Valve stem crack detection structure and feeder with the detection structure

Abstract

The present invention discloses a valve stem crack detection structure and a feeder with the detection structure, comprising a main frame, an immersion device and a lifting and rotating device, wherein a semicircular buckle is arranged on the main frame, and the immersion device comprises an immersion pool, wherein a colored cleaning liquid is arranged in the immersion pool, and wherein a first elastic lifting member and a second elastic lifting member are arranged in the immersion pool. The present invention provides a valve stem crack detection structure and a feeder with the detection structure, which can remove oil and clean the valve stems after turning one by one, color the gaps during the cleaning process, scan and detect the circumference of the valve stem through a visual camera, automatically drop and screen the valve stems with cracks, and clean the intact valve stems, thereby improving the quality of the valve stems.

Description

Technical Field

[0001] The invention relates to the technical field of non-standard feeders, in particular to a valve stem crack detection structure and a feeder with the detection structure. Background Art

[0002] The valve stem is a part used in an internal combustion engine. It slides on the piston in the internal combustion engine to control the air entering the combustion chamber or to discharge the post-combustion gas from the combustion chamber. The valve stem is mainly composed of a conical head and a stem body.

[0003] The valve stem production process is usually completed through blanking, hot stamping forming the head, turning the stem, surface treatment and grinding and shaping. After turning the stem, the valve stems are collected and enter the surface treatment process.

[0004] During the turning process, pits or fine cracks may appear on the rod due to the influence of the material or the turning tool. The pits can still be identified by observation after surface treatment, but the fine cracks will be covered by the surface coating and cannot be identified, resulting in breakage during high-intensity use after installation.

[0005] However, the existing automatic feeder can only realize single automatic feeding, as shown in the Chinese patent with publication number CN115027868A, and cannot realize auxiliary observation of the valve stem with cracks, so it is necessary to improve the existing automatic feeder. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a valve stem crack detection structure and a loading machine with the detection structure.

[0007] During the metal processing process, tiny cracks will appear on the valve stem, and these tiny cracks are generally not visible to the naked eye at the first time, so a device that can quickly reveal tiny cracks is needed.

[0008] To solve the above technical problems, the present invention is solved through the following technical solutions: a door rod crack detection structure, including a main frame, an immersion device, a lifting and rotating device and a detection device. The immersion device includes an immersion pool with colored cleaning liquid inside, and is arranged on the main frame. The lifting and rotating device includes a movable fork plate for carrying the valve stem and a lifting member for driving the movable fork plate up and down in and out of the immersion pool. The main frame is provided with a semicircular buckle for limiting the movable fork plate. The valve stem falls on the movable fork plate, and the lifting member contracts to pull the movable fork plate downward into the immersion pool. The colorant in the colored cleaning liquid invades the gap. The lifting member extends to drive the movable fork plate to leave the immersion pool. When it touches the semicircular buckle, it rotates, and the valve stem slides onto a guide member obliquely arranged on the side of the main frame. The detection device arranged on the guide member performs colored gap identification detection on the slid-in valve stem.

[0009] The beneficial effect is that when the cleaning agent is applied to the surface of the valve stem, the colorant is simultaneously immersed in the existing gaps, and the colorant accumulates in the gaps, so that the gaps can be clearly observed, and then the valve stem is scanned and detected circumferentially by a visual camera to identify the valve stem with cracks.

[0010] In the above scheme, preferably, a first elastic lifting member and a second elastic lifting member are provided in the immersion pool, which are used to elastically support the movable fork plate, a rotating shaft is provided on one end of the movable fork plate, a semicircular groove is provided on the first elastic lifting member, and the rotating shaft is rotatably set in a movable ring formed by the semicircular buckle and the semicircular groove.

[0011] In the above scheme, preferably, the lifting and rotating device of the lifting device also includes a rotating plate, one end of the rotating plate is rotatably connected to the middle position of the movable fork plate, and the other end is rotatably connected to the top end of the telescopic rod of the lifting member.

[0012] In the above scheme, preferably, the colored cleaning liquid includes 1-20% colorant and 10-45% detergent aid by weight, the detergent aid is used to clean the oil stains on the valve stem, and the colorant can penetrate into the cracks on the surface of the valve stem to color it.

[0013] In the above scheme, preferably, the detection device includes a limit frame, a limit piece and a visual camera are arranged on the limit frame, a power roller is arranged on the limit piece, the valve stem touches the limit piece, the power roller can drive the valve stem to rotate, and the visual camera can perform visual inspection on the stem to identify colored cracks.

