CN115122153B - Device is examined to anchor clamps gas - Google Patents
Device is examined to anchor clamps gas Download PDFInfo
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- CN115122153B CN115122153B CN202210815448.3A CN202210815448A CN115122153B CN 115122153 B CN115122153 B CN 115122153B CN 202210815448 A CN202210815448 A CN 202210815448A CN 115122153 B CN115122153 B CN 115122153B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/002—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders
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- Jigs For Machine Tools (AREA)
Abstract
本发明涉及夹具气检设备技术领域，具体公开了一种夹具气检装置，该夹具气检装置包括至少三个定位块、至少两个定位销、气检接头、多根通气管以及气压检测单元。其中，定位块设置在平板上，定位块的气检面上设有第一气孔，定位块的非气检面上设有第二气孔，第一气孔与第二气孔连通，定位块的气检面为定位块与待加工工件的定位面接触的平面；定位销设置在平板上，待加工工件的定位面设有至少两个定位孔，一个定位销与一个定位孔插接；气检接头与气体输送设备相连；通气管的一端与气检接头连通，另一端与一个第一气孔连通，多根通气管之间并联设置；气压检测单元设置在通气管上。上述夹具气检装置，适用于所有通用夹具，提高了待加工工件的定位精度。
The invention relates to the technical field of clamp gas detection equipment, and specifically discloses a clamp gas detection device. The clamp gas detection device includes at least three positioning blocks, at least two positioning pins, gas detection joints, multiple ventilation pipes and a gas pressure detection unit. . Wherein, the positioning block is arranged on the flat plate, the gas detection surface of the positioning block is provided with a first air hole, the non-gas detection surface of the positioning block is provided with a second air hole, the first air hole is connected with the second air hole, and the gas detection surface of the positioning block is The surface is the plane where the positioning block contacts the positioning surface of the workpiece to be processed; the positioning pins are set on the flat plate, and the positioning surface of the workpiece to be processed is provided with at least two positioning holes, one positioning pin is plugged into one positioning hole; the gas detection joint is connected to The gas delivery equipment is connected; one end of the vent pipe is connected to the gas detection joint, the other end is connected to a first air hole, and multiple vent pipes are arranged in parallel; the air pressure detection unit is arranged on the vent pipe. The above-mentioned fixture gas inspection device is suitable for all general fixtures and improves the positioning accuracy of the workpiece to be processed.
Description
Technical Field
The invention relates to the technical field of clamp gas detection equipment, in particular to a clamp gas detection device.
Background
Currently, machine tool equipment requires the support location point of the part fixture to have an airtight detection function to determine the tightness of the clamping. The existing positioning airtight detection technology of the parts is that a small hole is directly drilled on the supporting surface of a clamp, and after the parts are clamped, the tightness of the small hole is detected.
Because of the limitation of cost and machine tool, the trial production workshop of the engine cylinder body generally adopts a common universal fixture, and the common universal fixture has no air detection hole and air detection device and cannot realize the air detection function, so at present, when the common universal fixture is used for checking the positioning accuracy, a workpiece is generally directly placed on the fixture, and then the clearance gauge is used for checking, and the method has the following defects:
1. when the feeler gauge is used for detection, the feeler gauges with different specifications are used for detection step by step, the precision is difficult to ensure, and the efficiency is low;
2. the partial area is difficult to operate and measure manually due to space limitation;
3. the detection time is artificially prolonged along with the generation of visual fatigue by observing eyes of workers, so that the production efficiency is lower, and the method is not suitable for mass detection.
Therefore, it is desirable to provide a gas inspection device for a fixture to solve the above-mentioned problems.
Disclosure of Invention
The invention provides a fixture air detection device which is applicable to all universal fixtures and improves the positioning precision of a workpiece to be processed.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a device is examined to anchor clamps gas for universal fixturing, universal fixturing includes the flat board, the device is examined to anchor clamps gas includes:
the device comprises at least three positioning blocks, a first air hole, a second air hole, a first air hole and a second air hole, wherein the three positioning blocks are arranged on the flat plate, a first air hole is arranged on an air detection surface of each positioning block, a second air hole is arranged on a non-air detection surface of each positioning block, the first air hole is communicated with the second air hole, and the air detection surface of each positioning block is a plane where the positioning block contacts with a positioning surface of a workpiece to be processed;
the positioning surface of the workpiece to be processed is provided with at least two positioning holes, and one positioning pin is spliced with one positioning hole;
the gas detection joint is connected with the gas conveying equipment;
the air detection joint is communicated with the air detection hole, and the air detection joint is communicated with the air hole;
and the air pressure detection unit is arranged on the vent pipe and is used for detecting the air pressure of the vent pipe.
