Telescopic positioning pin device

Abstract

The utility model discloses a telescopic positioning pin device, which relates to the technical field of positioning element design, is used for being mounted on a clamp body to position a workpiece, and comprises an air cylinder, a guide assembly and a positioning assembly, the air cylinder is fixedly mounted on one side of the clamp body, and a piston rod of the air cylinder penetrates through the clamp body; the guide assembly comprises a fixed connecting base and a positioning guide shaft, the fixed connecting base is installed on the side, away from the air cylinder, of the clamp body, the positioning guide shaft is movably arranged in the fixed connecting base in a penetrating mode, and the positioning guide shaft is connected with the end of the piston rod through a connecting assembly; and the positioning assembly comprises a supporting block and a positioning pin, the supporting block is fixedly installed on the side, away from the connecting assembly, of the fixed connecting base, and the positioning pin is arranged in the supporting block in a penetrating mode and connected with the positioning guide shaft. Through the arrangement, the use convenience of the telescopic positioning pin device and the replacement convenience of internal parts of the telescopic positioning pin device can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning element design, in particular to a retractable positioning pin device. Background Art

[0002] Locating pins are widely used in mechanical equipment and automated assembly lines. There are many types of locating pins, including fixed locating pins, replaceable locating pins, conical locating pins, chamfered locating pins, standard diamond locating pins, spring locating pins, etc. Their function is to limit the free movement of parts and objects. Users often choose different locating pins according to the actual conditions of the parts, such as according to the occasions, requirements and performance, to reasonably choose locating pins of different shapes and performances. At present, users usually use a combination of cylindrical pins and chamfered locating pins for telescopic positioning in the automatic line accompanying tooling and automatic gripping gripper positioning methods. The fixture is an important process equipment in mechanical manufacturing. The locating pin is a positioning element often used when the inner hole of the workpiece being processed is used as the positioning reference.

[0003] Therefore, how to provide a telescopic positioning pin that is easy to use and replace is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0004] The utility model aims to provide a telescopic positioning pin which is convenient to use and replace.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A retractable positioning pin device, used for being installed on a fixture body to position a workpiece, comprises:

[0007] The cylinder is fixedly mounted on one side of the fixture body, and the piston rod of the cylinder is passed through the fixture body;

[0008] The guide assembly includes a fixed connection seat and a positioning guide shaft, wherein the fixed connection seat is installed on the side of the fixture body away from the cylinder, and the positioning guide shaft is movably arranged inside the fixed connection seat, and the positioning guide shaft is connected to the end of the piston rod through the connection assembly;

[0009] The positioning assembly comprises a support block and a positioning pin. The support block is fixedly mounted on a side of the fixed connection seat away from the connection assembly. The positioning pin is passed through the interior of the support block and connected to the positioning guide shaft.

[0010] Preferably, the fixed connection seat is connected to the fixture body through a transition connection plate.

[0011] Preferably, an oil-free bushing is provided between the positioning guide shaft and the fixed connection seat.

[0012] Preferably, a countersunk hole for installing a positioning pin is provided at the end of the positioning guide shaft facing away from the cylinder.

[0013] Preferably, a through hole perpendicular to the axis of the positioning guide shaft is provided on the circumferential surface thereof, and the through hole is used for installing a top screw to abut against the positioning pin to prevent the positioning pin from falling off.

[0014] Preferably, the locating pin has an overall columnar structure, and an annular cone is provided on the circumferential surface of the locating pin, which is used to abut the top of the locating guide shaft. An annular groove is also provided on the circumferential surface of the locating pin for engaging with the top screw, and the inner diameter of the annular groove gradually decreases in the direction approaching the annular cone.

[0015] Preferably, the connection assembly comprises:

[0016] The front end hinge joint of the cylinder is used to connect the piston rod and the positioning guide shaft. The front end hinge joint of the cylinder is connected to the piston rod through a thread. The front end hinge joint of the cylinder is detachably connected to the positioning guide shaft through a standard cotter pin. A connecting shaft hinge is provided at the end of the standard cotter pin to prevent the standard cotter pin from falling off.

[0017] Preferably, the positioning pin is made of Cr12MoV and is quenched.

[0018] Preferably, the positioning guide shaft is made of carbon structural steel, and there is a clearance fit between the positioning guide shaft and the oil-free bushing.