[0014] In the above scheme, preferably, pits are evenly arranged on the edge of the C-shaped opening at the upper end of the movable fork plate, and when the movable fork plate is tilted, the valve stem vibrates and slides downward, and excess colored cleaning liquid on the valve stem is shaken off.

[0015] In the above scheme, preferably, a notch is provided on one side of the initial section of the guide member, a guide groove is provided on the upper end surface of the guide member, a top contact member is elastically and slidably provided on the guide groove, and a blocking rod is provided on the top contact member to prevent the valve stem head from falling.

[0016] In the above scheme, preferably, a hydraulic cylinder is provided on the limit frame, which is telescopically arranged on the side of the guide member through the hydraulic cylinder guide. When the hydraulic cylinder contracts, the limit frame can extend into the notch of the guide member, and then when the valve stem slides onto the guide member, the head of the valve stem is suspended on the guide member, and the stem of the valve stem is pressed against the limit member.

[0017] In the above scheme, preferably, a winding disk is provided inside the top contact piece, one end of a rope is provided on the winding disk, and the other end is connected to the lower end of the guide groove. When the visual camera detects that there are traces of coloring on the rod part of the valve stem, the winding disk is controlled to start and drive the top contact piece to move toward the lower end of the guide groove, and the suspension fulcrum of the valve stem head disappears and automatically falls downward.

[0018] In the above scheme, preferably, the main frame is the main body of the feeding machine, and the feeding machine is used to ensure that the valve stems that fall on the movable fork plate each time are single, and the valve stems all have the rod body facing the semicircular buckle. The qualified valve stems are screened and sent to the next process along the guide member. At the same time, a spray device is also provided on the guide member to spray clean water on the passing valve stems for cleaning.

[0019] The beneficial effect is that the cracked valve stem is automatically dropped and the intact valve stem is cleaned.

[0020] The beneficial effects of the present invention are as follows: the present invention provides a valve stem crack detection structure and a loader with the detection structure, which can degrease and clean the valve stems that have been turned one by one, color the gaps during the cleaning process, scan and detect the circumference of the valve stems through a visual camera, automatically drop and screen out cracked valve stems, and clean intact valve stems, thereby improving the quality of the finished valve stems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the present invention.

[0022] Figure 2 It is a cross-sectional view of the present invention.

[0023] Figure 3 It is an internal schematic diagram of the present invention.

[0024] Figure 4 It is a schematic diagram of the internal axial side of the present invention.

[0025] Figure 5 It is a partial schematic diagram of the immersion device and the lifting and rotating device of the present invention.

[0026] Figure 6 It is a schematic diagram of the tilted state of the movable fork plate of the present invention.

[0027] Figure 7 Schematic diagram of the movable fork plate in the descending state of the present invention DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Example

[0029] See also Figure 1-Figure 7A valve stem crack detection structure and a feeder having the detection structure include a main frame 1, an immersion device 2, a lifting and rotating device 3 and a detection device 4. The main frame 1 includes a first fixed plate 11, a second fixed plate 12, a collecting plate 13, a lifting plate group 14 and a lifting baffle 17. There is a first gap between the collecting plate 13 and the first fixed plate 11, and a second gap between the first fixed plate 11 and the second fixed plate 12. The lifting plate group 14 includes a first lifting plate 141 and a second lifting plate 142. The first lifting plate 141 is slidably arranged in the first gap, and the second lifting plate 142 is slidably arranged in the second gap. The upper ends of the first fixed plate 11, the second fixed plate 12, the first lifting plate 141 and the second lifting plate 142 are all provided with backward inclined surfaces. A lifting cylinder is arranged below the lifting plate group 14, and the first lifting plate 141 and the second lifting plate 142 move up and down synchronously.

[0030] The valve stem after turning falls on the collecting plate 13, and in the initial state, the lifting plate group 14 is in the lowest state, at this time, the first lifting plate 141 is lower than the lower end position of the collecting plate 13, and then the valve stem automatically falls on the first lifting plate 141, and at this time, the first lifting plate 141 moves upward, which drives the valve stem to move upward together. When the first lifting plate moves to the highest position, the upper end of the first lifting plate 141 is higher than the upper end of the first fixed plate 11, and then the valve on the first lifting plate 141 The valve stem automatically rolls down to the first fixed plate 11. When the lifting plate group 14 drops down to the lowest point, the second lifting plate 142 is lower than the first fixed plate 11, and the valve stem on the first fixed plate 11 automatically rolls down to the second lifting plate 142, and moves upward on the second lifting plate 142, driving the valve stem to move together. When reaching the uppermost end, the upper end of the second lifting plate 142 is higher than the upper end of the second fixed plate 12, and then automatically rolls down to the second fixed plate 12, and the valve stem is pressed against the lifting baffle 17.