Optionally, the locating pin is the telescopic pin, the telescopic pin includes flexible head and control handle, flexible head with control handle transmission is connected, rotates control handle can make flexible head stretches out or contracts, flexible head sets up on the flat board, control handle is kept away from the flat board sets up.
Optionally, the device further comprises a locating pin air detection unit, wherein the locating pin air detection unit comprises:
the gas sample is provided with a gas channel and a third air hole, the third air hole is communicated with the gas channel, the gas sample is arranged on the vent pipe, and the gas channel is communicated with the vent pipe;
the cover plate, one side of cover plate with the gas sample rotates to be connected, control handle with the cover plate transmission is connected, control handle can drive the cover plate rotates, works as control handle rotates the position when the working position, the cover plate shutoff the third gas pocket, the working position is for control the position that the flexible head stretches out.
Optionally, the cover plate is rotatably connected with the gas sample through a hinge.
Optionally, the air pressure detection unit comprises a pressure sensor and an alarm, and the alarm gives an alarm when the pressure value of the pressure sensor is lower than a pressure threshold value.
Optionally, the air detection joint is communicated with other conveying equipment through an air pipe, and a pressure stabilizing valve is arranged on the air pipe.
Optionally, a pneumatic triple piece is arranged on the gas pipe.
Optionally, the number of the positioning blocks is six, and the six positioning blocks are arranged in two rows and three columns.
Optionally, two positioning pins are provided.
Optionally, the positioning block is connected with the flat plate in a bolt connection manner; and/or
The locating pin is connected with the flat plate in a bolt connection mode.
The beneficial effects of the invention are as follows:
the invention provides a fixture air detection device which comprises at least three positioning blocks, at least two positioning pins, an air detection joint, a plurality of ventilation pipes and an air pressure detection unit. The locating block and the locating pin are arranged on the flat plate of the clamp, when the workpiece to be processed is clamped, the workpiece to be processed is firstly placed on the locating block, then the pressing plate of the clamp is pressed down, the workpiece to be processed is fixed between the pressing plate and the locating block, at the moment, the locating pin is spliced with the locating hole on the workpiece to be processed, and the movement and rotation of the workpiece to be processed in a plane parallel to the flat plate can be limited by arranging at least two locating pins, so that the movement of the workpiece to be processed along the direction perpendicular to the flat plate can be limited by the pressing plate and the locating block. After the gas conveying equipment conveys gas into the vent pipe through the gas detection joint, the gas flows along the vent pipe, the gas pressure detection unit detects the gas pressure of the vent pipe, and whether a gap exists between the first gas hole and the positioning surface of the workpiece to be processed or not can be known through the pressure change of the gas pressure detection unit, so that gas leakage is caused. The fixture air detection device is simple in structure, suitable for universal fixtures, reduces labor intensity of workers, and improves positioning accuracy of workpieces to be processed.
Drawings
FIG. 1 is a schematic structural diagram of a fixture air inspection device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a working process of the locating pin air detection unit and the control handle provided by the invention.
In the figure:
110. a flat plate; 210. a positioning block; 211. a first air hole; 220. a positioning pin; 221. a control handle; 230. an air detection joint; 240. a vent pipe; 251. a gas sample; 2511. a gas channel; 2512. a third air hole; 252. a cover plate; 2521. and a seal.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention provides a fixture air detection device which is applicable to all universal fixtures and improves the positioning precision of a workpiece to be processed.
