A positioning tool

Abstract

This invention proposes a positioning fixture, comprising a clamping block, a guide block, a limiting plate, and a pressure plate. The limiting plate and the guide block are respectively located at both ends of the clamping block. The clamping block is used to place the workpiece, the guide block is adapted to push the workpiece so that its end abuts against the limiting plate, and the pressure plate is located above the clamping block and is used to press down on the workpiece. This invention enables the clamping block to place the workpiece, the guide block to push the workpiece to move it so that its end abuts against the limiting plate, thereby achieving workpiece positioning; and the pressure plate pressing down on the workpiece enables workpiece clamping. This invention can achieve both positioning and clamping functions, has a simple structure, is easy to operate, and meets production needs.

Description

Technical Field

[0001] This utility model relates to the field of multi-station positioning and clamping technology, and in particular to a positioning fixture. Background Technology

[0002] Workpieces or objects that require positioning and clamping in multiple workstations are generally positioned manually using tools and instruments in sequence, and then clamped and fixed manually using tools and instruments in sequence. Manual operation is inefficient, prone to errors, and the clamping force is difficult to control, which may damage or fail to clamp the workpiece tightly. Utility Model Content

[0003] The purpose of this utility model is to provide a positioning tooling to at least partially solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A positioning fixture includes a clamping block, a guide block, a limiting plate, and a pressure plate. The limiting plate and the guide block are respectively disposed at both ends of the clamping block. The clamping block is used to place a workpiece. The guide block is adapted to push the workpiece so that the end of the workpiece abuts against the limiting plate. The pressure plate is disposed above the clamping block and is used to press down on the workpiece.

[0006] Optionally, the guide block includes a main body and a micro-movement part. The main body has a vertical guide groove on its side near the clamping block. The micro-movement part has a protrusion on its side corresponding to the guide groove. The protrusion extends into the guide groove and can move vertically along the guide groove. The upper surfaces of the main body and the micro-movement part are respectively provided with a first groove and a second groove for accommodating the workpiece.

[0007] Optionally, the main body is provided with a mounting platform on the side near the clamping block, the micro-motion part is provided on the mounting platform, and a first elastic element is provided between the micro-motion part and the mounting platform.

[0008] Optionally, the mounting platform is provided with a first positioning post, and the bottom surface of the micro-movement part is provided with a positioning hole corresponding to the first positioning post, with the first positioning post disposed in the positioning hole.

[0009] Optionally, it also includes a guide plate, the guide block having a through hole corresponding to the guide plate, one end of the guide plate passing through the through hole, the other end of the guide plate being connected to the clamping block, and the guide block being able to move on the guide plate.

[0010] Optionally, it also includes a first cylinder, the piston of which is connected to the guide block, and the first cylinder is used to drive the guide block to move.

[0011] Optionally, the limiting plate has a guide portion on the side near the clamping block. The guide portion includes a first guide boss, a second guide boss, a third guide boss, and a fourth guide boss. The second guide boss is provided corresponding to the notch of the workpiece. The third guide boss and the fourth guide boss are symmetrically provided on both sides of the second guide boss. The first guide boss is provided between the third guide boss and the fourth guide boss. The inner surfaces of the third guide boss and the fourth guide boss are in contact with the outer surface of the workpiece. The outer surface of the first guide boss is in contact with the inner surface of the boss of the workpiece.

[0012] Optionally, it also includes a second cylinder, which is located below the clamping block. The piston of the second cylinder is connected to one end of a connecting rod, and the other end of the connecting rod passes through the clamping block and is connected to the pressure plate.

[0013] Optionally, the connecting rod is provided with a second elastic element, which is located between the pressure plate and the clamping block.

[0014] Optionally, it further includes a base, a support plate, and a support column. The support plate includes a horizontal plate, an inclined plate, and a vertical plate. The horizontal plate and the vertical plate are respectively connected to both sides of the inclined plate. The support column is disposed on the base. The vertical plate is connected to the base. The horizontal plate is connected to the support column. The clamping block is disposed on the inclined plate. The guide block is located on the side of the clamping block closer to the horizontal plate. The limiting plate is located on the side of the clamping block away from the horizontal plate.

