A positioning fixture for machining of a part

Abstract

The present application relates to part processing auxiliary equipment technical field, specifically to a kind of positioning fixture for part processing, positioning fixture for part processing includes base, positioning pin is provided on base, positioning pin is sleeved with knob when using;Two sliding seats are also oppositely provided on base, and sliding seat can slide in the direction away from or close to positioning pin;Each sliding seat is provided with the clamping station corresponding with positioning pin;Each clamping station is provided with jack, isolation belt and two rotating rods, and jack can elastically slide along the radial direction of positioning pin;Two rotating rods are elastically rotatably arranged on the two sides of jack respectively;Two ends of isolation belt are wound on two rotating rods respectively, and can be partially wrapped on half week of knob;Jack is configured to form stop cooperation with isolation belt, and can drive part of isolation belt to be inserted into groove on knob simultaneously.Thereby, through isolation belt, while isolating jack and knob, improve clamping stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of part processing auxiliary equipment, in particular to a positioning clamp for part processing. BACKGROUND

[0002] The knob is a common part, which, in use, converts mechanical rotary motion into a device function adjustment signal through the turning operation of the knob by hand, thereby realizing the control of the target parameter.

[0003] In the processing of the knob, in order to ensure that the knob and the plug of the device form a stable connection, a ring groove is usually milled on the inner peripheral wall of the knob, so that the table-shaped structure on the plug of the device can be inserted into the ring groove; and in the milling process, the knob usually needs to be fixed and clamped to maintain the milling precision.

[0004] When the knob is fixed and clamped, since the outer peripheral wall of the knob is usually provided with a plurality of protrusions spaced apart in the circumferential direction, the protrusions are arranged to facilitate the turning of the hand, and a groove is naturally formed between adjacent protrusions, therefore, two groups of top pins are usually arranged on the two sides of the knob, the top pins can be inserted into the groove and can elastically slide along the extension direction of the top pins, so as to realize the fixed clamping of the knob.

[0005] However, in the process of milling the knob, the groove is prone to residual debris generated in the previous process, when the top pin is inserted into the groove, the debris will be pressed between the contact surface of the top pin and the groove, and form a local high pressure, thereby easily causing the surface of the knob to appear wear and scratches; and when the circumferential cutting force generated by milling exceeds the elastic restraint force of the top pin, the knob will rotate slightly, causing relative sliding with the top pin, at this time, the debris plays a grinding role in the relative sliding, further wearing the surface of the knob, affecting the surface quality of the knob. SUMMARY

[0006] Therefore, it is necessary to provide a positioning clamp for part processing in view of the problems of unstable clamping and easy surface wear in the current knob milling process.

[0007] The above purpose is realized by the following technical scheme:

[0008] The utility model provides a positioning fixture for part processing, positioning fixture for part processing includes the base, is provided with at least one positioning pin on the base, the positioning pin is set with the knob when using, when the number of positioning pin is multiple, multiple positioning pins are side by side arrangement, the base is also oppositely provided with two sliding seats, and two sliding seats are arranged at the both sides of positioning pin respectively, and can slide along the direction of far or close to positioning pin, at least one clamping station is provided on each sliding seat, and clamping station and positioning pin correspond to set, the top pin is arranged at each clamping station, and the top pin extends along the radial direction of positioning pin, and is connected through the first elastic element and sliding seat, under the action of first elastic element, the top pin has the tendency of close to positioning pin, two rotary rods are arranged at the both sides of top pin respectively, and can rotate around the axis of itself, and are connected through the second elastic element and sliding seat respectively, both ends of the isolation belt are wound on two rotary rods respectively, under the action of second elastic element, the isolation belt has the tendency of tension, and the isolation belt is configured to be able to be partially wrapped on the half circle of knob, and also can form friction fit with knob, the top pin is configured to be able to form stop fit with isolation belt, and also can drive part of isolation belt to insert into the groove on knob.

[0009] Further, a limiting ring is fixedly sleeved on one of the rotary rods at each clamping station on one side of the sliding seat, a plurality of first insertion slots are arranged on the circumferential side wall of the limiting ring in the circumferential direction, and an insertion rod is arranged at each clamping station on the same side of the sliding seat, the insertion rod is arranged perpendicularly to the top pin, can form stop fit with the top pin, can be inserted into the first insertion slot, and is connected to the sliding seat through a third elastic element, and under the action of the third elastic element, the insertion rod has a tendency to move away from the limiting ring.

[0010] Further, a gear is fixedly sleeved on one of the rotary rods at each clamping station on the other side of the sliding seat, a sliding block is arranged at each clamping station on the same side of the sliding seat, the sliding block can slide in the extension direction of the top pin, the first elastic element is connected between the top pin and the sliding block, and a rack is fixedly arranged on the sliding block, the rack extends in a direction parallel to the top pin, and is engaged with the gear.