Specifically, as shown in fig. 1, the fixture air inspection device includes at least three positioning blocks 210, at least two positioning pins 220, an air inspection joint 230, a plurality of ventilation pipes 240, and an air pressure detection unit. The positioning block 210 is disposed on the flat plate 110 of the universal fixture, a first air hole 211 is disposed on an air detection surface of the positioning block 210, a second air hole is disposed on a non-air detection surface of the positioning block 210, the first air hole 211 is communicated with the second air hole, the air detection surface of the positioning block 210 is a plane where the positioning block 210 contacts with a workpiece to be processed, and a plane where the workpiece to be processed contacts with the air detection surface of the positioning block 210 is a positioning surface of the workpiece to be processed. The positioning pins 220 are arranged on the flat plate 110, positioning holes are formed in the workpiece to be processed, the positioning pins 220 are arranged in one-to-one correspondence with the positioning holes, and one positioning pin 220 is inserted into one positioning hole. By providing the positioning pins 220, the workpiece to be processed can be restricted from moving in a plane parallel to the flat plate 110. By providing at least two positioning pins 220, the rotation of the workpiece to be processed can be restricted, and the positioning accuracy of the workpiece to be processed can be ensured. One end of the vent pipe 240 is communicated with the air detection joint 230, the other end is communicated with the second air hole, and a plurality of vent pipes 240 are connected in parallel. The gas conveying device is connected with the gas detection joint 230, conveys gas into the vent pipe 240, and then enters the positioning block 210 from the second air hole along the vent pipe 240, and at the moment, if no sundries such as scrap iron exist between the positioning surface of the workpiece to be processed and the gas detection surface of the positioning block 210, the positioning surface of the workpiece to be processed can block the first air hole 211 on the positioning block 210, and the gas cannot be discharged from the first air hole 211; if the positioning surface of the workpiece to be processed cannot block the first air hole 211 due to impurities between the positioning surface of the workpiece to be processed and the positioning block 210, air leaks from the first air hole 211. The air pressure detection unit (not shown in the figure) is arranged on the air pipe 240 and is used for detecting the air pressure of the air pipe 240, because if air leaks from the first air hole 211, the air pressure of the air pipe 240 is reduced compared with the air pressure of the first air hole 211 of the workpiece to be processed, therefore, an air pressure threshold can be set according to actual requirements, when the air pressure detection unit detects that the air pressure of the air pipe 240 is lower than the air pressure threshold, the positioning surface of the workpiece to be processed on the surface is not tightly attached to the air detection surface of the positioning block 210, the worker is reminded to clamp again, the positioning precision of the workpiece to be processed is guaranteed, and the processing precision of the workpiece to be processed is further guaranteed. Through all setting up the atmospheric pressure detecting element on every breather pipe 240, the staff of being convenient for finds the clamping fast and has the position of problem, saves staff's maintenance time, improves clamping efficiency.
Further, with continued reference to fig. 1, in the present embodiment, six positioning blocks 210 are provided, and the six positioning blocks 210 are arranged in two rows and three columns. Of course, in other embodiments, the number and arrangement of the positioning blocks 210 may be other, and may be set according to actual needs.
Further, with continued reference to fig. 1, in the present embodiment, two positioning pins 220 are provided, and the two positioning pins 220 are disposed in parallel. Of course, in other embodiments, the number and arrangement of the positioning pins 220 may be other, and may be set according to actual needs.
Alternatively, in one embodiment, the positioning block 210 may be connected to the flat plate 110 by a bolting method, which is convenient to disassemble and stable in connection. In another embodiment, the alignment pins 220 may also be bolted to the plate 110. In other embodiments, the positioning block 210 and the positioning pin 220 may be connected to the flat plate 110 by a bolt connection, and may be set according to actual needs.
Preferably, the air pressure detection unit comprises a pressure sensor and an alarm, the pressure sensor is arranged on the vent pipe 240, when the pressure value of the pressure sensor is lower than a pressure threshold value, the controller controls the alarm to give an alarm, prompts workers that clamping is problematic, is convenient for the workers to adjust in time, and improves the clamping efficiency and the positioning precision of workpieces to be processed.
Further, the air detecting joint 230 is communicated with the air conveying device through a conveying pipe (not shown in the figure), and a pressure stabilizing valve is arranged on the air conveying pipe and used for stabilizing the air pressure in the air conveying pipe so as to improve a pressure stabilizing air source for the ventilating pipe 240.
Preferably, the air delivery pipe is also provided with a pneumatic triple piece (not shown in the figure). The pneumatic triple piece consists of an air filter, a pressure reducing valve and an oil mist device. The main function of the air filter is to filter impurities in the compressed air. The main function of the pressure reducing valve is to take charge of the pressure of the gas pipe. The main function of the oil mist device is to take charge of oil lubrication of the rear end element.
