at the top of the connecting rod 10 lifts up the inductive lever 7 upward, and the inductive contact 6 at the other end of the inductive lever 7 remains in the inductive range of the proximity switch 5. The proximity switch 5 feeds back the anti-leakage detection signal of the inductive contact 6 to the welding robot, and the welding robot can start the welding operation of the sleeve.

[0024] If the inner diameter of the sleeve meets the requirements, the length does not meet the requirements, the length of the sleeve exceeds the required length, the distance that the frame body 13 and the connecting rod 10 are lifted upward exceeds the normal state, the length of the sleeve is less than the required length, and the distance that the frame body 13 and the connecting rod 10 are lifted upward is less than the normal state, the swing amplitude of the inductive lever 7 exceeds the normal state, the inductive contact 6 is out of the inductive range of the proximity switch 5, the proximity switch 5 has no induction, and the welding robot cannot be started, thereby completing the detection of the sleeve with a length that does not meet the requirements.

[0025] If the length of the sleeve meets the requirements, the inner diameter does not meet the requirements, the inner diameter of the sleeve exceeds the required inner diameter, the depth that the guide pin 14 is inserted into the sleeve exceeds the normal state, and the height of the limiting protection sleeve 11 is lower than the normal state; the inner diameter of the sleeve is less than the required inner diameter, the depth that the guide pin 14 is inserted into the sleeve is less than the normal state, and the height of the limiting protection sleeve 11 is higher than the normal state; but the height that the frame body 13 and the connecting rod 10 are lifted upward is the same as the normal state, the swing amplitude of the inductive lever 7 exceeds the normal state, the inductive contact 6 is out of the inductive range of the proximity switch 5, the proximity switch 5 has no induction, and the welding robot cannot be started, thereby completing the detection of the sleeve with an inner diameter that does not meet the requirements.

[0026] The above-mentioned are only embodiments of the present application, and common technical solutions and / or common knowledge of the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A sleeve welding mistake proofing mechanism characterized by: The rotating arm is provided with a proximity switch at the top end and an extension frame at the bottom end, the extension frame is provided with a vertical guide pin and a vertical limiting assembly above the guide pin, a vertical sensing assembly is sleeved outside the guide pin, the vertical limiting assembly provides elastic pressure downward to the vertical sensing assembly, the extension frame is further provided with a sensing lever, one end of the sensing lever is hinged to the vertical sensing assembly and the other end is outside the sensing surface of the proximity switch, and the swing of the sensing lever is sensed by the proximity switch; The vertical sensing assembly comprises a frame with an open side, the bottom of the frame is provided with a positioning hole for the guide pin to pass through, the top of the frame is fixed with a vertical connecting rod, the top end of the connecting rod is inserted with a connecting block, and one end of the connecting block is hinged to the sensing lever; The vertical limiting assembly comprises a vertical limiting protective sleeve, the limiting protective sleeve is a straight cylinder, the limiting protective sleeve is sleeved on the connecting rod from top to bottom, and the limiting protective sleeve is provided with an elastic member for elastically pressing the vertical sensing assembly downward; The top end of the limiting protective sleeve extends inward to form a limiting ring, the top end of the connecting rod passes through the limiting ring and is inserted with the connecting block, and the elastic member is a spring sleeved on the connecting rod below the limiting ring; A vertical support rod is arranged on the extension frame close to the rotating arm, the top end of the support rod is hinged to the sensing lever as a fulcrum, the end of the sensing lever on the side of the proximity switch is fixed with a sensing contact, the sensing lever is hinged to the connecting block and is provided with an oblong hole, and the connecting block is hinged to the sensing lever through a pin shaft arranged in the oblong hole; The extension frame comprises a transverse positioning slide block, the end of the positioning slide block extends into the frame, the part of the positioning slide block in the frame is provided with a vertical mounting hole, the guide pin is vertically inserted into the mounting hole, the side end of the positioning slide block is provided with a locking hole communicated with the mounting hole, and a locking screw is connected in the locking hole; the bottom end of the guide pin is in the shape of a circular truncated cone, the guide pin is inserted into a sleeve from the top, and the bottom end of the frame abuts against the top end of the sleeve.

2. A cannula welding mistake proofing mechanism according to claim 1, characterized in that: The rotating arm is provided with a rotating shaft rotatably connected to the base, the rotating shaft is fixedly connected with a swing arm, the base is connected with a cylinder at the bottom end, the swing arm is provided with a long hole, and the telescopic end of the cylinder is hinged in the long hole.

3. A cannula welding mistake proofing mechanism according to claim 2, wherein: A connecting seat is connected to the base below the rotating arm, the connecting seat is in the shape of L, the short side and the long side of the connecting seat are both provided with connecting holes, and the long side of the connecting seat abuts against the base.

4. A cannula welding mistake proofing mechanism according to claim 3, wherein: A support block is connected to the long side of the connecting seat, the support block is connected with an upwardly protruding letter-shaped lower supporting block at the upper end, and the extension frame is connected with a concave letter-shaped upper supporting block with an opening downward. The rotating arm is provided with a rotating shaft rotatably connected to the base, the rotating shaft is fixedly connected with a swing arm, the base is connected with a cylinder at the bottom end, the swing arm is provided with a long hole, and the telescopic end of the cylinder is hinged in the long hole.

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