Finish turning clamp with airtightness detection function

Abstract

The objective of the utility model is to solve the technical problems of complex structure, difficulty in guaranteeing installation precision and insufficient air tightness caused by air tightness detection through a clamping jaw in the prior art. The finish turning clamp with the airtightness detection function comprises a chuck, at least three clamping jaws arranged on the end face of one end of the chuck, at least three supporting blocks arranged on the end face of one end of the chuck, a connecting rod arranged in a first through hole formed in the chuck along the central axis and an air pipe. A second through hole is formed in the connecting rod along the central axis, one end of the air pipe is arranged in the second through hole, the other end of the air pipe is communicated with an air source, a supporting adapter plate is arranged on the end face of one end of the chuck, a plurality of first air channels are formed in the supporting adapter plate, and a second air channel is formed in the supporting block. The other ends of the first air passages are communicated with one ends of second air passages in the at least three supporting blocks in a one-to-one correspondence manner, the other ends of the second air passages are located at the ends, away from the supporting adapter plate, of the supporting blocks, and outlets correspond to the airtight end face of the to-be-detected air cylinder.

Description

Technical Field

[0001] The utility model relates to a cylinder clamp, in particular to a precision turning clamp with an airtight detection function. Background Art

[0002] With the development of automated processing in workshops, the power take-off cylinder processing line needs to change the current manual production line to an automatic production line to improve processing efficiency. In order to ensure the required processing accuracy, the first process of the power take-off cylinder processing line adopts fine turning fixture positioning processing. The fine turning fixture of the cylinder processing line mostly adopts a positioning clamping method of rigid expansion sleeve tightening the outer circle and fixed support structure supporting the positioning end face. However, the tightening amount of the rigid expansion sleeve is limited, and the fixture structure design of the rigid expansion sleeve tightening the outer circle is complex, which is greatly limited by the outer circle size of the cylinder, resulting in this fixture structure itself being bulky and complex to install on a horizontal CNC lathe. Therefore, this fixture structure is not conducive to the processing of the cylinder fine turning process.

[0003] Since the tolerance of the positioning outer circle of the cylinder is large, the length of the positioning outer circle is short and the distance to the positioning end face is close, the standard chuck and jaws are more suitable as the fixture for this process. The positioning outer circle of the cylinder is tightly held by the jaws, and the end face positioning of the cylinder is realized by the upper end face of the jaws, thereby realizing the positioning and clamping of the power take-off cylinder. However, since the existing chuck will drive the jaws to move radially, it is difficult for the end face of the jaws to realize the cylinder airtightness detection function. For example: Chinese patent CN217168168U, named a technical solution of an airtight detection fixture, a chuck and at least three jaws are set. When in use, the jaws move toward the axial direction of the chuck to clamp the workpiece. In this solution, a gas channel is set in the jaws for airtightness detection. However, it can be seen that the airtightness detection through the jaws makes the overall structure of the fixture complicated, and it is difficult to ensure the installation accuracy. The airtightness of the jaws during use is also difficult to ensure, which affects production efficiency. In the technical solution of the Chinese patent CN211305534U, named as the centering lathe fixture for the inner hole of the outer teeth of the gear, although a gas channel is set up for detecting air tightness, it realizes end face positioning and centering through the cooperation of the positioning plate, piston and spring chuck, and its centering clamping method cannot be applied to the centering of the cylinder. Therefore, it is necessary to design a fixture that can realize the air tightness detection function and can cooperate with the robot gripper to realize the automated production requirements of the efficient cylinder processing line. Utility Model Content

[0004] The utility model aims to solve the technical problems in the prior art of performing air tightness detection through clamping claws, which leads to complex structure, difficulty in ensuring installation accuracy and insufficient air tightness, and to provide a precision turning fixture with an air tightness detection function.

[0005] To achieve the above purpose, the technical solutions provided by the utility model are as follows:

[0006] A finishing turning fixture with an airtight detection function comprises a chuck, at least three claws arranged on the end face of one end of the chuck, and a first through hole is arranged on the chuck along the central axis. The special feature of the chuck is that it also comprises at least three support blocks arranged on the end face of one end of the chuck, a connecting rod arranged in the first through hole, and an air pipe; the connecting rod is provided with a second through hole along the central axis, one end of the air pipe is arranged in the second through hole, and the other end extends out from the other end face of the chuck for connecting to an air source; a support adapter plate is arranged on the end face of one end of the chuck, and a plurality of first air channels are arranged inside the support adapter plate, and one end of the first air channels is connected to the second through hole; the support block is fixedly connected to the support adapter plate, and a second air channel is arranged inside the support block, and the other ends of the plurality of first air channels are respectively and one-to-one connected to one end of the second air channels in at least three support blocks, and the other end of the second air channel is located at the end of the support block away from the support adapter plate, and the outlet is arranged corresponding to the airtight end face of the cylinder to be detected.

[0007] Furthermore, the second through hole is a stepped hole, a small diameter section of the stepped hole is arranged close to the supporting adapter plate, and one end of the air pipe is arranged in the large diameter section of the second through hole.