Preferably, the positioning pin 220 may be a telescopic pin. The telescopic pin comprises a telescopic head and a control handle 221, the control handle 221 is in transmission connection with the telescopic head, and the telescopic head can be extended or retracted by rotating the control handle 221. When the workpiece to be processed is clamped, the workpiece to be processed and the positioning block 210 are positioned, then the fixed hole is made to be a telescopic head aligned with the telescopic pin, and then the control handle 221 is rotated to realize the plug-in connection of the telescopic head and the positioning hole. After the machining is completed, the machined workpiece needs to be detached from the fixture, at this time, the control handle 221 is turned first to retract the telescopic head, separate from the positioning hole, and then the machined workpiece is taken down. By setting the positioning pin 220 to be a telescopic pin, the damage to the workpiece to be machined caused by the positioning pin 220 in the process of installing the workpiece to be machined and the damage to the machined workpiece caused by the positioning pin 220 in the process of disassembling the machined workpiece can be avoided.
Further, as shown in fig. 2, the fixture air inspection device further includes a locating pin air inspection unit, and the locating pin air inspection unit includes an air inspection body 251 and a cover plate 252. The gas detector 251 is provided with a gas channel 2511 and a third gas hole 2512, the third gas hole 2512 is communicated with the gas channel 2511, and the gas detector 251 is communicated with the vent pipe 240 through the gas channel 2511. One side of the cover plate 252 is rotatably connected with the air detector 251, the control handle 221 is in transmission connection with the cover plate 252, when the control handle 221 rotates to the working position, the cover plate 252 can be enabled to seal the third air hole 2512, air cannot be discharged from the third air hole 2512 at the moment, if the control handle 221 does not rotate to the working position, the cover plate 252 does not seal the third air hole 2512, air leaks from the third air hole 2512, and an alarm arranged on the vent pipe 240 can give an alarm at the moment. By arranging the locating pin gas detection unit, a worker can conveniently judge whether the locating pin 220 is spliced with the locating hole or not, so that the locating precision of a workpiece to be machined is ensured.
Preferably, in order to ensure the blocking effect of the cover plate 252 on the third air hole 2512, a sealing member 2521 may be provided at a position of the third cover plate 252 opposite to the third positioning hole, and the third air hole 2512 may be sealed by the sealing member 2521. The sealing element 2521 can be made of flexible materials, so that the sealing effect is better.
Alternatively, in the present embodiment, the cover plate 252 is rotatably connected to the air detector 251 by a hinge. Of course, in other embodiments, the rotational connection structure between the cover 252 and the air detector 251 may be other, and may be set according to actual needs.
For easy understanding, the working process of the fixture air inspection device will be briefly described:
firstly, a workpiece to be processed with good flatness is selected as a sample, the sample is placed on the positioning block 210, the control handle 221 is rotated to enable the telescopic head to be inserted into the positioning hole, then the pressing plate of the universal fixture is pressed down, and the sample is fixed between the positioning block 210 and the pressing plate. Opening the gas conveying equipment, observing the pressure value of the gas detection unit on each vent pipe 240, and recording the pressure value at the moment when the pressure value of each vent pipe 240 is stable and the pressure value is not great, wherein the pressure value is taken as a pressure threshold value;
and then the sample is taken down, the part to be processed is clamped, and if the air pressure on the air pipe 240 is lower than the pressure threshold value, the alarm gives an alarm to remind the staff to check and re-clamp.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (4)
1. A fixture air inspection device for a universal fixture, the universal fixture comprising a plate (110), the fixture air inspection device comprising:
the three positioning blocks (210) are arranged on the flat plate (110), a first air hole (211) is formed in the air detection surface of each positioning block (210), a second air hole is formed in the non-air detection surface of each positioning block (210), the first air holes (211) are communicated with the second air holes, and the air detection surface of each positioning block (210) is a plane where the positioning blocks (210) are in contact with the positioning surface of a workpiece to be processed;