[0031] When the lifting plate 17 does not press against the valve stem, the lifting plate assembly 14 is further lifted until the valve stem is on the second fixed plate 12 .

[0032] An inclined plate 111 is arranged on the upper end surface of the first fixed plate 11, and the length of the position where the inclined plate 111 is not arranged is greater than the length of the valve stem and less than the length of a valve stem plus a valve stem head, and the inclined plate 111 is oriented forward, and a sliding plate 112 is elastically guided and slidably arranged on the inclined plate 111, and the distance from the front end surface of the sliding plate 112 to the front end surface of the first fixed plate 11 is less than the radius of the valve stem head, and the rear end of the sliding plate 112 is connected to one end of the first pull rope 113, and the other end is connected to the bottom of the lifting plate group 14.

[0033] After the first lifting plate 141 drives multiple valve stems to rise, the valve stem located at the front end of the inclined plate 111 automatically rolls down to the first lifting plate 141 and falls back onto the collecting plate 13 when the first lifting plate 141 drops below the first fixed plate 11, while the valve stem falls on the surface where the inclined plate 111 is not provided. If the head of the valve stem faces the position of the inclined plate 111 and the head touches the front end surface of the sliding plate 112, then when the first lifting plate 141 is lower than the first fixed plate 11, the position of the valve stem head exceeding the radius is located above the first lifting plate 141, and then under the action of gravity, it also rolls down to the first lifting plate 141 again, follows the first lifting plate 141 and falls back onto the collecting plate 13, and then Only the valve stem with the rod portion of the valve stem facing the inclined plate 111 falls on the first fixed plate 11 when the first lifting plate 141 descends, and when the first lifting plate 141 descends, the second lifting plate 142 descends synchronously. When the second lifting plate 142 descends below the first fixed plate 11, the first pull rope 113 pulls the sliding plate 112 to retract into the inclined plate 111, and then the limit on the rod portion of the valve stem on the first fixed plate 11 disappears, and the valve stem automatically rolls to the second lifting plate 142. When the second lifting plate 142 rises, it rises together and falls onto the second fixed plate 12. Therefore, there is only one valve stem lifted to the second fixed plate 12 each time, and the head of the valve stem is always located on one side of the second fixed plate 12.

[0034] A semicircular buckle 15 is arranged on the main frame 1, and the immersion device 2 includes an immersion pool 21, and a first elastic lifting member 22 and a second elastic lifting member 23 are arranged in the immersion pool 21. Guide rods are arranged on the first elastic lifting member 22 and the second elastic lifting member 23, and are slidably arranged in the immersion pool 21 through the guide rods, and a limiting member is arranged at the lower end of the guide rod, and an elastic member is sleeved on the guide rod, and is elastically limited and lifted upward by the elastic member, and a semicircular groove 221 is arranged at the upper end of the first elastic lifting member 22, and a positioning groove 231 is opened at the upper end of the second elastic lifting member 23. The lifting and rotating device 3 includes a movable fork plate 31, a rotating plate 32 and a lifting member 33, and the lifting member 33 is arranged on the main frame 1, and the telescopic rod of the lifting member 33 extends from the bottom plate of the immersion pool 21 to the inside, and when sliding The movable fork plate 31 is designed as a C-shaped plate with an open end. A rotating shaft 311 is provided on one end of the movable fork plate 31, and a positioning plug plate 312 is provided on the lower end surface of the other end. A blocking plate 313 is elastically guided and slidably provided on the movable fork plate 31. The lower end of the blocking plate 313 is connected to one end of the second pull rope 314, and the other end is connected to the upper end of the second elastic member lifting member 23. Pits are evenly arranged on the edge of the C-shaped opening at the upper end of the movable fork plate 31. When the movable fork plate 31 tilts and the valve stem slides downward, it vibrates and slides, thereby shaking off the excess colored cleaning liquid on the valve stem.

[0035] The colored cleaning liquid is composed of the following components: 35-40% detergent additive, 4-5% surfactant, 4-5% defoaming agent, 5-10% colorant, and 40-50% alcohol.

