A fixture structure for locating a datum hole

Abstract

The present application belongs to the field of clamps, and particularly relates to a clamp structure for positioning a reference hole, comprising a lower clamp plate and an upper clamp plate, a cavity being left between the lower clamp plate and the upper clamp plate, and the two being combined into a clamp table through a surrounding plate; a rough limit of the edge profile of a riveting plate and a workpiece is performed through a limiting piece, a reference hole provided on the riveting plate and the workpiece is matched with a supporting seat to guide a downward pressing process, a proximity switch provided in an inductive seat is matched to perform lower layer laying detection, and an external detection mechanism is matched to perform upper layer levelness detection, so that the problem of machining loss or equipment damage caused by unstable placement of the riveting plate and the workpiece can be effectively prevented; through cooperation between structures, the riveting plate and the workpiece are stably clamped on the clamp table, are supported through the supporting seat at the outer periphery, and are supported through a floating supporting mechanism at the inner periphery, so that the riveting plate and the workpiece will not be damaged under the action of pressure during the riveting process, and stable riveting can be ensured.

Description

Technical Field

[0001] This invention relates to the field of fixtures, and more specifically to a fixture structure for positioning a reference hole. Background Technology

[0002] Riveting machines can be classified into many types according to their structure, including slide rail type and rotary table type, but their principles are similar. They all use settings to move the workpiece to the riveting area, and then the riveting machine completes the riveting process. The displacement of any workpiece can be viewed as the result of movement in three directions: the X and Y axes control left and right, forward and backward, and the Z axis controls up and down. Thus, a basic CNC structure is determined. CNC riveting machines generally have a zero point, also known as a reference point. Using this point as a reference, we need to number and coordinate all the points to be riveted. This process is essential. Then, these coordinates and heights need to be input into the machine's data entry page, allowing the machine to know which points to rivet, where these points are located, and at what height. After inputting these coordinates, the CNC riveting machine's program can operate. Under the control of the program, the machine's servo mechanism will drive the workpiece to the first point we input. At this position, the riveted workpiece should be exactly below the axis of the riveting head. At this point, the machine also needs to calculate the Z value of this coordinate, which is the height value, to determine the riveting feed. Once everything is prepared, the machine can begin riveting.

[0003] The existing technology has the following problems:

[0004] 1. Before riveting, the workpiece and rivet plate need to be horizontally clamped. Due to the lack of detection device in the fixture structure, if the workpiece and rivet plate are offset due to clamping, it may cause minor damage such as riveting misalignment and loss of the workpiece and rivet plate, or even damage to the riveting equipment and fixture structure.

[0005] 2. During riveting, since the workpiece and rivet plate are mostly irregular structures, there is a lack of support in some areas after clamping, which may cause damage to the workpiece and rivet plate during subsequent riveting. Summary of the Invention

[0006] (a) Purpose of the invention

[0007] To address the technical problems existing in the background art, this invention proposes a fixture structure for positioning a reference hole, which features multi-point support to ensure stable force during the riveting process and automatic detection of whether the clamping is stable.

[0008] (II) Technical Solution

[0009] To solve the above technical problems, the present invention provides a fixture structure for positioning a reference hole, including a lower fixture plate and an upper fixture plate, wherein a cavity is left between the lower fixture plate and the upper fixture plate, and the two are combined into a fixture table by a surrounding plate;

[0010] The limiting mechanism includes a first limiting member disposed at the corner of the upper clamping plate, and a second limiting member disposed at the remaining corner;

[0011] The positioning mechanism includes several positioning seats disposed on the upper part of the upper clamping plate, a sensing seat disposed on one side of the positioning seat, a proximity switch mounted on the upper part of the sensing seat, and several support seats disposed on the upper clamping plate.

[0012] The rivet clamping cylinder for holding the rivet plate is located in the middle of the upper clamping plate, and the workpiece clamping cylinder for holding the workpiece is located on the edge of the upper clamping plate.