[0008] Furthermore, the at least three support blocks and the at least three claws are evenly arranged along the circumference of the circles where they are located;

[0009] Furthermore, the number of the clamping claws and the number of the supporting blocks are both three, and the clamping claws and the supporting blocks are evenly spaced along the circumferential direction;

[0010] The support adapter plate is provided with an avoidance notch at a position corresponding to the soft claw.

[0011] The centering and end face positioning of the cylinder can be achieved by selecting three clamping jaws and supporting blocks, and more clamping jaws and supporting blocks can be used as needed.

[0012] Further, the claw is a soft claw. Preferably, the soft claw avoids abrasion of the cylinder when in contact with the cylinder.

[0013] Furthermore, the first air channel is arranged in a radial direction.

[0014] Furthermore, an O-ring is provided between the inner wall of the second through hole in the connecting rod and the air pipe;

[0015] The chuck is fixedly connected to the support adapter plate by connecting bolts;

[0016] The connecting rod is fixedly connected to the supporting adapter plate by bolts;

[0017] The support block is fixedly connected to the support adapter plate by bolts.

[0018] Furthermore, the end surface roughness of one end of the support block is Ra1.6, and the parallelism is 0.01 mm.

[0019] Beneficial effects of the utility model:

[0020] The utility model discloses a precision turning fixture with an airtight detection function. A support block is added for end face positioning and airtight detection. The clamping jaws are only used for centering the cylinder. The centering and positioning functions are separated, thereby avoiding the problem of complex airtight detection structure and difficulty in ensuring airtightness due to the movement of the clamping jaws. The demand for automated production of the cylinder processing line is met, and the production efficiency of the cylinder processing line is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view of an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 AA section view;

[0023] Figure 3 yes Figure 1 BB cross-sectional view.

[0024] Description of reference numerals:

[0025] 1-air pipe, 2-O-ring, 3-connecting rod, 4-connecting bolt, 5-support adapter plate, 6-plug, 7-support block, 8-soft claw, 9-chuck, 10-cylinder. DETAILED DESCRIPTION

[0026] The utility model provides a fine turning fixture with airtight detection function. Figure 1 and Figure 2 As shown, it includes a chuck 9, at least three soft claws 8, at least three support blocks 7, a support adapter plate 5, a connecting rod 3, and an air pipe 1. The chuck 9 is a 10-inch standard chuck 9, a first through hole is arranged along the central axis, the connecting rod 3 is arranged through the first through hole, a second through hole is arranged along the central axis of the connecting rod 3, the support adapter plate 5 is located on one end face of the chuck 9, a plurality of first air passages are arranged inside it, one end of the plurality of first air passages corresponds to the second through hole, one end of the air pipe 1 is arranged through the second through hole and is connected with the first air passage, and the other end extends from the other end face of the chuck 9 for connecting to the air source. The chuck 9 and the support adapter plate 5 are fixedly connected by connecting bolts 4. For the convenience of installation, the connecting bolts 4 are selected as long bolts, such as Figure 3 As shown, the long bolt passes through the chuck 9 and the support adapter plate 5 to fix it to the working platform, and the connecting rod 3 is fixedly connected to the support adapter plate 5 by bolts.

[0027] Preferably, the second through hole is a stepped hole, and the small diameter section of the stepped hole is arranged close to the support adapter plate 5, which can be suitable for air pipes 1 of different diameters. When an air pipe 1 with a diameter matching the large diameter end of the stepped hole is used, the end of the air pipe 1 is against the step. When an air pipe 1 with a diameter matching the small diameter section is used, one end of the air pipe 1 can be inserted into the small diameter section for fixation, thereby improving the stability of the air pipe 1. At the same time, the small diameter section is close to the connection between the connecting rod 3 and the support adapter plate 5 to avoid interference with the bolt holes opened on the connecting rod 3 at the connection.

[0028] At least three soft claws 8 are arranged on one end surface of the chuck 9 and are evenly distributed along the circumference of the circle where they are located. The support adapter plate 5 is provided with an avoidance gap at the position corresponding to the soft claws 8. At least three support blocks 7 are evenly arranged along the circumference of the circle where they are located. Figure 1 As shown, the support block 7 is fixedly connected to the support adapter plate 5 by bolts, and a second air passage is arranged inside the support block 7. The other ends of the plurality of first air passages are respectively connected to one end of the second air passages in at least three support blocks 7 in a one-to-one correspondence. The other end of the second air passage is located at the end of the support block 7 away from the support adapter plate 5, and the outlet is arranged corresponding to the airtight end face of the cylinder 10 to be tested. In this embodiment, three soft claws 8 and three support blocks 7 are arranged, and the soft claws 8 and the support blocks 7 are evenly spaced along the circumferential direction.

[0029] In this embodiment, the other end outlet of the second air channel is located at the upper end face of the support block 7, and the upper end face of the support block 7 contacts the airtight end face of the cylinder 10 to be tested. When the gas source is turned on, the upper end face of the support block 7 and the airtight end face of the cylinder 10 to be tested are tested to see if they are tightly fitted. The amount of gas leakage between the upper end face of the support block 7 and the airtight end face of the cylinder 10 to be tested is used to determine whether the airtightness is qualified, thereby determining whether the cylinder 10 to be tested is installed in place. The upper end face of the support block 7 is generally required to have a roughness of Ra1.6 and a parallelism of 0.01mm. The airtight end face of the cylinder 10 to be tested is required to be flat, without protrusions, and is an end face formed after rough turning.

