Mechanism for detecting clearance degree of core sleeve

Abstract

The utility model relates to a mechanism for detecting the clearance degree of a core sleeve. The measuring device comprises a measuring ring which can be matched with a mandrel to be measured in an inserted mode. The shaft supporting device is arranged on the workbench and located beside the measuring ring, and the shaft supporting device is used for supporting a mandrel to be measured and enabling the mandrel to be measured to be coaxial with the axis of an inner hole of the measuring ring; the center positioning device comprises a supporting device and a jacking device, the supporting device comprises a lower center shaft which is coaxial with the measuring ring, the lower center shaft can move along an inner hole of the measuring ring and is supported at the lower end of the mandrel to be measured, and the jacking device is used for jacking the upper end of the mandrel to be measured; and the measurement driving device is used for driving the center positioning device to move so as to enable the mandrel to be measured to move to different positions along the inner hole of the measuring ring. According to the utility model, the detection error is reduced, and the accuracy of the detection result is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial detection technical field especially is a kind of mechanism for core cover clearance degree detection. BACKGROUND

[0002] In the technical field of hydraulic, pneumatic, etc., the reciprocating movement of shaft in sleeve component makes the volume of sealed working cavity change, so as to realize the suction and pressure of fluid. Therefore, the matching precision between shaft and sleeve component is crucial. Among all matching precision requirements, the coaxiality precision is particularly critical, and it is usually necessary to ensure that the error is controlled within the range of ±2 microns. This is because the deviation of coaxiality directly affects the matching tightness between shaft and sleeve. Once the coaxiality deviation occurs, the movement of shaft will be blocked, the friction will be increased, and even leakage problem will occur, thereby seriously affecting the oil (gas) pumping capacity and the normal operation of the system.

[0003] To ensure that this high-precision requirement is met, professional measuring tools must be used during the installation of shaft and sleeve, and the matching size and processing precision must be strictly controlled, while following the standard centering process for detailed adjustment. The current commonly used detection method is as follows:

[0004] By detecting the matching condition of the outer diameter of shaft core and the inner diameter of sleeve, the gap value between them is calculated using gas flow.

[0005] Insert the outer circle of shaft core into the inner hole of measuring ring, and make it contact with the inner hole of measuring ring. At the same time, insert the inner hole of sleeve into the measuring rod, and make the outer circle of measuring rod contact with the inner hole of sleeve. Since there is a gap between the outer circle of shaft core and the inner hole of measuring ring, and between the inner hole of sleeve and the outer circle of measuring rod, by introducing 3Bar compressed air into the gap and converting the gas flow into an electrical signal, the gap value between shaft core and sleeve can be calculated.

[0006] During the detection process, four points of shaft core and four points of sleeve are detected, and the gap values of four points between shaft core and sleeve are calculated respectively.

[0007] However, the existing method has the following problems: the gas flow is unstable due to unstable air pressure, which affects the detection result of gas flow meter: the shaft core is not effectively positioned in the measuring ring, which causes different eccentricity of shaft core when put into the measuring ring each time, thereby causing the change of gas flow and affecting the accuracy of shaft core outer diameter detection result: the CGK (detection capability index) value of the existing structure is 0.2 when continuously detecting the same shaft and sleeve product for 50 times, which is far lower than the required standard value of 1.33. Therefore, it is urgent to propose an improvement scheme to improve the detection accuracy. SUMMARY

[0008] Therefore, the utility model provides a kind of mechanism for core cover clearance degree detection, reduces detection error, and improves the accuracy of detection result.

[0009] To solve the above technical problems, the utility model provides a kind of mechanism for core cover clearance detection, including workbench, still including:

[0010] Measuring device, including the measuring ring that can be inserted with the measured mandrel;

[0011] Shaft supporting device, it is located on the workbench and is located at the side of the measuring ring, and the shaft supporting device is used to support and make the measured mandrel coaxial with the axis of the measuring ring inner hole;

[0012] Center positioning device, including support device and jacking device, the support device includes the lower center axis that is coaxially arranged with the measuring ring, and the lower center axis can be moved along the measuring ring inner hole and is supported on the lower end of the measured mandrel, and the jacking device is used to jacking the upper end of the measured mandrel;

[0013] Measuring drive device is used to drive the center positioning device to move, so that the measured mandrel moves to different positions along the inner hole of the measuring ring.