[0011] Further, the third elastic element is a second compression spring.

[0012] Further, the third elastic element is a rubber block.

[0013] Further, the first elastic element is a first compression spring.

[0014] Further, the second elastic element is a coil spring.

[0015] Further, two slide rods are arranged on the base, the slide rods extend in a direction parallel to the top pin, the two slide rods are arranged at intervals in the arrangement direction of the positioning pin, and the sliding seat is simultaneously sleeved on the two slide rods.

[0016] Further, the positioning clamp for part machining further comprises a driving assembly, the driving assembly comprising two driving members configured to provide a driving force for the sliding of the sliding seat.

[0017] Further, the driving member is a pneumatic cylinder.

[0018] The present application has the following advantages:

[0019] The present application relates to a positioning clamp for part machining, which realizes the preliminary positioning of the knob by setting the positioning pin, and realizes the contact clamping of the knob by the top pin and the isolation belt through the sliding characteristics of the sliding seat, and simultaneously realizes the isolation of the top pin and the knob by the isolation characteristics of the isolation belt, so as to avoid the direct contact between the top pin and the knob, and to avoid the local high pressure of the residual debris in the groove, thereby reducing the abrasion and scratches on the surface of the knob; at the same time, the isolation belt is wrapped on the knob by the wrapping characteristics of the isolation belt, so as to increase the contact area with the knob, improve the clamping stability of the knob, reduce the abrasion of the debris on the surface of the knob, and ensure the surface quality of the knob.

[0020] Further, by setting the limiting ring and the plug rod matched therewith, when the protrusions on the top pin and the knob correspond, the plug rod is moved into the first insertion slot in the limiting ring by the stop cooperation between the plug rod and the top pin, so as to limit the rotation of one of the rotating rods, and the other rotating rod is rotated and drives the isolation belt to move, the isolation belt drives the knob to rotate, so that the protrusions on the top pin and the knob correspond, and finally the top pin can drive part of the isolation belt to be inserted into the groove on the knob, thereby realizing stable clamping, so that the adjustment of the position of the knob can be automatically realized.

[0021] Further, by setting the gear and the rack engaged therewith, the rack is fixed with a sliding block, and the sliding characteristics of the sliding block and the characteristics of the first elastic member and the top pin are utilized, when the circumferential cutting force generated by milling exceeds the elastic constraint force between the top pin and the isolation belt, the knob drives the isolation belt to slide, the isolation belt drives the gear to rotate through the rotating rod, the rack drives the sliding block to move close to the top pin, and the first elastic member is simultaneously compressed, so as to increase the clamping force of the top pin on the knob, which not only ensures stable clamping, but also avoids the use of excessive clamping force to clamp the knob at the beginning, and avoids the damage to the surface of the knob. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The present application provides a positioning clamp for part machining, which is a perspective view of the clamp when clamping the knob;

[0023] Figure 2The schematic diagram of the sectional structure of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0024] Figure 3 The positioning fixture for part machining provided by the embodiment of the present application is used for clamping the knob; Figure 2 The schematic diagram of the local enlarged structure at W in the figure;

[0025] Figure 4 The positioning fixture for part machining provided by the embodiment of the present application is used for clamping the knob; Figure 2 The schematic diagram of the local enlarged structure at X in the figure;

[0026] Figure 5 The schematic diagram of the front structure of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0027] Figure 6 The positioning fixture for part machining provided by the embodiment of the present application is used for clamping the knob; Figure 5 The sectional view of A-A in the figure;

[0028] Figure 7 The positioning fixture for part machining provided by the embodiment of the present application is used for clamping the knob; Figure 6 The schematic diagram of the local enlarged structure at Y in the figure;

[0029] Figure 8 The positioning fixture for part machining provided by the embodiment of the present application is used for clamping the knob; Figure 6 The schematic diagram of the local enlarged structure at Z in the figure;

[0030] Figure 9 The first state diagram of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0031] Figure 10 The second state diagram of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0032] Figure 11 The third state diagram of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0033] Figure 12 The fourth state diagram of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0034] Figure 13 The fifth state diagram of the positioning fixture for part machining provided by the embodiment of the present application when clamping the knob is shown in the figure;

[0035] Figure 14 The schematic diagram of the slider of the positioning fixture for part machining provided by the embodiment of the present application is shown in the figure;

[0036] Figure 15 The schematic diagram of the knob that can be clamped by the positioning fixture for part machining provided by the embodiment of the present application is shown in the figure.