[0019] Preferably, the cylinder is a thin cylinder.

[0020] Compared with the above-mentioned background technology, the utility model provides a retractable positioning pin device, which is used to be installed on a fixture body to position a workpiece, and the retractable positioning pin device includes: a cylinder, a guide assembly and a positioning assembly; the cylinder is fixedly installed on one side of the fixture body, and the piston rod of the cylinder is passed through the fixture body; the guide assembly includes a fixed connecting seat and a positioning guide shaft, the fixed connecting seat is installed on the side of the fixture body away from the cylinder, the positioning guide shaft is movably passed through the fixed connecting seat, and the positioning guide shaft is connected to the end of the piston rod through the connecting assembly; the positioning assembly includes a support block and a positioning pin, the support block is fixedly installed on the side of the fixed connecting seat away from the connecting assembly, the positioning pin is passed through the support block and connected to the positioning guide shaft.

[0021] Specifically, the cylinder installed on the lower side of the clamp body is the power source for the extension and retraction of the device. A guide assembly and a positioning assembly are fixed in sequence on the other side of the clamp body. The fixed connecting seat of the guide assembly is fixedly installed on the upper side of the clamp body, and a positioning guide shaft is movably penetrated inside the fixed connecting seat. The positioning guide shaft is connected to the piston rod of the cylinder through a connecting assembly, and a positioning pin in the positioning assembly is installed on the other end of the positioning guide shaft. Under the action of the cylinder, the positioning pin can move up and down along its axis in the support seat, thereby realizing the extension and retraction of the positioning pin. With this arrangement, automatic positioning of the workpiece is realized by extending and retracting the positioning pin, which improves the convenience of workpiece processing. In addition, when the positioning pin or the positioning guide shaft is worn out due to long-term use, it can be replaced without replacing the entire device, thereby reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] FIG1 is a schematic diagram of the overall structure of a retractable positioning pin device provided in an embodiment of the utility model;

[0024] FIG2 is a front view of a retractable positioning pin device provided by an embodiment of the utility model;

[0025] FIG3 is a right side cross-sectional view of the retractable positioning pin device provided by an embodiment of the utility model;

[0026] FIG4 is a top view of a retractable positioning pin device provided in an embodiment of the utility model;

[0027] FIG. 5 is a schematic diagram of the positioning pin structure provided by an embodiment of the utility model.

[0028] in:

[0029] 001- fixture body;

[0030] 100-cylinder, 110-piston rod, 120-detection switch;

[0031] 200-guide assembly, 210-fixed connection seat, 211-transition connection plate, 220-positioning guide shaft, 221-counterbore, 222-through hole, 230-oil-free bushing;

[0032] 300-positioning assembly, 310-support block, 320-positioning pin, 321-annular frustum, 322-annular groove, 330-adjusting gasket;

[0033] 400-connecting assembly, 410-cylinder front end hinge joint, 420-standard cotter pin, 430-connecting shaft hinge. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0037] The utility model aims to provide a telescopic positioning pin which is convenient to use and replace.

[0038] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0039] Please refer to Figures 1 to 5. This embodiment provides a retractable positioning pin device, which is used to be installed on a fixture body 001 to position a workpiece. The retractable positioning pin device 320 includes: a cylinder 100, a guide assembly 200 and a positioning assembly 300; the cylinder 100 is fixedly installed on one side of the fixture body 001, and the piston rod 110 of the cylinder 100 is inserted into the fixture body 001; the guide assembly 200 includes a fixed connection seat 210 and a positioning guide shaft 220, and the fixed connection seat 2 10 is installed on the side of the clamp body 001 away from the cylinder 100, the positioning guide shaft 220 is movably inserted into the fixed connecting seat 210, and the positioning guide shaft 220 is connected to the end of the piston rod 110 through the connecting assembly 400; the positioning assembly 300 includes a support block 310 and a positioning pin 320, the support block 310 is fixedly installed on the side of the fixed connecting seat 210 away from the connecting assembly 400, the positioning pin 320 is inserted into the support block 310, and is connected to the positioning guide shaft 220.