[0030] To reduce airflow resistance, the first air channel is preferably arranged radially, and for the convenience of processing, a branch connected to the outside is arranged radially at the other end of the first air channel, and a plug 6 is arranged at the branch opening to seal the first air channel. To facilitate processing, a branch connected to the outside is also arranged radially at the other end of the second air channel, and a plug 6 is arranged at the branch opening.

[0031] The utility model adopts the principle of separate arrangement of centering and positioning. The soft claw 8 installed on the chuck 9 only provides the centering function of the cylinder 10, and does not provide the end face positioning function. The support block 7 realizes the end face positioning function. The support block 7 is provided with a 1mm airtight detection hole required for airtight detection to realize the airtight detection function. The horizontal CNC lathe has been modified, and an air path is added to the tail of the lathe, and a rotary joint is added to realize the rotational movement of the fine turning process. The hollow space in the middle of the lathe provides a φ8mm air pipe 1, which is set through the connecting rod 3. In order to ensure the sealing effect of the air pipe 1 when it rotates in the middle of the connecting rod 3, an O-ring 2 for sealing is provided between it and the connecting rod 3.

[0032] In this embodiment, the working platform is a horizontal CNC lathe, and the installation method of the fine turning fixture includes the following steps:

[0033] 1) Install the chuck 9, the support adapter plate 5, the connecting rod 3 and the supporting block 7 together on the horizontal CNC lathe, insert the air pipe 1 connected to the rotary joint at the tail of the horizontal CNC lathe into the connecting rod 3, and ensure that the air pipe 1 is well sealed, leak-proof, and can rotate freely;

[0034] 2) Install the soft jaw 8 on the standard three-jaw chuck 9 of the chuck 9, and self-machine it to the corresponding dimensional tolerance of the positioning outer circle of the corresponding cylinder 10;

[0035] 3) After the fixture is installed, the continuity of the gas circuit can be detected. After the gas circuit is connected, the air tightness test of the cylinder 10 and other finishing processes can be started.

[0036] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. A fine turning fixture with airtightness detection function, comprising a chuck (9), at least three claws arranged on an end surface of one end of the chuck (9), the chuck (9) being provided with a first through hole along the central axis, characterized in that: It also includes at least three support blocks (7) arranged on an end surface of one end of the chuck (9), a connecting rod (3) arranged in the first through hole, and an air pipe (1); The connecting rod (3) is provided with a second through hole along the central axis, one end of the air pipe (1) is arranged in the second through hole, and the other end extends from the other end surface of the chuck (9) for connecting to the air source; A support adapter plate (5) is provided on one end surface of the chuck (9), a plurality of first air channels are provided inside the support adapter plate (5), and one end of each of the first air channels is connected to the second through hole; The support block (7) is fixedly connected to the support adapter plate (5), and a second air channel is arranged inside the support block (7). The other ends of the plurality of first air channels are respectively connected to one end of the second air channels in at least three support blocks (7) in a one-to-one correspondence. The other end of the second air channel is located at an end of the support block (7) away from the support adapter plate (5), and the outlet is arranged corresponding to the airtight end face of the cylinder (10) to be tested.

2. According to claim 1, a finishing fixture with airtightness detection function is characterized in that: The second through hole is a stepped hole, the small diameter section of the stepped hole is arranged close to the supporting adapter plate (5), and one end of the air pipe (1) is arranged in the large diameter section of the second through hole.

3. A finishing fixture with airtightness detection function according to claim 1 or 2, characterized in that: The at least three support blocks (7) and the at least three clamping claws are evenly arranged along the circumference of the circles where they are located.

4. According to claim 3, a finishing fixture with airtightness detection function is characterized in that: The number of the clamping claws and the supporting blocks (7) is three, and the clamping claws and the supporting blocks (7) are evenly spaced along the circumferential direction; The support adapter plate (5) is provided with an avoidance notch at a position corresponding to the clamping claw.

5. According to claim 4, a finishing fixture with airtightness detection function is characterized in that: The clamping jaws are soft clamping jaws (8).

6. According to claim 5, a finishing fixture with airtightness detection function is characterized in that: The first air channel is arranged in a radial direction.

7. A finishing fixture with airtightness detection function according to claim 6, characterized in that: An O-ring (2) is provided between the inner wall of the second through hole in the connecting rod (3) and the air pipe (1); The chuck (9) and the support adapter plate (5) are fixedly connected via connecting bolts (4); the connecting rod (3) and the support adapter plate (5) are fixedly connected via bolts; The support block (7) is fixedly connected to the support adapter plate (5) by means of bolts.

8. The finishing fixture with airtightness detection function according to claim 7, characterized in that: The end surface roughness of one end of the support block (7) is Ra1.6, and the parallelism is 0.01 mm.

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