[0037] Wherein:

[0038] 1, base; 101, positioning pin; 102, bracket; 103, slide bar;

[0039] 2, sliding seat; 201, clamping station; 202, second slot; 203, first cavity; 204, second cavity; 205, cover;

[0040] 3, ejector pin;

[0041] 4, isolation belt;

[0042] 5, rotating rod; 501, limiting ring; 5011, first slot; 502, gear;

[0043] 6, first compression spring;

[0044] 7, coil spring;

[0045] 8, insertion rod;

[0046] 9, second compression spring;

[0047] 10, sliding block; 1001, rack;

[0048] 1101, air cylinder;

[0049] 12, knob; 1201, ring groove; 1202, protrusion; 1203, groove. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with examples and in conjunction with the drawings. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0051] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. In this paper, "connection" and "coupling" include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] The following reference Figures 1 to 14 This invention describes a positioning fixture for machining parts, specifically suitable for clamping knob 12; as shown in the embodiments of the invention. Figure 15 As shown, the knob 12 has a ring-shaped structure and is T-shaped. A ring groove 1201 is coaxially formed on the inner peripheral wall of the large end of the knob 12. When installed, the ring groove 1201 is fitted onto the platform-shaped structure on the connector of the device, thereby achieving a stable connection with the connector of the device. Multiple protrusions 1202 are provided on the outer peripheral wall of the large end of the knob 12. The multiple protrusions 1202 are arranged at equal intervals along the circumference. The arrangement of the protrusions 1202 makes it easy for people to turn it by hand. A groove 1203 is naturally formed between adjacent protrusions 1202.

[0054] Specifically, the positioning fixture for part processing includes a base 1; at least one positioning pin 101 is fixedly installed on the top of the base 1, the positioning pin 101 is vertically arranged, taking four positioning pins 101 as an example, the four positioning pins 101 are arranged at equal intervals in the left and right direction; the knob 12 is sleeved on the top of the positioning pin 101 during installation, thereby achieving initial positioning; two sliding seats 2 are also provided on the top of the base 1, the two sliding seats 2 are spaced apart and opposite to each other in the front and back direction, and are respectively located on the front and back sides of the positioning pin 101, and can slide in the direction away from or towards the positioning pin 101. To facilitate the sliding of the sliding seats 2, the positioning fixture for part processing also includes a drive assembly, the drive assembly includes two drive components, the drive components can be configured as drive cylinders, the drive cylinders are installed on the top of the base 1 during installation, the two drive cylinders are spaced apart in the front and back direction, and are respectively located on the front and back sides of the two sliding seats 2, the output shaft of the drive cylinder faces the sliding seat 2 and is fixedly connected to the sliding seat 2, so as to facilitate the sliding of the sliding seat 2.

[0055] Understandably, the drive cylinder can be any of the following: a hydraulic cylinder, a pneumatic cylinder 1101, or an electric cylinder.

[0056] At least one clamping station 201 is arranged on each sliding seat 2 and is arranged in correspondence with the positioning pin 101; when the number of the positioning pin 101 is four, the number of the clamping station 201 arranged on each sliding seat 2 is also four, the four clamping stations 201 on the same sliding seat 2 are arranged equidistantly along the left-right direction and are arranged in one-to-one correspondence with the positioning pin 101; at each clamping station 201, a second slot 202 is arranged on the side wall of the sliding seat 2 close to each other, the second slot 202 penetrates the top and the bottom of the sliding seat 2 along the up-down direction, the shape of the second slot 202 is the same as the outer half circumference of the knob 12, so that the knob 12 can be embedded in the second slot 202 during installation.

[0057] At each clamping station 201, a first cavity 203 is arranged on the top of the sliding seat 2, the first cavity 203 and the second slot 202 are arranged opposite along the front-rear direction and are communicated with each other; a top pin 3 is inserted and arranged in each first cavity 203, the top pin 3 extends horizontally along the front-rear direction and is inserted into the second slot 202 and connected with the sliding seat 2 through the first elastic piece, under the action of the first elastic piece, the top pin 3 has a tendency to be close to the positioning pin 101; the first elastic piece can be a first compression spring 6, the first compression spring 6 is inserted and arranged in the first cavity 203 and extends horizontally along the front-rear direction and is located between the sliding seat 2 and the top pin 3, the two ends of the first compression spring 6 are connected with the sliding seat 2 and the top pin 3 respectively.

[0058] Initially, the two sliding seats 2 are arranged away from each other; the top pin 3 extends into the second slot 202.

[0059] Taking the driving piece arranged as the air cylinder 1101 as an example. During use, first, the four knobs 12 are respectively sleeved on the top of the four positioning pins 101, and the recess 1203 is arranged in correspondence with the top pin 3; then, the two air cylinders 1101 are started, the output shaft of the air cylinder 1101 is stretched out, and the sliding seat 2 is driven to be close to the positioning pin 101. During the movement of the sliding seat 2, when the top pin 3 contacts the knob 12, with the continuous movement of the sliding seat 2, the top pin 3 gradually inserts into the first cavity 203 under the pushing of the knob 12, and the first compression spring 6 is compressed synchronously; when the knob 12 is embedded in the second slot 202, the top pin 3 moves inward to the limit position, and the top pins 3 on the front and rear sides of the same knob 12 are tightly clamped on the knob 12 under the action of the first compression spring 6, so as to realize the fixed clamping of the knob 12. Then, the ring groove 1201 can be milled on the inner circumferential wall of the large end of the knob 12 by a milling cutter.