[0014] In an embodiment of the utility model, the measuring device further includes measuring base, the measuring ring is embedded in the measuring base, and the side wall of the measuring base is provided with the air hole that is communicated with the measuring ring inner hole.

[0015] In an embodiment of the utility model, the shaft supporting device includes clamping cylinder and two clamping blocks connected with the driving end of the clamping cylinder, each clamping block is provided with the arc slot that is adapted to the outer circle of the measured mandrel, and when the clamping cylinder is closed, the arc slot of each clamping block forms the positioning hole for the positioning of the measured mandrel.

[0016] In an embodiment of the utility model, the jacking device includes rotary cylinder, rotary arm connected with the driving end of the rotary cylinder and upper center axis connected with the rotary arm.

[0017] In an embodiment of the utility model, the workbench is provided with guide rod, and the rotary arm is provided with guide sleeve, when the upper center axis rotates to jacking position, the guide sleeve can be slid with guide rod.

[0018] In an embodiment of the utility model, the measuring drive device includes servo linear module installed on the workbench, and the servo linear module is slidably connected with moving seat, and the support device and jacking device are both installed on the moving seat.

[0019] In an embodiment of the utility model, the both sides of the workbench are provided with quick-change base plate connected to external structure.

[0020] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0021] The mechanism for detecting the clearance of a core sleeve has the advantages that the measurement device and the center positioning device are driven by the measurement driving device to move, a plurality of measurement points or shafts of different specifications can be detected on the same detection platform, the detection efficiency and applicability are greatly improved, and the mechanism is combined with an external mechanical hand to automatically feed and discharge, batch and full-automatic detection can be realized, manpower is saved, and human operation errors are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the utility model more easily and clearly understood, the utility model will be further described in detail below according to the specific embodiments of the utility model and in combination with the drawings.

[0023] Figure 1 is the overall structure schematic view of the mechanism for detecting the clearance of a core sleeve.

[0024] Figure 2 is the structure schematic view of the shaft supporting device.

[0025] Figure 3 is the structure schematic view of the measurement device.

[0026] Figure 4 is the sectional structure schematic view of the measurement device.

[0027] Figure 5 is the structure schematic view of the center positioning device.

[0028] EXPLANATION OF REFERENCE NUMERALS IN DRAWINGS:

[0029] 1, measurement device; 11, measurement ring; 12, measurement base; 121, air hole;

[0030] 2, shaft supporting device; 21, clamping cylinder; 22, clamping block; 23, positioning hole;

[0031] 3, supporting device; 31, lower center axis;

[0032] 4, centering device; 41, rotating cylinder; 42, rotating arm; 43, upper center axis; 44, guide rod; 45, guide sleeve;

[0033] 5, measurement driving device; 51, servo linear module; 52, moving seat;

[0034] 6, workbench; 61, quick-change bottom plate;

[0035] 7, to-be-detected core shaft. DETAILED DESCRIPTION

[0036] The utility model makes further illustration to the utility model below combining with the drawings and specific embodiment, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation to the utility model.

[0037] In the utility model, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the utility model, and is not indicative or suggestive of the technical features indicated must have a specific orientation, structure and operation in a specific orientation, therefore, it cannot be understood as a limitation of the utility model.

[0038] In the utility model, the meaning of "several" is one or more, and the meaning of "multiple" is two or more, "greater than", "less than", "more than" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the utility model, if "first" and "second" are described, they are only used for distinguishing technical features for the purpose, and cannot be understood as indicative or suggestive of relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0039] In the utility model, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements inside or two elements. The person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0040] Referring to Figure 1 The utility model discloses a mechanism for core sleeve clearance detection, including workbench 6, still include:

[0041] Measuring device 1, including the measuring ring 11 that can be inserted with the measured core shaft 7;

[0042] Shaft supporting device 2 is arranged on the workbench 6 and is located at the side of the measuring ring 11, and the shaft supporting device 2 is used to support and make the measured core shaft 7 coaxial with the axis of the inner hole of the measuring ring 11;

[0043] Center positioning device, including support device 3 and jacking device 4, the support device 3 includes the lower center axis 31 that is arranged coaxially with the measuring ring 11, the lower center axis 31 can move along the inner hole of the measuring ring 11 and support the lower end of the measured core shaft 7, and the jacking device 4 is used to jacking the upper end of the measured core shaft 7;

[0044] A measuring driving device 5 is arranged to drive the center positioning device to move, so as to move the measured mandrel 7 to different positions along the inner hole of the measuring ring 11.