at least two positioning pins (220) are arranged on the flat plate (110), the positioning surface of the workpiece to be processed is provided with at least two positioning holes, and one positioning pin (220) is spliced with one positioning hole;
the gas detection joint (230) is connected with the gas conveying equipment;
the plurality of vent pipes (240), one end of each vent pipe (240) is communicated with the air detection joint (230), the other end of each vent pipe is communicated with the second air hole, and the plurality of vent pipes (240) are connected in parallel;
the air pressure detection unit is arranged on the vent pipe (240) and is used for detecting the air pressure of the vent pipe (240);
the locating pin (220) is a telescopic pin, the telescopic pin comprises a telescopic head and a control handle (221), the telescopic head is in transmission connection with the control handle (221), the control handle (221) is rotated to enable the telescopic head to extend or retract, the telescopic head is arranged on the flat plate (110), and the control handle (221) is far away from the flat plate (110);
the fixture air inspection device also comprises a locating pin air inspection unit, wherein the locating pin air inspection unit comprises:
a gas sample (251) provided with a gas channel (2511) and a third gas hole (2512), wherein the third gas hole (2512) is communicated with the gas channel (2511), the gas sample (251) is arranged on the vent pipe (240), and the gas channel (2511) is communicated with the vent pipe (240);
the cover plate (252), one side of the cover plate (252) is rotationally connected with the gas sample (251), the control handle (221) is in transmission connection with the cover plate (252), the control handle (221) can drive the cover plate (252) to rotate, when the control handle (221) rotates to a working position, the cover plate (252) seals the third air hole (2512), and the working position is a position for controlling the extension of the telescopic head;
the cover plate (252) is rotatably connected with the gas sample (251) through a hinge;
the air pressure detection unit comprises a pressure sensor and an alarm, and the alarm gives an alarm when the pressure value of the pressure sensor is lower than a pressure threshold value;
the gas detection joint (230) is communicated with the gas conveying equipment through a gas pipe, and a pressure stabilizing valve is arranged on the gas pipe;
the pneumatic triple piece is arranged on the gas pipe;
when the control handle (221) rotates to the working position, the cover plate (252) seals the third air hole (2512), and gas cannot be discharged from the third air hole (2512);
when the control handle (221) is not rotated to the working position, the cover plate (252) does not seal the third air hole (2512), air leaks out of the third air hole (2512), and the alarm arranged on the vent pipe (240) can give an alarm.
2. The fixture air inspection device according to claim 1, wherein six positioning blocks (210) are provided, and six positioning blocks (210) are arranged in two rows and three columns.
3. The fixture air inspection device according to claim 1, wherein two positioning pins (220) are provided.
4. The fixture air inspection device according to claim 1, wherein the positioning block (210) is connected to the flat plate (110) by means of bolting; and/or
The locating pin (220) is connected with the flat plate (110) through a bolt connection mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210815448.3A CN115122153B (en) | 2022-07-08 | 2022-07-08 | Device is examined to anchor clamps gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210815448.3A CN115122153B (en) | 2022-07-08 | 2022-07-08 | Device is examined to anchor clamps gas |
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| CN115122153A CN115122153A (en) | 2022-09-30 |
| CN115122153B true CN115122153B (en) | 2023-10-17 |
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| CN108747583A (en) * | 2018-06-02 | 2018-11-06 | 重庆堰峡智能装备有限公司 | A kind of positioning pin of detectable clamping state |
| CN208556814U (en) * | 2018-07-20 | 2019-03-01 | 上汽通用五菱汽车股份有限公司 | Flexible fixture |
| CN109551301A (en) * | 2018-12-29 | 2019-04-02 | 山东汇金股份有限公司 | A kind of devices and methods therefor of gas source detection workpiece positioning accuracy |
| CN209491579U (en) * | 2018-12-29 | 2019-10-15 | 山东汇金股份有限公司 | A kind of device of gas source detection workpiece positioning accuracy |
| CN210756749U (en) * | 2019-09-12 | 2020-06-16 | 惠州市华阳精机有限公司 | Workpiece clamping detection device |
| CN111283451A (en) * | 2020-04-16 | 2020-06-16 | 无锡贝斯特精机股份有限公司 | Gas detection type elastic pin mechanism |
| CN212645656U (en) * | 2020-08-28 | 2021-03-02 | 嘉兴合祖机电设备有限公司 | Anchor clamps with mechanism is examined to gas |
| CN214869133U (en) * | 2020-12-04 | 2021-11-26 | 广州雅新金属制品有限公司 | Air tightness detection device |
| CN216482871U (en) * | 2021-12-21 | 2022-05-10 | 东莞市瑞衡精密机械有限公司 | A fixture positioning pin detection mechanism |
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