[0036] In the initial state, the first elastic lifting member 22 and the second elastic lifting member 23 are in a fully elastically extended state, and one end of the movable fork plate 31 is pressed on the semicircular groove 221 through the lower end of the rotating shaft 311, and the upper end of the rotating shaft 311 is pressed on the semicircular buckle 15, the semicircular groove 221 and the semicircular buckle 15 position the rotating shaft 311, and the other end of the movable fork plate 31 is positioned on the positioning groove 231 through the positioning plug plate 312, so that the movable fork plate 31 is locked on the first elastic lifting member 22 and the second elastic lifting member 23, and the lifting member 33 is in the extended middle position at this time.

[0037] After the valve stem is pressed against the lifting baffle 17, when the lifting plate group 14 descends, the lifting baffle 17 rises upward, causing the valve stem to roll backward. In the process of opening the lifting baffle 17, the rod portion of the valve stem first slides downward and touches the blocking plate 313. When the head also rolls onto the movable fork plate 31, the rod portion falls downward into the C-shaped groove of the movable fork plate 31, and the head presses on the groove edge, causing the valve stem to be suspended on the movable fork plate 31 and located on one side of the lifting baffle 17, that is, on one side of the positioning plug plate 312 on the movable fork plate 31. At this time, the lifting member 33 contracts downward, driving the movable fork plate 31 to move downward, thereby immersing the valve stem in the colored cleaning liquid in the immersion pool 21. The cleaning liquid dissolves the oil stains on the valve stem, and the colorant in the cleaning liquid penetrates into the capillary gap and accumulates in the capillary gap.

[0038] After being immersed in liquid for a period of time, the lifting member 33 is lifted upward, and the movable fork plate 31 is restored to its initial state first. The upper end of the rotating shaft 311 is pressed against the semicircular buckle 15. At this time, the lifting member 33 continues to rise upward, and the movable fork plate 31 rotates along the axis of the rotating shaft 311, that is, one end of the valve stem rises upward. During the rising process, the valve stem is blocked by the blocking plate 313 and cannot slide down. When it rises to the set highest point, the second pull rope 314 pulls the blocking plate 313 to be completely immersed in the movable fork plate 31. The valve stem disappears and slides down along the inclined surface. Since pits are evenly arranged on the edge of the C-shaped mouth, the valve stem vibrates and slides during the sliding process, causing the colored cleaning liquid remaining on the valve stem to fall downward into the immersion pool 21, and the colorant in the capillary gap colors the capillary gap. At this time, the cracked valve stem can be found at the first time by observation. Example

[0039] Based on the first embodiment, the second embodiment has further improvements, specifically: Figure 1-Figure 7The side of the main frame 1 is provided with a guide member 16, which is designed as a U-shaped groove, and the upper end surface is in an inclined state, and the inclination angle is consistent with the maximum inclination angle of the movable fork plate 31. When the movable fork plate 31 is inclined to the maximum angle, the C-shaped notch is aligned with the guide member 16, and the valve stem can slide into the U-shaped groove of the guide member 16, and a notch is provided on one side of the initial section of the U-shaped groove of the guide member 16, and a guide groove 161 is provided on the upper end surface of the U-shaped groove of the guide member 16, and a top contact member 162 is elastically guided and slidably provided on the guide groove 161, and a top contact member 162 is provided on the top contact member 162 The blocking rod 1621 and the top contact member 162 are provided with a winding drum, one end of the rope is provided on the winding drum, and the other end is connected to the lower end of the guide groove 161, and the detection device 4 includes a limit frame 41, a hydraulic cylinder is provided on the limit frame 41, and the limit frame 41 is telescopically arranged on the side of the guide member 16 through the hydraulic cylinder guide, a limit member 411 and a visual camera 412 are provided on the limit frame 41, a power roller is provided on the limit member 411, the valve stem touches the limit member 411, the power roller can drive the valve stem to rotate, and the visual camera 412 can perform visual detection on the rod.

[0040] In the initial state, the hydraulic cylinder is contracted and in a contracted state, and the limit frame 41 extends into the notch of the guide member 16. The limit member 411 is located in the middle position of the U-shaped groove and in front of the top contact member 162. At this time, the blocking rod 1621 blocks the notch on one side of the guide member 16, and the movable fork plate 31 causes the valve stem to slide onto the U-shaped groove of the guide member 16 and press on the limit member 411. At the same time, the valve stem head presses on the guide member 16 and the blocking rod 1621, so that the valve stem is in a suspended state. At this time, the detection device 4 starts to start, and the power roller rotates to drive the valve stem to rotate. The visual camera 412 visually identifies the rotating rod to detect whether there are any traces of coloring.