[0013] The floating support mechanism includes a floating support unit, a floating support cylinder in the middle of the floating support unit, a movable support block at the output end of the floating support cylinder, a positioning pin at the top of the movable support block, a first support rod with a tapered upper part and a square lower part, the movable support block and the lower part of the first support rod being offset, and a movable positioning pin on the side wall of the floating support cylinder, one end of the positioning pin penetrating into the inner cavity of the floating support cylinder being attached to the movable support block;

[0014] The testing mechanism includes a testing cylinder disposed on one side of the upper clamping plate. A movable testing sensor is disposed at the output end of the testing cylinder, and a testing lens is mounted on the testing sensor facing the table surface of the upper clamping plate.

[0015] Preferably, the detection sensor is controlled by the linear displacement of the piston rod at the output end of the detection cylinder, and the displacement direction of the fixture table composed of the lower fixture plate and the upper fixture plate forms a cross with the displacement direction of the detection sensor.

[0016] Preferably, the first limiting member has an "L-shaped" structure and is provided in three sets, and the second limiting member has a "square" structure and is provided in two sets symmetrically. The first limiting member and the second limiting member surround the outer periphery of the workpiece shell.

[0017] Preferably, two sets of positioning seats are provided, located at opposite ends of the clamping area of ​​the fixture table. Each positioning seat is paired with a sensing seat, and the proximity switch located in the "U-shaped" groove of the sensing seat is at the same height as the positioning seat.

[0018] Preferably, the upper part of the support base has a "spherical" structure and is respectively disposed on one side of the first limiting member and the second limiting member.

[0019] Preferably, the rivet clamping cylinder includes a rivet cylinder that penetrates the clamping cavity of the fixture table, and a connecting rod assembly is provided at the output end of the rivet cylinder, with the other end of the connecting rod assembly connected to a rivet pressure head that moves accordingly.

[0020] Preferably, the workpiece clamping cylinder includes a workpiece cylinder that penetrates the clamping cavity of the fixture table, a connecting rod assembly is provided at the output end of the workpiece cylinder, and the other end of the connecting rod assembly is connected to a workpiece pressure head that moves accordingly.

[0021] Preferably, the floating support is partially disposed on the upper part of the upper clamping plate, and the remaining part is disposed in the clamping table cavity. The output end of the floating support in the clamping table cavity is provided with a second support rod that penetrates the upper part of the upper clamping plate, and the length of the second support rod is higher than that of the first support rod.

[0022] Preferably, the purging mechanism includes an internal air blowing device and an external air blowing device. The internal air blowing device is disposed on the upper layer of the upper clamping plate, and air holes are provided at its lower part. A guide plate is clamped between the air holes. The external air blowing device is disposed on one side of the upper clamping plate, and the air outlet of the external air blowing device faces the upper clamping plate.

[0023] The above-described technical solution of the present invention has the following beneficial technical effects:

[0024] 1. The edge contours of the rivet plate and the workpiece are coarsely limited by the limiting component. The reference holes on the rivet plate and the workpiece cooperate with the support base to guide the pressing process. The proximity switch inside the sensing base is used to detect the lower layer flatness, and the external detection mechanism is used to detect the upper layer levelness. This can effectively prevent the problem of processing loss or equipment damage caused by the unstable placement of the rivet plate and the workpiece.

[0025] 2. Through the cooperation between various structures, the rivet plate and the workpiece are stably clamped on the fixture table. They are supported on the outer periphery by the support seat and on the inside by the floating support mechanism, which ensures that the rivet plate and the workpiece will not be damaged under pressure during the riveting process, and ensures the stability of subsequent riveting. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the floating support mechanism of the present invention;

[0028] Figure 3 This is a front view structural diagram of the present invention;

[0029] Figure 4 This is a side view of the structure of the present invention;

[0030] Figure 5 This is a top view of the structure of the present invention.

[0031] Figure label:

[0032] 11. Lower clamping plate; 12. Enclosure plate; 13. Upper clamping plate; 21. First limiting component; 22. Second limiting component; 31. Positioning seat; 32. Sensing seat; 33. Proximity switch; 34. Support seat; 4. Rivet clamping cylinder; 5. Workpiece clamping cylinder; 61. Floating support; 62. Floating support cylinder; 63. Movable support block; 64. Positioning pin; 65. First support rod; 66. Second support rod; 71. Internal air blowing device; 72. External air blowing device; 81. Detection cylinder; 82. Detection sensor; 83. Detection lens. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0034] like Figures 1-5 As shown, the present invention proposes a fixture structure for positioning a reference hole, which includes a lower fixture plate 11 and an upper fixture plate 13, with a cavity between the lower fixture plate 11 and the upper fixture plate 13, and the two are combined into a fixture table by a surrounding plate 12.