[0015] The beneficial effects of this utility model are as follows: This utility model can place the workpiece through the clamping block, and can push the workpiece to move so that the end of the workpiece abuts against the limiting plate, thereby realizing the positioning of the workpiece; the pressure plate presses down on the top of the workpiece to realize the clamping of the workpiece. This application can realize the two functions of positioning and clamping, with a simple structure, convenient operation, and meeting production needs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the positioning tooling according to an embodiment of the present invention;

[0018] Figure 2 This is a top view of a positioning fixture according to an embodiment of the present invention;

[0019] Figure 3 This is a left view of a positioning fixture according to an embodiment of the present invention;

[0020] Figure 4 This is a right view of a positioning fixture according to an embodiment of the present invention;

[0021] Figure 5 This is a diagram showing the usage state of a positioning tool according to an embodiment of the present invention;

[0022] Figure 6 This is an exploded view of a positioning tool according to an embodiment of the present invention;

[0023] Figure 7 This is an exploded view of a guide block according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the positioning tooling in the disassembled state of the limiting plate and clamping block according to an embodiment of the present invention;

[0025] Figure 9 for Figure 8 A magnified view of a portion of point A in the middle.

[0026] in:

[0027] 01. Workpiece; 1. Clamping block; 101. Clamping groove; 102. Locking screw; 2. Guide block; 21. Main body; 211. Guide groove; 212. Mounting platform; 213. First positioning post; 214. First groove; 215. Through hole; 22. Micro-motion part; 221. Protrusion; 222. Second groove; 23. First elastic element; 3. Limiting plate; 31. First guide boss; 311. First oblique arc surface; 312. First straight wall arc surface; 32. Second guide boss; 321. Side arc surface; 33. 34. Third guide boss; 35. Fourth guide boss; 36. Second oblique arc surface; 37. Second straight wall arc surface; 4. Pressure plate; 5. Guide plate; 6. First cylinder; 7. First air pipe fitting; 8. First reversing valve; 9. External air pipe interface; 10. Second cylinder; 11. Connecting rod; 12. Second air pipe fitting; 13. Second reversing valve; 14. Second elastic element; 15. Base; 16. Support plate; 17. Support column; 18. Pad; 19. Second positioning column; 20. Third positioning column; 21. Fourth positioning column. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In this embodiment, the workpiece is an intramedullary nail, which includes a shaft and a port. The middle portion of the shaft has a tapered cylindrical structure to accommodate the diameter variation of the shaft. The port has a ring of protrusions extending outward along the axial direction at its edge, and this end also has a notch. To position and clamp the workpiece, this embodiment provides a positioning fixture, such as... Figures 1-9 As shown, it includes a clamping block 1, a guide block 2, a limiting plate 3, and a pressure plate 4. The limiting plate 3 and the guide block 2 are respectively located at both ends of the clamping block 1. The clamping block 1 is used to place the workpiece 01. The guide block 2 is adapted to push the workpiece 01 so that the end of the workpiece 01 abuts against the limiting plate 3. The pressure plate 4 is located above the clamping block 1 and is used to press down on the workpiece 01.

[0030] In this embodiment, the workpiece 01 can be placed by the clamping block 1, and the workpiece 01 can be moved by the guide block 2 so that the end of the workpiece 01 abuts against the limiting plate 3, thereby achieving the positioning of the workpiece 01; the pressure plate 4 presses down on the top of the workpiece 01, thereby achieving the clamping of the workpiece 01. This embodiment can achieve both positioning and clamping functions, with a simple structure, convenient operation, and meets production needs.

[0031] Specifically, such as Figure 7 As shown, the guide block 2 includes a main body 21 and a micro-motion part 22. The main body 21 has a vertical guide groove 211 on its side near the clamping block 1. The micro-motion part 22 has a protrusion 221 on its side corresponding to the guide groove 211. The protrusion 221 extends into the guide groove 211 and can move vertically along the guide groove 211. The vertical length of the guide groove 211 is greater than the vertical length of the protrusion 221. The upper surfaces of the main body 21 and the micro-motion part 22 are respectively provided with a first groove 214 and a second groove 222 for accommodating the workpiece 01. The micro-motion part 22 can move slightly up and down relative to the main body 21. In this embodiment, both the first groove 214 and the second groove 222 are U-shaped grooves. The first groove 214 is used to support the workpiece 01, and the second groove 222 is used to hold the workpiece 01 at its diameter-changing position, i.e., the position of the conical columnar structure. This guide block 2 can position workpieces 01 of various specifications by moving the micro-motion part 22. When the diameter of the workpiece 01 at the second groove 222 of the micro-motion part 22 increases, the protrusion 221 of the micro-motion part 22 moves down along the guide groove 211 to adapt to the size change of the workpiece 01.