[0041] The valve stem is automatically visually inspected by the visual camera 412, thereby ensuring that every valve stem passing through can be inspected.

[0042] When the visual camera 412 detects that there are traces of color on the valve stem, the winding disk is controlled to start and drive the top contact 162 to move toward the lower end of the guide groove 161. The suspension fulcrum of the valve stem head disappears and the valve stem automatically falls downward. When the visual camera 412 does not detect that there are traces of color on the valve stem, the limit frame 41 is controlled to leave the notch position of the guide member 16, so that the limit frame 41 releases the obstruction of the valve stem, and the valve stem touches the top contact 162. At this time, the winding disk is controlled to start and drive the top contact 162 to move to the lower end of the guide groove 161, and the valve stem moves downward with the top contact 162. A spray device is provided at the position behind the notch of the guide member 16, and the valve stem is sprayed in the process of passing the valve stem to remove oil stains and cleaning fluid on the surface of the valve stem.

[0043] A blanking groove 163 is provided on the lower end of the guide member 16, and the direction of the blanking groove 163 is opposite to the direction of the notch. When the top contact member 162 passes through the blanking groove 163, the supporting point on one side of the valve stem head disappears, and then the valve stem automatically falls downward and flows down from the blanking groove 163 to the surface treatment process. A water trough 164 is provided at the bottom of the guide member 16, and the cleaning water generated by the spraying flows down from the water trough 164.

[0044] After the visual camera 412 performs detection and identification, the cracked valve stems can be screened out and automatically fall down, while the intact valve stems flow into the next process after the automatic cleaning process.

[0045] Its working principle or usage is as follows:

[0046] When the lifting plate 17 is opened, the rod of the valve stem first slides down and touches the blocking plate 313. When the head also rolls down on the movable fork plate 31, the rod falls down into the C-shaped groove of the movable fork plate 31, and the head presses on the groove edge, so that the valve stem is suspended on the movable fork plate 31 and is located on one side of the lifting plate 17. At this time, the lifting member 33 contracts downward, driving the movable fork plate 31 to move downward, so that the valve stem is immersed in the colored cleaning liquid in the immersion pool 21, and the cleaning liquid dissolves the oil on the valve stem. The colorant in the cleaning liquid is immersed in the capillary gap and accumulates in the capillary gap. After a period of immersion, the lifting member 33 is lifted upward, and the movable fork plate 31 first returns to its initial state. At this time, the upper end of the rotating shaft 311 is pressed against the semicircular buckle 15, and the lifting member 33 continues to rise upward, and the movable fork plate 31 rotates along the axis of the rotating shaft 311, and one end of the valve stem rises upward. During the rising process, the valve stem is blocked by the blocking plate 313 and cannot slide down. When it rises to the set highest point, the second pull rope 314 pulls the blocking plate 313 to be completely immersed in the movable fork plate 31, and the valve stem disappears and slides down the inclined surface. Since pits are evenly arranged on the edge of the C-shaped mouth, during the sliding process, it vibrates and slides, causing the colored cleaning liquid remaining on the valve stem to fall downward into the immersion pool 21, and the colorant in the capillary gap develops color for the capillary gap.

[0047] The movable fork plate 31 rotates to make the valve stem slide onto the U-shaped groove of the guide member 16, and the rod is pressed against the limit member 411. At the same time, the head of the valve stem is pressed against the guide member 16 and the blocking rod 1621, so that the valve stem is in a suspended state. At this time, the detection device 4 starts to start, and the power roller rotates to drive the valve stem to rotate. The visual camera 412 visually identifies the rotating rod to detect whether there are any traces of coloring.

[0048] When the visual camera 412 detects that there are traces of coloring on the valve stem, the winding disk is controlled to start driving the top contact 162 to move toward the lower end of the guide groove 161, the suspension fulcrum of the valve stem head disappears, and the valve stem automatically falls downward.