[0035] The limiting mechanism includes a first limiting member 21 located at the corner of the upper clamping plate 13, and a second limiting member 22 located at the remaining corners;

[0036] The positioning mechanism includes several positioning seats 31 disposed on the upper part of the upper clamping plate 13, a sensing seat 32 disposed on one side of the positioning seat 31, a proximity switch 33 mounted on the upper part of the sensing seat 32, and several support seats 34 disposed on the upper clamping plate 13.

[0037] The upper part of the support base 34 is a "spherical" structure, which is respectively set on one side of the first limiting member 21 and the second limiting member 22. The "spherical" structure on the upper part is directly attached to the rivet plate and the lower part of the workpiece for support.

[0038] The rivet clamping cylinder 4 for clamping the rivet plate is located in the middle of the upper clamping plate 13, and the workpiece clamping cylinder 5 for clamping the workpiece is located on the edge of the upper clamping plate 13.

[0039] The floating support mechanism includes a floating support 61, a floating support cylinder 62 is provided in the middle of the floating support 61, a movable support block 63 is provided at the output end of the floating support cylinder 62, and a positioning pin 64 is provided at the top of the movable support block 63.

[0040] The testing mechanism includes a testing cylinder 81 located on one side of the upper clamping plate 13. A movable testing sensor 82 is provided at the output end of the testing cylinder 81. A testing lens 83 is installed on the testing sensor 82 facing the table surface of the upper clamping plate 13.

[0041] It should be noted that: the first limiting member 21 has an "L-shaped" structure and is set in three sets; the second limiting member 22 has a "square" structure and is set in two sets symmetrically. The first limiting member 21 and the second limiting member 22 surround the outer periphery of the workpiece shell. The outer periphery of the rivet plate and the workpiece are pressed down against the inner cavity of the first limiting member 21 and the second limiting member 22 to limit the edges of the rivet plate and the workpiece. The first limiting member with the "L-shaped" structure provides coarse limiting of the irregular contours of the rivet plate and the workpiece through its corners. It works in conjunction with the second limiting member 22, which is symmetrically angled, to provide coarse limiting of the irregular contours of other positions, thus providing double limiting.

[0042] In this embodiment, when the edge contours of the rivet plate and the workpiece are coarsely limited and pressed down, the reference holes opened on the rivet plate and the workpiece cooperate with the support seat 34 to guide the pressing process. There are two sets of positioning seats 31, which are respectively set at the two ends of the diagonal of the clamping area of ​​the fixture table. Each positioning seat 31 cooperates with a sensing seat 32. The proximity switch 33 set in the "U-shaped" clamping groove of the sensing seat 32 is at the same height as the positioning seat 31. During the pressing process, the free reference hole cooperates with the protrusion on the positioning seat 31, and the side is attached to the proximity switch 33 when it is close to the sensing seat 32. When the two proximity switches 33 are pressed down at the same time, it indicates that the rivet plate and the workpiece have been initially laid flat, which drives the rivet plate clamping cylinder 4 and the workpiece clamping cylinder 5 to work and perform double pressing and fixing of the rivet plate and the workpiece.

[0043] At this time, the floating support mechanism adjusts the support spacing under the pressure generated by the rivet plate. Through the contraction or extension of the first support rod 65 and the second support rod 66, the two support rods directly contact the rivet plate to provide stable support in the irregular area.

[0044] Through the cooperation between the various structures, the rivet plate and the workpiece are stably clamped on the fixture table. They are supported on the outer periphery by the support seat 34 and internally by the floating support mechanism, ensuring that the rivet plate and the workpiece will not be damaged under pressure during the riveting process, and ensuring the stable progress of subsequent riveting.