[0045] In one embodiment, as shown in Figure 3 , Figure 4 The measuring device 1 further comprises a measuring base 12, and the measuring ring 11 is embedded in the measuring base 12. The side wall of the measuring base 12 is provided with a vent hole 121 communicating with the inner hole of the measuring ring 11. In addition, the airflow detection mode is often affected by external air pressure fluctuations. The device adds the vent hole 121 to the side wall of the measuring base 12 and is equipped with a high-precision pressure reducing valve, which enhances the suppression ability of external air source fluctuations and stabilizes the flow detection results.

[0046] In one embodiment, as shown in Figure 2 The shaft supporting device 2 comprises a clamping cylinder 21 and two clamping blocks 22 connected to the driving end of the clamping cylinder 21. Each clamping block 22 is provided with an arc-shaped groove matched with the outer circle of the measured mandrel 7. When the clamping cylinder 21 is closed, the arc-shaped grooves of the two clamping blocks 22 form a positioning hole 23 for positioning the measured mandrel 7. It can be understood that the measured mandrel 7 can move in the positioning hole 23.

[0047] Through the cooperation of the shaft supporting device 2 and the center positioning device, the measured mandrel 7 can be accurately positioned in the hole of the measuring ring 11, avoiding the eccentric problem caused by randomly placing the mandrel into the inner hole of the measuring ring 11, thereby significantly reducing the detection error.

[0048] In one embodiment, as shown in Figure 5 The tightening device 4 comprises a rotating cylinder 41, a rotating arm 42 connected to the driving end of the rotating cylinder 41, and an upper center axis 43 connected to the rotating arm 42. Through the cooperation of the upper center axis 43 and the lower center, the center positioning of the measured mandrel 7 during detection is realized, reducing the influence of eccentricity on the measured mandrel 7 in the measuring ring 11.

[0049] In one embodiment, the workbench 6 is provided with a guide rod 44, and the rotating arm 42 is provided with a guide sleeve 45, which can slide with the guide rod 44 when the upper center shaft 43 rotates to the clamping position. Generally, the clamping stroke of the rotating cylinder 41 is 20 mm, and the swing angle is 90±4°. However, due to the low accuracy of the swing angle (error of ±4°, which cannot meet the actual use requirements, especially the accuracy requirement of ±0.05°), the center hole of the center of the measured mandrel 7 cannot be accurately positioned. In order to solve this problem, the guide sleeve 45 and the guide rod 44 are arranged, and the center center is guided to the guide rod 44 by the action of the clamping cylinder 21. Through the accurate sliding of the guide rod 44, the center center can be accurately aligned with the center hole of the measured shaft, so as to realize higher accuracy positioning and clamping.

[0050] In one embodiment, the measurement driving device 5 comprises a servo linear module 51 mounted on the workbench 6, and a moving seat 52 is slidably connected to the servo linear module 51. The support device 3 and the clamping device 4 are both mounted on the moving seat 52, so as to realize the control requirement of the shaft point position. In addition, an external mechanical hand is arranged to load the measured mandrel 7 to the position of the clamping cylinder 21, so as to ensure the full automatic detection requirement. Through the servo module, when the distance between the four detection points of the product changes, it is convenient to change. When there are different types of shafts, the servo position can be modified to adapt to the requirements of multiple varieties.

[0051] In one embodiment, the workbench 6 is provided with a quick-change bottom plate 61 connected to an external structure. It is convenient to integrate with an external production line or other detection units, and can be quickly disassembled and maintained;

[0052] Due to the accurate mechanical positioning (center center, guide rod 44) and stable control of gas flow of the mechanism, the detection repeatability is significantly improved. For high-precision (±2 microns) occasions, the CGK value of continuous detection can reach 1.4, which is much higher than the original detection method of 0.2, and can better meet the high-precision production requirements.

[0053] Working process:

[0054] The external mechanical hand grabs the measured mandrel 7 from the previous process or a special material bin and places it on the shaft supporting device 2 of the mechanism. The clamping cylinder 21 acts, and the two clamping blocks 22 are closed to stably clamp the outer circle of the mandrel, which can effectively limit the mandrel and ensure that it will not be offset.