[0032] Furthermore, such as Figure 7As shown, the main body 21 has a mounting platform 212 on its side near the clamping block 1, and a micro-motion part 22 is provided on the mounting platform 212. A first elastic element 24 is provided between the micro-motion part 22 and the mounting platform 212. In this embodiment, the first elastic element 24 is a spring, which ensures that workpieces 01 of different specifications can contact the micro-motion part 22 each time.

[0033] Optionally, such as Figure 7 As shown, the mounting platform 212 is provided with a first positioning post 213, and the bottom surface of the micro-motion part 22 is provided with a positioning hole corresponding to the first positioning post 213, with the first positioning post 213 located in the positioning hole. The cooperation between the first positioning post 213 and the positioning hole can ensure the positional accuracy of the micro-motion part 22 during installation.

[0034] Optionally, such as Figure 1 , Figure 6 and Figure 7 As shown, the positioning fixture in this embodiment also includes a guide plate 5. The guide block 2 has a through hole 215 corresponding to the guide plate 5. One end of the guide plate 5 passes through the through hole 215, and the other end of the guide plate 5 is connected to the clamping block 1. The guide block 2 can move on the guide plate 5. The guide plate 5 guides the movement of the guide block 2, which is beneficial to the stability of the movement of the guide block 2 and thus can stably push the workpiece 01.

[0035] Specifically, such as Figure 1 and Figure 6 As shown, the positioning fixture in this embodiment also includes a first cylinder 6. The piston of the first cylinder 6 is connected to the guide block 2, and the first cylinder 6 is used to drive the guide block 2 to move. In this embodiment, the first cylinder 6 is mounted on the end face of the guide plate 5 that extends out of the guide block 2. The first cylinder 6 is connected to the first reversing valve 8 through the first air pipe fitting 7, and the first reversing valve 8 is connected to the external air pipe interface 9. The first cylinder 6, the first air pipe fitting 7, the first reversing valve 8, and the external air pipe interface 9 are all existing structures. In addition, in other embodiments, the first cylinder 6 that drives the guide block 2 to move can also be replaced by an electric push rod, a hydraulic cylinder, a linear module, or other mechanisms that can drive the guide block 2 to move.

[0036] Optionally, such as Figure 5 As shown, in this embodiment, the lower part of the clamping block 1 is provided with a mounting hole for mounting the guide plate 5. One end of the guide plate 5 extends into the mounting hole, and the clamping block 1 and the guide plate 5 are locked by locking screws 102. The mounting position of the guide plate 5 can be adjusted by locking screws 102, thereby adjusting the position of the first cylinder 6 and the guide block 2.

[0037] Furthermore, such as Figure 5 , Figure 6 , Figure 8 and Figure 9As shown, the limiting plate 3 has a guide portion on the side near the clamping block 1. The guide portion includes a first guide boss 31, a second guide boss 32, a third guide boss 33, and a fourth guide boss 34. The second guide boss 32 is provided corresponding to the notch at the end of the workpiece 01. The third guide boss 33 and the fourth guide boss 34 are symmetrically provided on both sides of the second guide boss 32. The first guide boss 31 is provided between the third guide boss 33 and the fourth guide boss 34. The inner surfaces of the third guide boss 33 and the fourth guide boss 34 are in contact with the outer surface of the workpiece 01. The outer surface of the first guide boss 31 is in contact with the inner surface of the end of the workpiece 01. Specifically, in this embodiment, both the inner and outer surfaces of the first guide boss 31 are arc-shaped. The outer surface of the first guide boss 31 includes a first inclined arc surface 311 and a first straight wall arc surface 312. The first straight wall arc surface 312 is connected to the limiting plate 3, and the first inclined arc surface 311 is connected to the first straight wall arc surface 312. The first inclined arc surface 311 gradually slopes inward in a direction away from the first straight wall arc surface 312. The first inclined arc surface 311 facilitates the entry of the first guide boss 31 into the workpiece. Inside the port portion of workpiece 01, the first straight wall arc surface 312 is used to fit against the inner side surface of the port portion of workpiece 01; the second guide boss 32 is set corresponding to the notch of workpiece 01, and the top edges of the two sides of the second guide boss 32 are provided with side arc surfaces 321, which is similar to rounding the top edges of the side surfaces, for guiding workpiece 01 and facilitating the insertion of workpiece 01. The two sides of the second guide boss 32 fit against the two sides of the notch of workpiece 01, and the second guide boss 32 is inserted into the notch of workpiece 01 for limiting. The third guide boss 33 and the fourth guide boss 34 have the same shape. Their inner surfaces include a second oblique arc surface 341 and a second straight wall arc surface 342. The second straight wall arc surface 342 is connected to the limiting plate 3. The second oblique arc surface 341 is connected to the second straight wall arc surface 342. The second oblique arc surface 341 gradually tilts outward in a direction away from the second straight wall arc surface 342. The height of the second oblique arc surface 341 is greater than the height of the first guide boss 31. Its function is that when the workpiece 01 is clamped, the second oblique arc surface 341 guides the workpiece 01 to the first oblique arc surface 311 of the first guide boss 31. The second oblique arc surface 341 guides again so that the outer surface of the workpiece 01 is in contact with the second straight wall arc surface 342. At the same time, under the guidance of the first oblique arc surface 311, the first straight wall arc surface 312 is in contact with the inner surface of the boss of the workpiece 01. In this embodiment, the limiting plate 3 is designed with a guide part that cooperates with the workpiece 01 for guiding the workpiece 01 during positioning.