[0040] Specifically, as shown in Figures 1 to 3, the cylinder 100 is installed on the lower side of the clamp body 001, and the end of the cylinder 100 close to the piston rod 110 is in contact with the clamp body 001. The piston rod 110 of the cylinder 100 passes through the hole in the middle of the clamp body 001, and the piston rod 110 can move up and down through the hole. An air inlet and an air outlet are provided on the side of the cylinder body of the cylinder 100; wherein, the cylinder 100 is installed on the lower side of the clamp body 001 by bolts, and when the cylinder 100 is damaged or unsuitable, it can be removed for replacement.

[0041] In this embodiment, a guide assembly 200 is provided in the direction of telescopic movement of the piston rod 110 of the cylinder 100, and a fixed connecting seat 210 of the guide assembly 200 is fixedly installed on the side of the clamp body 001 away from the cylinder 100, and a slidable positioning guide shaft 220 is provided inside it. It should be noted that the axis of the positioning guide shaft 220 and the piston rod 110 coincide, and the two are located and move on the same straight line, wherein the positioning guide shaft 220 is connected to the end of the piston rod 110 through the connecting assembly 400.

[0042] As shown in FIGS. 2 to 4 , a positioning pin 320 is installed on the top of the positioning guide shaft 220, and a support block 310 is provided outside the positioning pin 320. The support block 310 is installed on the top of the fixed connection seat 210 by bolts, and a through hole is provided at the position corresponding to the positioning pin 320 to accommodate the positioning pin 320. The positioning pin 320 can extend outward from the support block 310, or can be retracted into the inside of the support block 310. It should be noted that an adjustment gasket 330 is provided between the support block 310 and the fixed connection seat 210, and the height of the support block 310 can be changed by changing the thickness of the adjustment gasket 330 to adapt to positioning pins 320 of different lengths, so that the support block 310 does not need to be replaced when different positioning pins 320 are replaced.

[0043] That is to say, the cylinder 100 installed on the lower side of the clamp body 001 is the power source for the extension and retraction of the device. On the other side of the clamp body 001, the guide assembly 200 and the positioning assembly 300 are fixed in sequence. The fixed connecting seat 210 of the guide assembly 200 is fixedly installed on the upper side of the clamp body 001, and a positioning guide shaft 220 is movably penetrated inside the fixed connecting seat 210. The positioning guide shaft 220 is connected to the piston rod 110 of the cylinder 100 through the connecting assembly 400, and a positioning pin 320 in the positioning assembly 300 is installed at the other end of the positioning guide shaft 220. Under the action of the cylinder 100, the positioning pin 320 can move up and down along its axis in the support seat, thereby realizing the extension and retraction of the positioning pin 320. With such a configuration, the automatic positioning of the workpiece is realized by the extension and retraction of the positioning pin 320, which improves the convenience of workpiece processing. In addition, when the positioning pin 320 or the positioning guide shaft 220 is worn due to long-term use, it can be replaced without replacing the entire device, thereby reducing the cost of use.

[0044] Preferably, the fixed connection seat 210 is connected to the fixture body 001 through a transition connection plate 211 .

[0045] Specifically, as shown in Figures 1, 2 and 3, the fixed connecting seat 210 is installed on one side of the transition connecting plate 211, and the transition connecting plate 211 is fixedly installed on the side of the fixture body 001. The guide assembly 200 and the positioning assembly 300 are supported only by this transition connecting plate 211, which increases the space between the guide assembly 200 and the fixture body 001 and facilitates the installation of the guide assembly 200.

[0046] Preferably, an oil-free bushing 230 is provided between the positioning guide shaft 220 and the fixed connection seat 210 .

[0047] It can be understood that the positioning guide shaft 220, as a connecting piece between the piston rod 110 of the cylinder 100 and the positioning pin 320, will continuously move up and down, so there will be continuous friction between the positioning guide shaft 220 and the fixed connecting seat 210, which will reduce the service life of the positioning guide shaft 220 and the fixed connecting seat 210. Therefore, an oil-free bushing 230 is provided between the positioning guide shaft 220 and the fixed connecting seat 210. In this way, the positioning guide shaft 220 will move inside the oil-free bushing 230, so friction will occur between the oil-free bushing 230 and the positioning guide shaft 220; the oil-free bushing 230 is a standard part, generally made of copper, and has high wear resistance; if the positioning guide shaft 220 or the oil-free bushing 230 is severely worn in time, the oil-free bushing 230 and the positioning guide shaft 220 can be conveniently replaced without replacing the fixed connecting seat 210, thereby reducing the use cost of this embodiment.