[0045] It should be added that, as a detection example, the detection sensor 82 is controlled by the piston rod at the output end of the detection cylinder 81 to make a linear displacement, and the displacement direction of the fixture table composed of the lower fixture plate 11 and the upper fixture plate 13 forms a cross with the displacement direction of the detection sensor 82.

[0046] During the waiting period after clamping, the displacement of the fixture table in the front-to-back direction is used to simultaneously drive the detection sensor 82 to move in the left-to-right direction along the piston rod by the detection cylinder 81. During the displacement process, the detection sensor 82 performs secondary detection on the upper layer to determine whether the rivet plate and the upper part of the workpiece are in a horizontal state.

[0047] It is understandable that the splash guard is placed on top of the workpiece to prevent splashed waste from damaging the surface of the workpiece. At this time, the detection sensor 82 can detect whether the splash guard has been missed. When misplacement or instability occurs, an alarm can be triggered.

[0048] The rivet clamping cylinder 4 includes a rivet cylinder that penetrates the clamping cavity of the fixture table. The output end of the rivet cylinder is provided with a connecting rod assembly, and the other end of the connecting rod assembly is connected to a rivet pressure head that moves accordingly.

[0049] As an example of rivet clamping: The rivet cylinder drives the connecting rod assembly to move, causing the rivet pressure head to press down and clamp and fix the edge of the rivet.

[0050] The workpiece clamping cylinder 5 includes a workpiece cylinder that penetrates the clamping cavity of the fixture table. A connecting rod assembly is provided at the output end of the workpiece cylinder, and the other end of the connecting rod assembly is connected to a workpiece pressure head that moves accordingly.

[0051] As an example of workpiece clamping: the workpiece is attached to the upper part of the rivet plate. After the rivet plate is fixed, the workpiece clamping cylinder drives the linkage group in the empty space to drive the workpiece pressure head to press down and fix the workpiece above the rivet plate.

[0052] like Figures 1-2 As shown, the upper part of the first support rod 65 is a conical structure and the lower part is a square structure. The movable support block 63 and the lower part of the first support rod 65 are staggered. The side wall of the float cylinder 62 is provided with a movable positioning pin 64. One end of the positioning pin 64 that penetrates into the inner cavity of the float cylinder 62 is attached to the movable support block 63.

[0053] Among them, the movable support block 63 can move up and down along the inner cavity of the floating support cylinder 62. When subjected to the downward pressure of the rivet plate and the workpiece, it can retract or extend to provide auxiliary support for the rivet plate and the workpiece in the middle. After retraction or extension, it is limited by the positioning pin 64.

[0054] The floating support 61 is partially disposed on the upper layer of the upper clamping plate 13, and the remaining part is disposed in the clamping table cavity. The output end of the floating support 61 in the clamping table cavity is provided with a second support rod 66 that penetrates the upper part of the upper clamping plate 13. The length of the second support rod 66 is higher than that of the first support rod 65.

[0055] Understandably, the floating support part of the second support rod 66 is a hidden design. Because of the reserved through hole, it cooperates with the movable second support rod 66 for auxiliary support. Its structure is the same as that of the first support rod 65. The difference is that its movement path is longer when it extends and retracts, which can adapt to irregular rivet plates and workpiece support.

[0056] It should be noted that when the rivet plate and the workpiece are not placed stably, the first support rod 65 and the second support rod 66 are always in their initial state, which can prevent the rivet plate and the workpiece from being incorrectly clamped.

[0057] like Figure 1 As shown, the purging mechanism includes an internal air blowing device 71 and an external air blowing device 72. The internal air blowing device 71 is disposed on the upper layer of the upper clamping plate 13, and air holes are provided at its lower part. A guide plate is clamped between the air holes. The external air blowing device 72 is disposed on one side of the upper clamping plate 13, and the air outlet of the external air blowing device 72 faces the upper clamping plate 13.

[0058] It is understandable that during the riveting process, there is flying waste material above the fixture table, and a large amount of smoke is generated at the same time;

[0059] The internal air blowing device blows air upward through the air holes at the bottom, and the gas guide plate guides the gas to cool the riveting joint and exhaust the waste gas in the cavity below the riveting plate and the workpiece.

[0060] The external air blowing device 72 supplies air through the air outlet to blow away air, thereby cooling the riveting joint above the rivet plate and the workpiece and discharging the exhaust gas.