[0038] Specifically, such as Figures 1-6As shown, the positioning fixture in this embodiment also includes a second cylinder 10, which is located below the clamping block 1. The piston of the second cylinder 10 is connected to one end of the connecting rod 11, and the other end of the connecting rod 11 passes through the clamping block 1 and is connected to the pressure plate 4, for driving the pressure plate 4 to move. In this embodiment, the second cylinder 10 is connected to the second reversing valve 13 through the second air pipe fitting 12, and the second reversing valve 13 is connected to the external air pipe interface 9. The second cylinder 10, the second air pipe fitting 12, the second reversing valve 13, and the external air pipe interface 9 are all existing structures. In addition, in other embodiments, the second cylinder 10 that drives the pressure plate 4 to move can also be replaced by an electric push rod, a hydraulic cylinder, a linear module, or other mechanisms that can drive the pressure plate 4 to move.

[0039] Optionally, such as Figure 5 As shown, a second elastic element 14 is provided on the connecting rod 11, and the second elastic element 14 is located between the pressure plate 4 and the clamping block 1. In this embodiment, the second elastic element 14 is a spring.

[0040] Furthermore, such as Figure 1 and Figure 6 As shown, the positioning fixture in this embodiment also includes a base 15, a support plate 16, and a support column 17. The support plate 16 includes a horizontal plate, an inclined plate, and a vertical plate. The horizontal plate and the vertical plate are respectively connected to both sides of the inclined plate. The support column 17 is disposed on the base 15, the vertical plate is connected to the base 15, and the horizontal plate is connected to the support column 17. The clamping block 1 is disposed on the inclined plate, the guide block 2 is located on the side of the clamping block 1 closer to the horizontal plate, and the limiting plate 3 is located on the side of the clamping block 1 away from the horizontal plate. The inclined plate of the support plate 16 causes the clamping block 1 to be installed at an angle, causing the workpiece 01 on the clamping block 1 to be tilted, so that the side of the workpiece 01 that contacts the guide block 2 is higher, and the side that abuts against the limiting plate 3 is lower, which is beneficial for the positioning of the workpiece 01. Figure 3 and Figure 4 As shown, in order to ensure stability during use, a support column 17 is used to reinforce the base 15 and the support plate 16 in this embodiment.

[0041] Optionally, such as Figure 2 As shown, in order to satisfy the cylindrical workpiece 01, the clamping groove 101 provided on the clamping block 1 is designed in a "V" shape.

[0042] In this embodiment, as Figure 6 As shown, the second cylinder 10 is mounted on the base 15. Since the clamping block 1 is installed at an angle, the pressure plate 4 is set parallel to the clamping block 1. In order to ensure that the second cylinder 10 is connected to the pressure plate 4, a pad 18 is provided on the base 15. The surface of the pad 18 used to install the second cylinder 10 is inclined.

[0043] Optionally, such as Figure 6As shown, to ensure the positioning accuracy between tooling parts, the base 15 is positioned with the support plate 16 and the pad 18 respectively by the second positioning post 19; the support plate 16 is positioned with the clamping block 1 and the limiting plate 3 respectively by the third positioning post 20; and the clamping block 1 and the limiting plate 3 are positioned with the fourth positioning post 21. Disassembly and reassembly of the tooling ensures the accuracy between the various components. The components can be installed together using screws.