[0048] Preferably, a countersunk hole 221 for mounting the positioning pin 320 is provided at the end of the positioning guide shaft 220 away from the cylinder 100 .

[0049] As shown in FIG. 3 , in this embodiment, a countersunk hole 221 is provided at the top of the positioning guide shaft 220, and a positioning pin 320 can be installed inside the countersunk hole 221. It should be noted that the center line of the countersunk hole 221 coincides with the axis of the positioning guide shaft 220. In this way, the positioning pin 320 and the positioning guide shaft 220 are arranged as a split structure to facilitate the replacement of damaged parts. For example, when the positioning guide shaft 220 or the positioning pin 320 is damaged, only the damaged part needs to be replaced without replacing the overall part. In addition, it is very convenient to use different types of positioning pins 320.

[0050] Preferably, a through hole 222 perpendicular to the axis of the positioning guide shaft 220 is provided on the circumferential surface thereof, and the through hole 222 is used for installing a top screw to abut against the positioning pin 320 to prevent the positioning pin 320 from falling off.

[0051] It can be understood that in order to reinforce the positioning pin 320 installed inside the positioning guide shaft 220, a through hole 222 perpendicular to its axis is provided on the circumference of the positioning guide shaft 220. It should be noted that the through hole 222 and the countersunk hole 221 intersect with each other. In this way, after the positioning pin 320 is installed, a top screw can be installed in the through hole 222 to prevent the positioning pin 320 from detaching from the guide positioning shaft.

[0052] Preferably, the positioning pin 320 has a columnar structure as a whole, and an annular cone 321 is provided on the circumferential surface of the positioning pin 320, which is used to abut the top of the positioning guide shaft 220. An annular groove 322 is also provided on the circumferential surface of the positioning pin 320 for clamping with the top screw, and the inner diameter of the annular groove 322 gradually decreases in the direction approaching the annular cone 321.

[0053] Specifically, as shown in Figure 5, the locating pin 320 is a columnar structure as a whole, and an annular cone 321 is provided on its circumferential surface. The annular cone 321 is used to support the locating pin 320 when the locating pin 320 is installed in the countersunk hole 221. It should be noted that the cylinder diameters above and below the annular cone 321 can be different and can be adjusted according to actual needs; in addition, an annular groove 322 is provided below the annular cone 321 of the locating pin 320, and the annular groove 322 just corresponds to the position of the top screw. In this way, the top screw can pass through the through hole 222 to act on the annular groove 322 to prevent the locating pin 320 from detaching from the positioning guide shaft 220.

[0054] Preferably, the connecting assembly 400 includes: a cylinder front end hinge joint 410, which is used to connect the piston rod 110 and the positioning guide shaft 220. The cylinder front end hinge joint 410 is connected to the piston rod 110 through a thread. The cylinder front end hinge joint 410 is detachably connected to the positioning guide shaft 220 through a standard cotter pin 420. A connecting shaft hinge 430 is provided at the end of the standard cotter pin 420 to prevent the standard cotter pin 420 from falling off.

[0055] Specifically, as shown in Figures 2 and 3, since the piston rod 110 and the guide positioning shaft are both columnar structures, it is not very convenient to connect the two. Therefore, this embodiment provides a cylinder front end hinge joint 410, the lower end of which is provided with a thread, which can be threadedly connected with the thread at the end of the piston rod 110, and the other end is hinged to the positioning guide shaft 220 through a standard cotter pin 420. In order to prevent the standard cotter pin 420 from detaching, resulting in the separation of the cylinder front end hinge joint 410 and the positioning guide shaft 220, a connecting shaft hinge 430 is provided at the end of the standard cotter pin 420; in this way, the piston rod 110 and the positioning guide shaft 220 are set to be detachably connected, which is convenient for their installation and replacement of parts.

[0056] Preferably, the positioning pin 320 is made of Cr12MoV and is quenched.

[0057] It can be understood that the positioning pin 320 needs to position the workpiece. Therefore, in this embodiment, the material of the positioning pin 320 is preferably Cr12MoV, and quenching treatment is performed to improve the surface hardness.