[0060] Although the above process can achieve fixed clamping of the knob 12, however, during the milling process of the milling cutter on the inner wall of the knob 12, the elastic clamping of the knob 12 by the ejector pin 3 will indirectly cause damage to the surface quality of the knob 12. The root cause of the problem mainly comes from two aspects, and the interaction between the two exacerbates the degree of surface damage of the knob 12: Firstly, during the whole process of processing the knob 12, the cutting and polishing processes in the early stage will generate fine debris. These debris may be attached to the groove 1203 due to electrostatic adsorption, gravity accumulation, etc. When the ejector pin 3 is inserted into the groove 1203, the extrusion of the ejector pin 3 and the inner wall of the groove 1203 will embed these debris between the contact surface of the ejector pin 3 and the groove 1203. At this time, the debris is equivalent to hard particles, which will form a local high pressure in the contact area, and lay hidden dangers for subsequent surface wear and scratches. Secondly, although the ejector pin 3 is in close contact with the groove 1203 through elastic sliding, the elastic design itself has the characteristic of deformability. That is, when the milling cutter mills the inner wall of the knob 12, the milling cutter will exert a continuous circumferential cutting force on the knob 12. When this cutting force exceeds the circumferential restraining force provided by the first compression spring 6 through the ejector pin 3, the knob 12 will overcome the elastic limit of the ejector pin 3 and rotate slightly in the circumferential direction, thereby causing relative sliding between the knob 12 and the ejector pin 3, resulting in an increase in the surface roughness of the inner wall of the groove 1203 and damaging the original processing surface quality.

[0061] When the above two situations exist at the same time, the surface damage problem will be further exacerbated: during the relative sliding of the knob 12 and the ejector pin 3, the debris in the groove 1203 will grind between the contact surfaces of the two. The debris will not only cause wear to the contact surface of the ejector pin 3, but also cause scratches to the inner wall of the groove 1203, forming obvious scratches. These damages not only affect the appearance of the knob 12, but also may cause stress concentration due to surface scratches, reducing the structural strength of the knob 12, and even affecting the service life and operation feel of the knob 12 due to the aggravation of wear at the scratches during long-term use.

[0062] Based on this, in the positioning fixture for part machining provided by the embodiment of the application, two second cavities 204 are arranged on the top of the sliding seat 2 at each clamping station 201, the two second cavities 204 are respectively located on the left and right sides of the first cavity 203, and are in communication with the second slot 202 and are symmetrically arranged about the first cavity 203; a rotating rod 5 is inserted and arranged in each second cavity 204, the rotating rod 5 is vertically arranged, the bottom end is inserted into the inside of the sliding seat 2, the top end is suspended and arranged, and can rotate about the axis thereof, and the two rotating rods 5 at the same clamping station 201 are symmetrically arranged about the first cavity 203; the same isolation belt 4 is wound on the two rotating rods 5 at each clamping station 201, and the winding directions of the isolation belt 4 on the two rotating rods 5 at the same clamping station 201 are opposite, for example, the isolation belt 4 can be gradually wound on the rotating rod 5 on the right side of the rear sliding seat 2 when the rotating rod 5 rotates in the clockwise direction, the isolation belt 4 can be gradually wound on the rotating rod 5 on the left side of the rear sliding seat 2 when the rotating rod 5 rotates in the counterclockwise direction, the isolation belt 4 can be gradually wound on the rotating rod 5 on the left side of the front sliding seat 2 when the rotating rod 5 rotates in the counterclockwise direction, and the isolation belt 4 can be gradually wound on the rotating rod 5 on the right side of the rear sliding seat 2 when the rotating rod 5 rotates in the clockwise direction; and the belt surface of the isolation belt 4 is vertically arranged.

[0063] Taking one of the isolation belts 4 on the rear sliding seat 2 as an example, after the right end of the isolation belt 4 is wound on the rotating rod 5 on the right side, the left end passes through the gap between the second cavity 204 on the right side and the sliding seat 2, extends forward, is then bent by 90 degrees to the left, then extends to the left through the second slot 202, and extends to the gap between the second cavity 204 on the left side and the sliding seat 2, is then bent by 90 degrees to the right, then extends to the right and passes through the gap between the second cavity 204 on the left side and the sliding seat 2, and finally is wound on the rotating rod 5 on the left side; each rotating rod 5 is connected with the sliding seat 2 through a second elastic member, the second elastic member can be a coil spring 7 and is located below the isolation belt 4, the coil spring 7 is sleeved on the rotating rod 5, the inner end is fixedly connected with the rotating rod 5, and the outer end is fixedly connected with the sliding seat 2; under the action of the coil spring 7, the rotating rod 5 on the right side of the rear sliding seat 2 has a tendency to rotate in the clockwise direction, the rotating rod 5 on the left side of the rear sliding seat 2 has a tendency to rotate in the counterclockwise direction, so that the isolation belt 4 has a tendency to be tensioned; the rotating rod 5 on the right side of the front sliding seat 2 has a tendency to rotate in the counterclockwise direction, and the rotating rod 5 on the left side of the front sliding seat 2 has a tendency to rotate in the clockwise direction, so that the isolation belt 4 has a tendency to be tensioned.