[0044] The working process of this embodiment:

[0045] Positioning process: Place workpiece 01 in the clamping slot 101 of clamping block 1, and use the first reversing valve 8 to control air to enter the first air pipe fitting 7 and reach the first cylinder 6. The piston of the first cylinder 6 pushes the guide block 2 to lock the workpiece 01 and continue to move until the workpiece 01 is pressed against the limit plate 3.

[0046] Clamping process: The second reversing valve 13 controls the air to enter the second air pipe fitting 12 and reach the second cylinder 10. The piston of the second cylinder 10 pulls down the connecting rod 11 and the pressure plate 4, and the pressure plate 4 presses down to clamp the workpiece 01.

[0047] The positioning process described above must be completed before the clamping process to ensure positioning accuracy. This multi-station semi-automatic positioning pneumatic fixture has a simple structure, is easy to operate, and has high clamping efficiency, meeting production requirements.

[0048] Disassembling workpiece 01: Control the first reversing valve 8 in the opposite direction to retract the guide block 2. At this time, the guide block 2 no longer presses against workpiece 01. Control the second reversing valve 13 in the opposite direction to raise the connecting rod 11. At this time, the second elastic element 14 automatically lifts the pressure plate 4. At this time, the pressure plate 4 no longer presses against workpiece 01, and workpiece 01 is released.

[0049] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In this utility model, 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," "on top of," and "over" 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] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning fixture, characterized in that: It includes a clamping block, a guide block, a limiting plate, and a pressure plate. The limiting plate and the guide block are respectively disposed at both ends of the clamping block. The clamping block is used to place the workpiece. The guide block is adapted to push the workpiece so that the end of the workpiece abuts against the limiting plate. The pressure plate is disposed above the clamping block and is used to press down on the workpiece.

2. The positioning fixture according to claim 1, characterized in that: The guide block includes a main body and a micro-movement part. The main body has a vertical guide groove on its side near the clamping block. The micro-movement part has a protrusion on its side corresponding to the guide groove. The protrusion extends into the guide groove and can move vertically along the guide groove. The upper surfaces of the main body and the micro-movement part are respectively provided with a first groove and a second groove for accommodating the workpiece.

3. The positioning fixture according to claim 2, characterized in that: The main body is provided with a mounting platform on the side near the clamping block, the micro-motion part is provided on the mounting platform, and a first elastic element is provided between the micro-motion part and the mounting platform.

4. The positioning fixture according to claim 3, characterized in that: The installation platform is provided with a first positioning post, and the bottom surface of the micro-movement part is provided with a positioning hole corresponding to the first positioning post, with the first positioning post located in the positioning hole.

5. The positioning fixture according to claim 1, characterized in that: It also includes a guide plate, and the guide block has a through hole corresponding to the guide plate. One end of the guide plate passes through the through hole, and the other end of the guide plate is connected to the clamping block. The guide block can move on the guide plate.

6. The positioning fixture according to claim 1, characterized in that: It also includes a first cylinder, the piston of which is connected to the guide block, and the first cylinder is used to drive the guide block to move.

7. The positioning fixture according to claim 1, characterized in that: The limiting plate has a guide portion on its side near the clamping block. The guide portion includes a first guide boss, a second guide boss, a third guide boss, and a fourth guide boss. The second guide boss is provided corresponding to the notch of the workpiece. The third guide boss and the fourth guide boss are symmetrically provided on both sides of the second guide boss. The first guide boss is provided between the third guide boss and the fourth guide boss. The inner surfaces of the third guide boss and the fourth guide boss are in contact with the outer surface of the workpiece. The outer surface of the first guide boss is in contact with the inner surface of the boss of the workpiece.

8. The positioning fixture according to claim 1, characterized in that: It also includes a second cylinder, which is located below the clamping block. The piston of the second cylinder is connected to one end of a connecting rod, and the other end of the connecting rod passes through the clamping block and is connected to the pressure plate.

9. The positioning fixture according to claim 8, characterized in that: The connecting rod is provided with a second elastic element, which is located between the pressure plate and the clamping block.

10. The positioning fixture according to claim 1, characterized in that: It also includes a base, a support plate, and a support column. The support plate includes a horizontal plate, an inclined plate, and a vertical plate. The horizontal plate and the vertical plate are respectively connected to both sides of the inclined plate. The support column is disposed on the base. The vertical plate is connected to the base. The horizontal plate is connected to the support column. The clamping block is disposed on the inclined plate. The guide block is located on the side of the clamping block closer to the horizontal plate. The limiting plate is located on the side of the clamping block away from the horizontal plate.

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