[0061] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A fixture structure for positioning a reference hole, characterized in that, It includes a lower clamping plate (11) and an upper clamping plate (13), with a cavity between the lower clamping plate (11) and the upper clamping plate (13), and the two are combined into a clamping table by a surrounding plate (12); The limiting mechanism includes a first limiting member (21) located at the corner of the upper clamp plate (13), and a second limiting member (22) located at the remaining corners. The positioning mechanism includes several positioning seats (31) disposed on the upper part of the upper clamping plate (13), a sensing seat (32) is disposed on one side of the positioning seat (31), a proximity switch (33) is installed on the upper part of the sensing seat (32), and several support seats (34) are also disposed on the upper clamping plate (13). The rivet clamping cylinder (4) for clamping the rivet plate is located in the middle of the upper clamping plate (13), and the workpiece clamping cylinder (5) for clamping the workpiece is located at the edge of the upper clamping plate (13). The floating support mechanism includes a floating support (61), a floating cylinder (62) is provided in the middle of the floating support (61), a movable support block (63) is provided at the output end of the floating cylinder (62), a positioning pin (64) is provided at the top of the movable support block (63), the upper part of the first support rod (65) is conical and the lower part is square. The lower parts of the movable support block (63) and the first support rod (65) are offset. The side wall of the floating cylinder (62) is provided with a movable positioning pin (64). One end of the positioning pin (64) that penetrates into the inner cavity of the floating cylinder (62) is attached to the movable support block (63). The testing mechanism includes a testing cylinder (81) disposed on one side of the upper clamping plate (13). The output end of the testing cylinder (81) is provided with a movable testing sensor (82). The testing sensor (82) is equipped with a testing lens (83) facing the table surface of the upper clamping plate (13).

2. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The detection sensor (82) is controlled by the piston rod at the output end of the detection cylinder (81) to make linear displacement. The displacement direction of the fixture table composed of the lower fixture plate (11) and the upper fixture plate (13) is cross-shaped with the displacement direction of the detection sensor (82).

3. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The first limiting member (21) has an "L-shaped" structure and is set in three groups. The second limiting member (22) has a "square" structure and is set in two groups symmetrically. The first limiting member (21) and the second limiting member (22) surround the outer periphery of the workpiece shell.

4. The fixture structure for positioning a reference hole according to claim 1, characterized in that, Two sets of positioning seats (31) are provided, located at the two ends of the diagonal of the clamping area of ​​the fixture table. Each positioning seat (31) is paired with a sensing seat (32). The proximity switch (33) provided in the "U-shaped" groove of the sensing seat (32) is at the same height as the positioning seat (31).

5. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The upper part of the support base (34) has a "spherical" structure and is respectively set on one side of the first limiting member (21) and the second limiting member (22).

6. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The rivet clamping cylinder (4) includes a rivet cylinder that penetrates the clamping cavity of the fixture table. A connecting rod assembly is provided at the output end of the rivet cylinder, and the other end of the connecting rod assembly is connected to a rivet pressure head that moves accordingly.

7. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The workpiece clamping cylinder (5) includes a workpiece cylinder that penetrates the clamping cavity of the fixture table. A connecting rod assembly is provided at the output end of the workpiece cylinder, and the other end of the connecting rod assembly is connected to a workpiece pressure head that moves accordingly.

8. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The floating support (61) is partially disposed on the upper layer of the upper clamping plate (13), and the remaining part is disposed in the clamping table cavity. The output end of the floating support (61) in the clamping table cavity is provided with a second support rod (66) that penetrates the upper part of the upper clamping plate (13). The length of the second support rod (66) is higher than that of the first support rod (65).

9. The fixture structure for positioning a reference hole according to claim 1, characterized in that, The purging mechanism includes an internal air blowing device (71) and an external air blowing device (72). The internal air blowing device (71) is located on the upper layer of the upper clamping plate (13) and has air holes at its lower part. A guide plate is clamped between the air holes. The external air blowing device (72) is located on one side of the upper clamping plate (13) and the air outlet of the external air blowing device (72) faces the upper clamping plate (13).

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