[0064] Initially, the two sliding seats 2 are arranged away from each other; and the top pin 3 extends into the second slot 202.

[0065] Take the drive member as an example, which is provided as the air cylinder 1101. In use, first, the four knobs 12 are respectively sleeved on the top of the four positioning pins 101, and the recesses 1203 and the top pins 3 are correspondingly arranged; then, the two air cylinders 1101 are started, the output shaft of the air cylinder 1101 is extended, and the sliding seat 2 is driven to move close to the positioning pin 101. In the moving process of the sliding seat 2, when the knob 12 and the isolation belt 4 are in contact, with the continuous movement of the sliding seat 2, the isolation belt 4 at the second slot 202 gradually transitions from a straight line to an arc shape under the pushing of the knob 12, and finally wraps around half of the circumference of the knob 12; in the deformation process of the isolation belt 4, the two rotating rods 5 at the same clamping station 201 rotate in opposite directions, synchronously releasing the isolation belt 4 wound thereon, and making the coil spring 7 store energy; after the isolation belt 4 and the top pin 3 are in contact, the isolation belt 4 and the top pin 3 form a stop cooperation, with the continuous movement of the sliding seat 2, the isolation belt 4 continues to deform under the pushing of the knob 12, the top pin 3 gradually inserts into the first cavity 203, and synchronously compresses the first compression spring 6; when the knob 12 is embedded in the second slot 202, the top pin 3 moves inward to the limit position, at this time, the top pins 3 on the front and back sides of the same knob 12 are tightly clamped against the knob 12 under the action of the first compression spring 6, and the isolation belt 4 wraps around half of the circumference of the knob 12, thereby realizing the fixed clamping of the knob 12. Subsequently, a ring groove 1201 can be milled on the inner circumferential wall of the large end of the knob 12 by a milling cutter.

[0066] In this way, by arranging the isolation belt 4, the direct contact between the top pin 3 and the knob 12 is converted into indirect contact of the top pin 3-isolation belt 4-knob 12, and at the same time, the isolation belt 4 itself has a certain flexibility and toughness, can conform to the outer circumferential contour of the knob 12, avoids direct contact between the top pin 3 and the debris, and can disperse the clamping pressure of the top pin 3 through its own buffering characteristics, prevents the formation of high pressure in the local debris, thereby reducing surface wear and scratches caused by debris from the source; can also greatly increase the contact area with the knob 12, make the clamping force act on a larger area of the outer circumference of the knob 12, and form a more uniform circumferential constraint. At the same time, under the action of the coil spring 7, the isolation belt 4 is always in a tension state, can form a stable friction fit with the outer circumferential wall of the knob 12 - this friction fit can provide additional circumferential resistance, effectively offset part of the milling cutting force, and reduce the probability of relative sliding of the knob 12. Even if there is a slight tendency to slide, the friction between the isolation belt 4 and the knob 12 can buffer the sliding speed and intensity, avoid the severe wear caused by the direct sliding of the top pin 3 and the knob 12, and thus ensure the clamping stability while effectively maintaining the surface processing quality of the knob 12.

[0067] In further embodiments, the clamping mode relying on the cooperation between the top pin 3 and the groove 1203 has a key prerequisite: it is necessary to ensure that the top pin 3 can be accurately aligned and inserted into the groove 1203, which requires accurate adjustment of the position of the knob 12 before clamping. The existing adjustment mode of the position of the knob 12 mainly includes two types. One is the manual adjustment mode, which relies on the visual judgment and manual operation of the operator. The operator needs to observe the placement angle of the knob 12 one by one and align the groove 1203 with the top pin 3 by manually rotating the knob 12. The core problem is low efficiency: the speed of manual judgment and operation is much lower than that of mechanical automation process, and long-time operation can easily cause personnel fatigue, resulting in judgment errors or operation deviations, further reducing the adjustment accuracy and efficiency, and cannot meet the needs of large-scale batch production.