[0055] After the robot releases and leaves, the servo linear module 51 drives the moving seat 52 on which the rotary cylinder 41 is installed to move upward or horizontally, so that the upper center shaft 43 approaches the upper end of the mandrel, the rotary cylinder 41 drives the rotary arm 42 and the upper center shaft 43 to rotate to a predetermined angle, and the precise centering positioning is realized by the cooperation of the guide rod 44 and the guide sleeve 45, and then the upper end of the mandrel is clamped, and the lower center shaft 31 forms stable two-point positioning.

[0056] The servo linear module 51 drives the mandrel (under the driving of the center positioning device) to move upward, downward or in a specified direction along the inner hole of the measuring ring 11 according to the pre-set measuring point distance or position information. When reaching each detection point position, constant pressure (for example, 3 Bar) compressed air is introduced into the gap between the inner hole of the measuring ring 11 and the outer circle of the mandrel, and the gap change is detected through a pneumatic flow meter, and after the measurement of each point is completed, the system automatically records and stores the outer diameter data of the point.

[0057] After the four-point measurement is completed, the system uploads the data to the upper computer or industrial computer.

[0058] The servo linear module 51 retreats to the initial position, the rotary cylinder 41 releases the clamping, and the center center separates the mandrel.

[0059] The external robot regrasps the mandrel after the detection is completed and sends it to the subsequent link (such as qualified product circulation, unqualified product rejection, etc.). The shaft clamping cylinder is also released, and waits for the arrival of the next mandrel.

[0060] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the utility model and are not limited. Although the utility model is described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.

Claims

1. A mechanism for core wrap gap detection, characterized by, Including the workbench (6), it also includes: The measuring device (1) includes a measuring ring (11) that can be inserted into the mandrel (7) to be measured. A shaft support device (2) is set on the workbench (6) and located next to the measuring ring (11). The shaft support device (2) is used to support and make the mandrel (7) to be tested coaxial with the axis of the inner hole of the measuring ring (11). The center positioning device includes a support device (3) and a clamping device (4). The support device (3) includes a lower center shaft (31) coaxially arranged with the measuring ring (11). The lower center shaft (31) can move along the inner hole of the measuring ring (11) and is supported on the lower end of the mandrel (7) to be tested. The clamping device (4) is used to clamp the upper end of the mandrel (7) to be tested. The measuring drive device (5) is used to drive the center positioning device to move so that the mandrel (7) to be measured moves to different positions along the inner hole of the measuring ring (11).

2. A mechanism for core wrap gap detection as claimed in claim 1, wherein, The measuring device (1) further includes a measuring base (12), the measuring ring (11) is fitted into the measuring base (12), and the side wall of the measuring base (12) is provided with a vent (121) that communicates with the inner hole of the measuring ring (11).

3. A mechanism for core wrap gap detection as claimed in claim 1, wherein, The shaft support device (2) includes a clamping cylinder (21) and two clamping blocks (22) connected to the driving end of the clamping cylinder (21). Each clamping block (22) is provided with an arc-shaped groove that is adapted to the outer circle of the mandrel (7) to be tested. When the clamping cylinder (21) is closed, the arc-shaped grooves of the two clamping blocks (22) respectively form positioning holes (23) for positioning the mandrel (7) to be tested.

4. A mechanism for core wrap gap detection as claimed in claim 1, wherein, The clamping device (4) includes a rotary cylinder (41), a rotary arm (42) connected to the drive end of the rotary cylinder (41), and an upper center shaft (43) connected to the rotary arm (42).

5. A mechanism for core wrap gap detection as claimed in claim 4, wherein, The workbench (6) is provided with a guide rod (44), and the rotating arm (42) is equipped with a guide sleeve (45). When the upper center shaft (43) rotates to the top position, the guide sleeve (45) can slide in cooperation with the guide rod (44).

6. A mechanism for core wrap gap detection as claimed in claim 1, wherein, The measurement drive device (5) includes a servo linear module (51) mounted on the worktable (6), and a movable seat (52) is slidably connected to the servo linear module (51). The support device (3) and the clamping device (4) are both mounted on the movable seat (52).

7. A mechanism for core wrap gap detection as claimed in claim 1, wherein, The workbench (6) is provided with quick-change base plates (61) at both ends that are connected to the external structure.

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