Positioning clamp with air tightness detection function

Abstract

The utility model discloses a positioning clamp with an air tightness detection function, which comprises a rotatable chuck, the chuck is provided with a clamping end, the clamping end is provided with a plurality of clamping blocks, and the plurality of clamping blocks are close to each other or far away from each other to clamp or release a workpiece; the positioning block is arranged at the clamping end and located among the multiple clamping blocks, a plurality of detection air holes are formed in the positioning block, and the positioning block can be attached to or separated from a workpiece so as to seal or open the detection air holes. According to the utility model, gas is introduced into the detection air hole to judge whether the end face of the workpiece is attached to the positioning block, and the workpiece is continuously adjusted until the end face of the workpiece is completely attached to the positioning block, so that the workpiece can be axially and accurately positioned, the central axis of the workpiece is ensured to coincide with the rotating shaft, and the workpiece is prevented from jumping in the rotating process to crush the roller pin.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a positioning clamp with an airtightness detection function. Background Art

[0002] In the rolling process, the workpiece is clamped by a chuck and then driven to rotate to achieve the rolling process.

[0003] However, existing chucks (such as three-jaw chucks) clamp the workpiece by moving the jaws inwards to abut against the side of the workpiece. In other words, the current chuck can only achieve rough positioning by abutting the jaws against the side of the workpiece, and cannot accurately position the workpiece axially. The center axis of the workpiece and the rotation axis do not completely coincide, causing the workpiece to jump and hit the needle roller when rotating, eventually causing the needle roller to crack or even damage the workpiece. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a positioning fixture with an airtightness detection function, which is used to solve the problem that the fixture in the prior art cannot achieve accurate axial positioning, resulting in the workpiece jumping and hitting the needle roller.

[0005] The utility model solves the technical problem by adopting a technical solution that is a positioning fixture with an airtightness detection function, the positioning fixture comprises a rotatable chuck, the chuck has a clamping end, a plurality of clamping blocks are arranged on the clamping end, the plurality of clamping blocks are moved closer to or away from each other to clamp or release the workpiece, the positioning fixture also comprises:

[0006] A positioning block is arranged at the clamping end and between the plurality of clamping blocks. The positioning block is provided with a plurality of detection air holes. The positioning block can be attached to or separated from the workpiece to seal or open the detection air holes.

[0007] Furthermore, the positioning block has a connecting end and a positioning end which are opposite to each other, the connecting end is connected to the chuck, and the positioning end is protrudingly provided with a plurality of positioning columns, each of which has a positioning surface which can fit with the workpiece.

[0008] Furthermore, one end of the detection air hole passes through the positioning surface.

[0009] Furthermore, the distances between the plurality of positioning posts and the rotation center of the chuck are equal.

[0010] Furthermore, a plurality of air-filling holes are provided on the side surface of the positioning column, and the air-filling holes are communicated with the detection air holes.

[0011] Furthermore, the chuck is provided with a plurality of slideways, and the slideways are gradually inclined outwards along the chuck toward the positioning block;

[0012] Each of the slideways is provided with a sliding block, and the sliding block is connected to the clamping block.

[0013] Furthermore, it also includes a driving disk, and a plurality of the sliding blocks are simultaneously connected to the driving disk. The driving disk can move along the axial direction of the chuck to drive the sliding blocks to slide in the slideway.

[0014] Furthermore, it also includes a hydraulic pump, which is connected to the driving disk and is used to drive the driving disk to move along the axial direction of the chuck.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects:

[0016] (1) When installing the workpiece, make the end of the workpiece fit with the surface of the positioning block, and then bring multiple clamping blocks close to each other to clamp the workpiece. After clamping, introduce gas of the same pressure into multiple detection holes and measure the air pressure in each detection hole. Compare the air pressure in each detection hole. If the air pressure in all detection holes is the same, it means that the end face of the workpiece is completely in contact with the surface of the positioning block; if there is a large difference in the air pressure of each detection hole, it means that the end face of the workpiece is not in contact with the surface of the positioning block. At this time, the axial direction of the workpiece needs to be adjusted until the air pressure of multiple detection holes is consistent. In this way, precise axial positioning of the workpiece can be achieved, ensuring that the center axis of the workpiece coincides with the rotation axis, and preventing the workpiece from jumping during rotation and damaging the needle roller.

[0017] (2) Since the inclination direction of the slide groove is from the chuck toward the positioning block, the advantage of this arrangement is that when the multiple clamping blocks are close to each other, the positioning block also moves toward the chuck, so that when the multiple clamping blocks clamp the side of the workpiece, they can also provide a force on the workpiece to make the workpiece move toward the positioning block, so that the end face of the workpiece fits with the positioning surface, which is conducive to the precise axial positioning of the workpiece.