[0068] The other is the auxiliary equipment adjustment mode. The general process of this mode is as follows: first, the knob 12 is conveyed along a preset track to a sorting station by a vibrating disc. The vibrating disc uses vibration force to comb the randomly stacked knobs 12 into a unified posture and convey them in an orderly manner. Then, the knob 12 at the sorting station is sucked up by a suction cup. At this time, the position and posture of the knob 12 on the suction cup need to be detected by a vision sensor to determine whether the groove 1203 is aligned with the direction of the top pin 3. If the position is incorrect, the suction cup needs to be driven to rotate the knob 12 until the knob 12 is adjusted to the appropriate position. Finally, the knob 12 with the adjusted position is conveyed to clamping by moving the suction cup, and the subsequent clamping of the top pin 3 is completed. However, this auxiliary equipment adjustment mode also has significant problems. From the equipment cost point of view, the vibrating disc, suction cup, vision sensor, and mechanism for driving the rotation and movement of the suction cup are all high-precision automated components, and the purchase, installation, and debugging costs of the entire set of equipment are high. From the operation process point of view, the “conveying-sucking-detecting-adjusting-conveying” multiple links need to be completed in sequence, and precise coordination is required between each link. Any failure in any link (such as vibrating disc jamming, vision sensor misjudgment, suction cup leakage, etc.) will cause the entire process to be interrupted, and the operation complexity is greatly improved. From the processing efficiency point of view, although it is improved compared with manual adjustment, the sequential performance of multiple links still occupies a lot of time, especially the vision detection and rotation adjustment links, which require a certain response time, making it difficult to further improve the overall processing rhythm, and ultimately leading to the inability to achieve the ideal level of processing efficiency.

[0069] Based on this, in the positioning fixture for part machining provided by the embodiment of the application, the limit ring 501 is fixedly sleeved on the rotating rod 5 located at the left side at each clamping station 201 located on the sliding seat 2 located at the rear side, the limit ring 501 is located between the isolation belt 4 and the coil spring 7, a plurality of first insertion grooves 5011 are arranged on the circumferential side wall of the limit ring 501 and are equidistantly arranged in the circumferential direction, the insertion rod 8 is inserted at the junction of the first cavity 203 and the second cavity 204 located at the left side at each clamping station 201 located on the sliding seat 2 located at the rear side, the insertion rod 8 extends in the left-right direction, the left end is inserted into the second cavity 204 located at the left side, the right end is inserted into the first cavity 203, the insertion rod 8 can form a stop cooperation with the top pin 3 and can be inserted into the first insertion groove 5011, so as to facilitate locking the position of the rotating rod 5 where the insertion rod 8 is located under the driving of the top pin 3, the insertion rod 8 is connected with the sliding seat 2 through the third elastic member, under the action of the third elastic member, the insertion rod 8 has a tendency to move away from the limit ring 501, and the insertion rod 8 is convenient for resetting, the third elastic member can be the second compression spring 9, and the second compression spring 9 is sleeved on the insertion rod 8 and located in the first cavity 203 during installation, and the second compression spring 9 is connected between the left side wall of the first cavity 203 and the insertion rod 8.

[0070] Initially, the two sliding seats 2 are arranged away from each other, the top pin 3 extends into the second insertion groove 202, and the insertion rod 8 is arranged away from the limit ring 501.

[0071] During use, there are three situations of the position of the knob 12: the groove 1203 corresponds to the top pin 3, the protrusion 1202 corresponds to the top pin 3, and the junction of the groove 1203 and the protrusion 1202 corresponds to the top pin 3. Among them, when the groove 1203 corresponds to the top pin 3, the clamping process of the knob 12 is the same as described above, and will not be repeated; when the junction of the groove 1203 and the protrusion 1202 corresponds to the top pin 3, after the top pin 3 contacts the isolation belt 4, under the pushing of the top pin 3, the knob 12 will automatically rotate to correspond to the groove 1203 and the top pin 3, and the remaining process is the same, and will not be repeated.

[0072] As Figure 9As shown, the protrusion 1202 and the ejector pin 3 correspond at this time; then the cylinder 1101 at the front side is started, the output shaft of the cylinder 1101 is extended, and the sliding seat 2 at the front side is driven to move backward synchronously. During the movement of the sliding seat 2 at the front side, when the knob 12 and the isolation belt 4 are in contact, with the continuous movement of the sliding seat 2, the isolation belt 4 at the second slot 202 is gradually deformed from a straight line to an arc shape under the pushing of the knob 12, and finally wraps around half of the circumference of the knob 12; during the deformation of the isolation belt 4, the two rotating rods 5 at the same clamping station 201 rotate reversely, synchronously release the isolation belt 4 wound thereon, and make the coil spring 7 store energy; after the isolation belt 4 and the ejector pin 3 are in contact, the isolation belt 4 and the ejector pin 3 form a stop cooperation, with the continuous movement of the sliding seat 2, the isolation belt 4 continues to deform under the pushing of the protrusion 1202, the ejector pin 3 gradually inserts into the first cavity 203, and the first compression spring 6 is compressed synchronously; when the knob 12 is about to be embedded in the second slot 202, as shown, the ejector pin 3 moves inward to the proximity limit position. Figure 10