[0049] When the visual camera 412 does not detect any traces of color on the valve stem, the limit frame 41 is controlled to leave the notch position of the guide member 16, so that the limit frame 41 releases the obstruction of the valve stem, and the valve stem touches the top contact member 162. At this time, the winding disk is controlled to start and drive the top contact member 162 to move toward the lower end of the guide groove 161, and the valve stem moves downward with the top contact member 162. A spray device is provided at the position behind the notch of the guide member 16, and the valve stem is sprayed during the passage of the valve stem to remove oil stains and cleaning fluid on the surface of the valve stem.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve stem crack detection structure, characterized in that: The device comprises a main frame (1), an immersion device (2), a lifting and rotating device (3) and a detection device (4); the immersion device (2) comprises an immersion pool (21) in which a colored cleaning liquid is arranged, and is arranged on the main frame (1); The lifting and rotating device (3) comprises a movable fork plate (31) for carrying the valve stem and a lifting member (33) for driving the movable fork plate (31) to move up and down into and out of the immersion pool (21); a semicircular buckle (15) for limiting the movable fork plate (31) is provided on the main frame (1); The valve stem falls onto the movable fork plate (31), the lifting member (33) contracts and pulls the movable fork plate (31) downward into the immersion pool (21), and the colorant in the colored cleaning liquid intrudes into the gap; The lifting member (33) extends to drive the movable fork plate (31) to leave the immersion pool (21), and rotates after contacting the semicircular buckle (15), so that the valve stem slides into a guide member (16) obliquely arranged on the side of the main frame (1), and the detection device (4) arranged on the guide member (16) performs a coloring gap recognition detection on the sliding valve stem; A first elastic lifting member (22) and a second elastic lifting member (23) are provided in the immersion pool (21) for elastically supporting the movable fork plate (31); a rotating shaft (311) is provided on one end of the movable fork plate (31); a semicircular groove (221) is provided on the first elastic lifting member (22); and the rotating shaft (311) is rotatably provided in a movable ring formed by the semicircular buckle (15) and the semicircular groove (221); A notch is provided on one side of the initial section of the guide member (16); a guide groove (161) is provided on the upper end surface of the guide member (16); a top contact member (162) is elastically and slidably provided on the guide groove (161); and a blocking rod (1621) is provided on the top contact member (162) for blocking the valve stem head from falling off; The detection device (4) comprises a limit frame (41), a limit piece (411) and a visual camera (412) are arranged on the limit frame (41), a power roller is arranged on the limit piece (411), the valve stem contacts the limit piece (411), the power roller can drive the valve stem to rotate, and the visual camera (412) can perform visual detection on the stem to identify colored cracks.

2. The valve stem crack detection structure according to claim 1, characterized in that: The lifting and rotating device (3) further comprises a rotating plate (32), one end of which is rotatably connected to the middle position of the movable fork plate (31), and the other end of which is rotatably connected to the top end of the telescopic rod of the lifting member (33).

3. The valve stem crack detection structure according to claim 1, characterized in that: The colored cleaning liquid includes 1-20% of a colorant and 10-45% of a washing aid by weight. The washing aid is used to clean the oil stains on the valve stem, and the colorant can penetrate into the cracks on the surface of the valve stem to color it.

4. The valve stem crack detection structure according to claim 1, characterized in that: The C-shaped opening edge at the upper end of the movable fork plate (31) is evenly provided with pits, and when the movable fork plate (31) is tilted, the valve stem vibrates and slides downward, and the excess colored cleaning liquid on the valve stem is shaken off.

5. The valve stem crack detection structure according to claim 1, characterized in that: The limit frame (41) is provided with a hydraulic cylinder, which is arranged on the side of the guide member (16) through the hydraulic cylinder guide telescopic arrangement. When the hydraulic cylinder is retracted, the limit frame (41) can extend into the notch of the guide member (16), and then when the valve stem slides onto the guide member (16), the head of the valve stem is suspended on the guide member (16), and the stem portion of the valve stem is pressed against the limit member (411).

6. The valve stem crack detection structure and the feeder having the detection structure according to claim 1, characterized in that: A winding disk is provided inside the top contact member (162), one end of a rope is provided on the winding disk, and the other end is connected to the lower end of the guide groove (161). When the visual camera (412) detects that there is a coloring mark on the valve stem, the winding disk is controlled to start and drive the top contact member (162) to move toward the lower end of the guide groove (161), so that the suspension fulcrum of the valve stem head disappears and the valve stem automatically falls downward.

7. A material loader having a valve stem crack detection structure according to any one of claims 1 to 6, characterized in that: The main frame (1) is a main body of a feeding machine, and the feeding machine enables each valve stem that falls on the movable fork plate (31) to be single, and the valve stem is oriented toward the semicircular buckle (15); The qualified valve stems are sent to the next process along the guide member (16). At the same time, a spray device is also provided on the guide member (16) to spray clean water on the passing valve stems for cleaning.

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