[0058] Preferably, the positioning guide shaft 220 is made of carbon structural steel, and there is a clearance fit between the positioning guide shaft 220 and the oil-free bushing 230 .

[0059] It is understandable that since the positioning guide shaft 220 is prone to greater wear, its material is selected to be relatively economical ordinary carbon structural steel. It should be noted that in order to maintain the accurate positioning of the positioning pin 320, the surface of the positioning guide shaft has very high requirements on dimensional accuracy and surface hardness, and the positioning guide shaft 220 and the oil-free bushing 230 are specifically a clearance fit.

[0060] Preferably, the cylinder 100 is a thin cylinder.

[0061] In this embodiment, the cylinder 100 is preferably a thin cylinder, and of course it can be adjusted according to actual conditions. No specific limitation is made here, as long as the above purpose can be achieved. In addition, a detection switch 120 is provided on the cylinder body of the cylinder 100, which can detect the state of the piston rod 110 inside it and send out information whether it is extended or retracted.

[0062] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] The above is a detailed introduction to the embodiments provided by the utility model. This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A retractable positioning pin device, used for being installed on a fixture body (001) to position a workpiece, characterized in that: include: A cylinder (100) is fixedly mounted on one side of the clamp body (001), and a piston rod (110) of the cylinder (100) is inserted through the clamp body (001); A guide assembly (200) comprising a fixed connection seat (210) and a positioning guide shaft (220), wherein the fixed connection seat (210) is mounted on a side of the clamp body (001) away from the cylinder (100), and the positioning guide shaft (220) is movably arranged inside the fixed connection seat (210), and the positioning guide shaft (220) is connected to the end of the piston rod (110) via a connection assembly (400); The positioning assembly (300) comprises a support block (310) and a positioning pin (320), wherein the support block (310) is fixedly mounted on a side of the fixed connection seat (210) facing away from the connection assembly (400), and the positioning pin (320) is inserted into the support block (310) and connected to the positioning guide shaft (220).

2. The retractable positioning pin device according to claim 1, characterized in that: The fixed connection seat (210) is connected to the clamp body (001) via a transition connection plate (211).

3. The retractable positioning pin device according to claim 2, characterized in that: An oil-free bushing (230) is provided between the positioning guide shaft (220) and the fixed connection seat (210).

4. The retractable positioning pin device according to claim 3, characterized in that: The end of the positioning guide shaft (220) facing away from the cylinder (100) is provided with a countersunk hole (221) for mounting the positioning pin (320).

5. The retractable positioning pin device according to claim 4, characterized in that: A through hole (222) perpendicular to the axis of the positioning guide shaft (220) is provided on the circumferential surface thereof, and the through hole (222) is used to install a top screw to abut against the positioning pin (320) to prevent the positioning pin (320) from falling off.

6. The retractable positioning pin device according to claim 5, characterized in that: The positioning pin (320) is of a columnar structure as a whole, and an annular truncated cone (321) is provided on the circumference of the positioning pin (320), and the truncated cone is used to abut against the top end of the positioning guide shaft (220). An annular groove (322) is also provided on the circumference of the positioning pin (320) for engaging with the top screw, and the inner diameter of the annular groove (322) gradually decreases in a direction approaching the annular truncated cone (321).

7. The retractable positioning pin device according to claim 1, characterized in that: The connection assembly (400) comprises: The front end hinge joint (410) of the cylinder is used to connect the piston rod (110) and the positioning guide shaft (220). The front end hinge joint (410) of the cylinder is connected to the piston rod (110) via a thread. The front end hinge joint (410) of the cylinder is detachably connected to the positioning guide shaft (220) via a standard cotter pin (420). The end of the standard cotter pin (420) is provided with a connecting shaft hinge (430) for preventing the standard cotter pin (420) from falling off.

8. The retractable positioning pin device according to claim 1, characterized in that: The positioning pin (320) is made of Cr12MoV and is quenched.

9. The retractable positioning pin device according to claim 3, characterized in that: The positioning guide shaft (220) is made of carbon structural steel, and there is a clearance fit between the positioning guide shaft (220) and the oil-free bushing (230).

10. The retractable positioning pin device according to claim 1, characterized in that: The cylinder (100) is specifically a thin cylinder.

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