[0073] Then the cylinder 1101 at the rear side is started, the output shaft of the cylinder 1101 is extended, and the sliding seat 2 at the rear side is driven to move forward synchronously. During the movement of the sliding seat 2 at the rear side, when the knob 12 and the isolation belt 4 are in contact, with the continuous movement of the sliding seat 2, the isolation belt 4 at the second slot 202 is gradually deformed from a straight line to an arc shape under the pushing of the knob 12, and finally wraps around half of the circumference of the knob 12; during the deformation of the isolation belt 4, the two rotating rods 5 at the same clamping station 201 rotate reversely, synchronously release the isolation belt 4 wound thereon, and make the coil spring 7 store energy; after the isolation belt 4 and the ejector pin 3 are in contact, the isolation belt 4 and the ejector pin 3 form a stop cooperation; with the continuous movement of the sliding seat 2, the isolation belt 4 continues to deform under the pushing of the protrusion 1202, the ejector pin 3 gradually inserts into the first cavity 203, and the first compression spring 6 is compressed synchronously; when the knob 12 is about to be embedded in the second slot 202, as shown, the ejector pin 3 moves inward to the proximity limit position; with the continuous movement of the sliding seat 2, the isolation belt 4 continues to deform under the pushing of the protrusion 1202, the ejector pin 3 continues to insert into the first cavity 203, and then forms a stop cooperation with the insertion rod 8; with the continuous movement of the ejector pin 3, as shown, the insertion rod 8 moves to the left and inserts into the first slot 5011, at this time, the rotating rod 5 at the left side cannot rotate; with the continuous movement of the ejector pin 3, at this time, the isolation belt 4 continues to deform, because the rotating rod 5 at the left side cannot rotate, the rotating rod 5 at the right side continues to rotate, and makes the isolation belt 4 in the second slot 202 move, synchronously drives the knob 12 to rotate through the friction cooperation, as shown. Figure 11 Figure 12 Figure 13 ​​​As shown, after the knob 12 is rotated, the groove 1203 corresponds to the top pin 3, the first compression spring 6 is released at the same time, the top pin 3 is inserted into the groove 1203, and then stable clamping is realized.

[0074] In this way, the adjustment of the position of the knob 12 can be automatically realized, compared with the manual adjustment mode, the dependence on human judgment and operation is fundamentally eliminated, and the adjustment efficiency and accuracy stability are greatly improved; compared with the auxiliary equipment adjustment mode, the adjustment process is simplified, the equipment cost and failure risk are reduced, and the overall processing continuity is improved.

[0075] In further embodiments, in order to improve the clamping effect of the knob 12, a gear 502 is fixedly sleeved on the rotating rod 5 located on the left side at each clamping station 201 on the sliding seat 2 located on the front side; a sliding block 10 is inserted in the first cavity 203 at each clamping station 201 on the sliding seat 2 located on the front side, and the sliding block 10 can slide in the front-rear direction; the first compression spring 6 is connected between the top pin 3 and the sliding block 10; a rack 1001 is fixedly arranged on the sliding block 10, the rack 1001 extends in the front-rear direction, and is engaged with the gear 502.

[0076] During use, when the circumferential cutting force generated by milling exceeds the elastic constraint force of the top pin 3 and the isolation belt 4, the knob 12 rotates in the counterclockwise direction, synchronously driving the isolation belt 4 located on the front side and at the second slot 202 to slide to the right, and when the isolation belt 4 slides, the rotating rod 5 located on the left side at each clamping station 201 on the sliding seat 2 located on the front side is synchronously driven to rotate in the counterclockwise direction, and when the rotating rod 5 rotates, the sliding block 10 is synchronously driven to move backward through the engagement between the gear 502 and the rack 1001, and the first compression spring 6 is compressed, so that the clamping force of the top pin 3 on the knob 12 is increased, which not only ensures stable clamping, but also avoids using too large clamping force to clamp the knob at the beginning, and avoids damaging the surface of the knob.

[0077] In other embodiments, the third elastic member can also be a rubber block, which has a sleeve structure and extends in the front-rear direction, and is installed in the first cavity 203 and sleeved on the insertion rod 8 and connected between the left side wall of the first cavity 203 and the insertion rod 8.

[0078] In some other embodiments, in order to improve the stability of the sliding seat 2 when sliding, four supports 102 are further fixedly arranged on the top of the base 1. The four supports 102 are divided into two groups, and the two groups of supports 102 are arranged in the left-right direction and are located on the left and right sides of the air cylinder 1101 respectively. The two supports 102 in the same group are arranged in the front-rear direction. The two supports 102 in the same group are both inserted with a slide rod 103, the slide rod 103 extends in the front-rear direction, and the sliding seat 2 is simultaneously sleeved on the two slide rods 103 during installation. In this way, under the guidance and support of the slide rods 103, the sliding seat 2 can slide more stably.