[0018] (3) Driven by a hydraulic pump, the original driving source of the manual locking claw is replaced. The hydraulic drive has a greater locking force and better stability, which can prevent the workpiece from loosening during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the positioning fixture in the embodiment;

[0020] Figure 2 It is a schematic diagram of the structure of the clamping block, the sliding block and the driving disk in the embodiment;

[0021] Figure 3This is a schematic diagram of the structure of the positioning block in the embodiment;

[0022] Figure 4 It is a structural schematic diagram of the slideway in the embodiment;

[0023] In the figure:

[0024] 100, positioning block; 110, positioning column; 111, positioning surface; 112, detection air hole; 113, charging hole;

[0025] 200, clamping block; 210, slider; 220, drive disc;

[0026] 300, chuck; 310, slideway. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] Please refer to Figure 1-Figure 4 The utility model discloses a positioning fixture with an airtightness detection function, the positioning fixture comprises a rotatable chuck 300, the chuck 300 has a clamping end, a plurality of clamping blocks 200 are arranged on the clamping end, the plurality of clamping blocks 200 are moved closer to or away from each other to clamp or release the workpiece, the positioning fixture also comprises:

[0029] The positioning block 100 is arranged at the clamping end and between the plurality of clamping blocks 200 . The positioning block 100 is provided with a plurality of detection air holes 112 . The positioning block 100 can be attached to or separated from the workpiece to seal or open the detection air holes 112 .

[0030] In the present application, a plurality of clamping blocks 200 are arranged at the clamping end of the chuck 300. When the plurality of clamping blocks 200 are brought close to each other, they can clamp the side of the workpiece, and when they are moved away from each other, they can release the workpiece, so as to achieve clamping of the workpiece.

[0031] More importantly, a positioning block 100 is provided at the clamping end, and a plurality of detection air holes 112 are provided on the positioning block 100 . When the positioning block 100 is in contact with the workpiece, the plurality of detection air holes 112 can be blocked.

[0032] Specifically, when installing the workpiece, make the end of the workpiece fit with the surface of the positioning block 100, and then make multiple clamping blocks 200 close to each other to clamp the workpiece. After clamping, introduce gas of the same pressure into multiple detection holes 112 and measure the air pressure in each detection hole 112. Compare the air pressure in each detection hole 112. If the air pressure in all detection holes 112 is the same, it means that the end face of the workpiece is completely in contact with the surface of the positioning block 100; if there is a large difference in the air pressure of each detection hole 112, it means that the end face of the workpiece is not in contact with the surface of the positioning block 100. At this time, the axial direction of the workpiece needs to be adjusted until the air pressure of multiple detection holes 112 is consistent. In this way, accurate axial positioning of the workpiece can be achieved, ensuring that the center axis of the workpiece coincides with the rotation axis, and preventing the workpiece from jumping during rotation and damaging the needle roller.

[0033] It should be noted that due to the influence of the surface processing accuracy of the workpiece end face and the positioning block 100, the end face of the workpiece cannot completely seal the detection hole 112. Therefore, the air pressure in the detection hole 112 is bound to be lower than the air pressure of the introduced gas. However, as long as the air pressures of multiple detection holes 112 are equal (or within the allowable error range), it can be said that the end face of the workpiece is parallel (fitted) to the surface of the positioning block 100, and precise axial positioning of the workpiece can be achieved.

[0034] Furthermore, the positioning block 100 has a connecting end and a positioning end which are opposite to each other, the connecting end is connected to the chuck 300, and the positioning end is protruding with a plurality of positioning columns 110, each of which has a positioning surface 111 which can fit with the workpiece.

[0035] Furthermore, one end of the detection air hole 112 passes through the positioning surface 111 .

[0036] It should be noted that if the ends of multiple detection holes 112 are located on the same positioning surface 111, in order to make the workpiece end face fit with the positioning surface 111, the machining accuracy of the two surfaces must be very high, otherwise, the protrusions and depressions on the surface will cause the two surfaces to not fit together, and it will be impossible to achieve accurate axial positioning of the workpiece through the detection holes 112. Therefore, this greatly increases the machining cost of the positioning surface 111 and the workpiece end face.

[0037] Based on this, the present application sets a plurality of positioning posts 110 protruding from the positioning block 100. It is only necessary to process the positioning surface 111 with a smaller area on the positioning posts 110. There is no requirement for the surface accuracy of the remaining areas on the positioning block 100, thereby reducing the cost of surface processing.