[0079] In some other embodiments, in order to avoid the impurities from the outside entering into the first cavity 203 and the second cavity 204, thereby affecting the sliding of the ejector pin 3 and the sliding block 10, a cover 205 is fixedly arranged on the top of each sliding seat 2, and the cover 205 simultaneously blocks the first cavity 203 and the second cavity 204.

[0080] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0081] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A positioning jig for machining of a part, characterized by, The positioning fixture for part machining is used for clamping knobs (12) and comprises a base (1) provided with at least one positioning pin (101), which is sleeved with the knob (12) in use, and when the number of the positioning pins (101) is multiple, the multiple positioning pins (101) are arranged side by side; the base (1) is also oppositely provided with two sliding seats (2), which are arranged in a front-rear direction and are located on the front and rear sides of the positioning pin (101) respectively and can slide away from or close to the positioning pin (101); at least one clamping station (201) is arranged on each sliding seat (2), and the clamping station (201) and the positioning pin (101) are correspondingly arranged; a second slot (202) is formed in the side wall of the sliding seat (2) close to each other, and the shape of the second slot (202) is the same as the outer half circumference shape of the knob (12); a jack (3), an isolation belt (4) and two rotating rods (5) are arranged at each clamping station (201), the jack (3) extends horizontally along the front-rear direction and is connected with the sliding seat (2) through a first elastic member, and under the action of the first elastic member, the jack (3) has a tendency to close to the positioning pin (101); the two rotating rods (5) are arranged on the two sides of the jack (3) respectively and can rotate around their own axes and are connected with the sliding seat (2) through a second elastic member respectively; one end of the isolation belt (4) is wound on one of the rotating rods (5), then passes through the second slot (202), and the other end is wound on the other rotating rod (5), and under the action of the second elastic member, the isolation belt (4) has a tendency to be tensioned, and the isolation belt (4) is configured to be able to be partially wrapped on the half circumference of the knob (12) and to form a friction fit with the knob (12); the jack (3) is configured to form a stop fit with the isolation belt (4) and to drive part of the isolation belt (4) to be inserted into the groove (1203) on the knob (12).

2. The positioning jig for machining of a part according to claim 1, characterized in that, One of the rotating rods (5) at each clamping station (201) on one side of the sliding seat (2) is fixedly sleeved with a limiting ring (501), and a plurality of first slots (5011) are arranged on the circumferential side wall of the limiting ring (501) in a circumferential direction; an insertion rod (8) is arranged at each clamping station (201) on the same side of the sliding seat (2), the insertion rod (8) and the jack (3) are arranged perpendicularly and can form a stop fit with the jack (3) and be inserted into the first slot (5011), and the insertion rod (8) is connected with the sliding seat (2) through a third elastic member, and under the action of the third elastic member, the insertion rod (8) has a tendency to move away from the limiting ring (501).

3. The positioning fixture for machining of a part according to claim 2, characterized in that, One of the rotating rods (5) at each clamping station (201) on the other side of the sliding seat (2) is fixedly sleeved with a gear (502); each clamping station (201) on the same side of the sliding seat (2) is provided with a sliding block (10), the sliding block (10) can slide along the extension direction of the jackscrew (3); a first elastic member is connected between the jackscrew (3) and the sliding block (10); the sliding block (10) is fixedly provided with a gear rack (1001), the gear rack (1001) extends along a direction parallel to the jackscrew (3), and is engaged with the gear (502).

4. The positioning fixture for machining of a part according to claim 2, characterized in that, The third elastic member is a second compression spring (9).

5. The positioning fixture for machining of a part according to claim 2, characterized in that, The third elastic member is a rubber block.

6. The positioning fixture for machining of a part according to claim 1, characterized in that, The first elastic member is a first compression spring (6).

7. The positioning fixture for machining of a part according to claim 1, characterized in that, The second elastic member is a coil spring (7).

8. The positioning fixture for machining of a part according to claim 1, characterized in that, The machine base (1) is further provided with two sliding rods (103), the sliding rods (103) extend along a direction parallel to the jackscrew (3), and the two sliding rods (103) are arranged at intervals along the arrangement direction of the positioning pin (101), and the sliding seat (2) is simultaneously sleeved on the two sliding rods (103).

9. The positioning fixture for machining of a part according to claim 1, characterized in that, The positioning clamp for part machining further comprises a driving assembly, the driving assembly comprising two driving members, the driving members being configured to provide driving force for sliding of the sliding seat (2).

10. The positioning fixture for machining of a part according to claim 9, characterized in that, The driving member is a pneumatic cylinder (1101).

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