[0038] Furthermore, the distances between the plurality of positioning posts 110 and the rotation center of the chuck 300 are equal.

[0039] The distances between the plurality of positioning posts 110 and the rotation center of the chuck 300 are equal, so that the positioning block 100 has better dynamic balance when rotating together with the workpiece, thereby preventing the workpiece from bouncing when rotating.

[0040] Furthermore, a plurality of air-filling holes 113 are formed on the side surface of the positioning column 110 , and the air-filling holes 113 are communicated with the detection air holes 112 .

[0041] Furthermore, the multiple inflation holes 113 are connected to the same air pump, and the multiple inflation holes are inflated by the air pump, so that the pressure of the gas introduced into the multiple detection holes 112 can be guaranteed to be consistent, thereby avoiding detection errors.

[0042] Furthermore, a plurality of slideways 310 are provided on the chuck 300, and the slideways 310 are gradually inclined outwards along the chuck 300 toward the positioning block 100;

[0043] A slider 210 is disposed on each of the slideways 310 , and the slider 210 is connected to the clamping block 200 .

[0044] Specifically, by sliding the multiple sliders 210 in the slideway 310 , the multiple clamping blocks 200 can be driven to move closer to or farther from each other, so as to clamp or release the workpiece.

[0045] More importantly, since the inclination direction of the slide groove is outward from the chuck 300 toward the positioning block 100, the advantage of such a setting is that when the multiple clamping blocks 200 are close to each other, the positioning block 100 also moves toward the chuck 300, so that when the multiple clamping blocks 200 clamp the side of the workpiece, they can also provide a force to the workpiece toward the positioning block 100, prompting the end face of the workpiece to fit with the positioning surface 111, which is conducive to the precise axial positioning of the workpiece.

[0046] Furthermore, a driving disk 220 is included, and a plurality of the sliders 210 are simultaneously connected to the driving disk 220 . The driving disk 220 can move along the axial direction of the chuck 300 to drive the sliders 210 to slide in the slideway 310 .

[0047] A plurality of slide blocks 210 are driven to slide simultaneously by a driving disk 220 , so as to realize synchronous movement of the plurality of slide blocks 210 , thereby ensuring that the workpiece is clamped at the center position.

[0048] Furthermore, a hydraulic pump is included, which is connected to the driving disk 220 and is used to drive the driving disk 220 to move along the axial direction of the chuck 300 .

[0049] Specifically, it is driven by a hydraulic pump to replace the original driving source of the manual locking claw. The hydraulic drive has a greater locking force and better stability, and can prevent the workpiece from loosening during processing.

[0050] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A positioning fixture with air tightness detection function, the positioning fixture comprises a rotatable chuck, the chuck has a clamping end, a plurality of clamping blocks are arranged on the clamping end, and the plurality of clamping blocks move closer to or away from each other to clamp or release a workpiece, characterized in that: The positioning fixture also includes: A positioning block is arranged at the clamping end and between the plurality of clamping blocks. The positioning block is provided with a plurality of detection air holes. The positioning block can be attached to or separated from the workpiece to seal or open the detection air holes.

2. A positioning fixture with airtightness detection function according to claim 1, characterized in that: The positioning block comprises a connecting end and a positioning end which are opposite to each other, the connecting end is connected to the chuck, a plurality of positioning columns are protruded from the positioning end, and each positioning column has a positioning surface which can be fitted with a workpiece.

3. A positioning fixture with airtightness detection function according to claim 2, characterized in that: One end of the detection air hole passes through the positioning surface.

4. The positioning fixture with airtightness detection function according to claim 2, characterized in that: The distances between the plurality of positioning posts and the rotation center of the chuck are equal.

5. The positioning fixture with airtightness detection function according to claim 2, characterized in that: A plurality of air-filling holes are provided on the side surface of the positioning column, and the air-filling holes are communicated with the detection air holes.

6. The positioning fixture with airtightness detection function according to claim 1, characterized in that: The chuck is provided with a plurality of slideways, and the slideways gradually tilt outwards along the chuck toward the positioning block; Each of the slideways is provided with a sliding block, and the sliding block is connected to the clamping block.

7. A positioning fixture with airtightness detection function according to claim 6, characterized in that: It also includes a driving disk, and a plurality of the sliding blocks are simultaneously connected to the driving disk. The driving disk can move along the axial direction of the chuck to drive the sliding blocks to slide in the slideway.

8. The positioning fixture with airtightness detection function according to claim 7, characterized in that: It also includes a hydraulic pump, which is connected to the driving disk and is used to drive the driving disk to move along the axial direction of the chuck.

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