Detection system based on nut loosening and tightening device

Abstract

The utility model relates to the technical field of graphite boats, and particularly provides a detection system based on a tightening nut device, and the detection system comprises a first centering detection mechanism, a take-back detection mechanism, and a control module. The first centering detection mechanism is used for collecting position information of the tail end of the series connection rod. The control module is used for judging whether the series connection rod is centered or not according to the position information fed back by the first centering detection mechanism. The back detection mechanism comprises a correlation end and a receiving end, the correlation end and the receiving end are installed at the end, opposite to the graphite boat, of the support plate and located on the two sides of the pushing mechanism, and a detection line formed by the correlation end and the receiving end intersects with and is perpendicular to the extension line of the axis of the pushing mechanism; the return detection mechanism is used for detecting whether the nut sleeve carries the series connection rod after the return stroke of the linear driving module is completed, and can detect whether the series connection rod is in the middle or not and whether the series connection rod is mistakenly brought back or not.

Description

Technical Field

[0001] This application relates to the field of graphite boat technology, and more particularly to a detection system based on a nut tightening device. Background Technology

[0002] A graphite boat is a carrier used to support photovoltaic cells. It consists of several graphite boat sheets connected in series by connecting rods, with nuts at both ends of the connecting rods for fastening. Graphite boats need to operate in various environments during use. Different graphite boat sheets generate different internal stresses, which cause varying degrees of deformation. Therefore, a calibration machine is needed to calibrate the graphite boat after a period of use.

[0003] The calibration machine is equipped with a nut tightening device to adjust the tightness of the nuts at both ends of the connecting rod, so as to facilitate subsequent calibration of the graphite boat, such as calibrating the boat blade spacing and boat blade verticality.

[0004] During the tightening and loosening of the nut using the nut tightening and loosening device, if the connecting rod is not kept in a centered position, its extension length beyond the graphite boat may be abnormal, such as being too long or too short, thus affecting the tightening effect of the nut. When the connecting rod extends too far, uneven force may cause the nut to be over-tightened, increasing the risk of thread damage or component deformation; while if it extends too short, insufficient effective contact with the nut may result in incomplete tightening, affecting the stability and sealing of the connection. Furthermore, in actual graphite boat calibration operations, connecting rod breakage occasionally occurs. When the nut tightening and loosening device completes the nut tightening and loosening operation, and the linear drive module performs the return stroke, the broken connecting rod remnant can easily be accidentally brought back by the torque output mechanism. Utility Model Content

[0005] To address the aforementioned issues, this application provides a detection system based on a nut tightening device. Through a first central detection mechanism, a pull-back detection and control module, it enables timely detection of issues such as misalignment of the connecting rod and the pulling-back of the connecting rod.

[0006] To achieve the objectives of this application, the following technical solution is provided:

[0007] This application provides a detection system based on a nut tightening / loosening device, the detection system including a first central detection mechanism, a return detection mechanism, and a control module;

[0008] The first centering detection mechanism is used to collect the position information of the end of the connecting rod, and the control module is used to determine whether the connecting rod is centered based on the position information fed back by the first centering detection mechanism.

[0009] The belt return detection mechanism comprises a transmitting end and a receiving end, which are installed at one end of the support plate opposite to the graphite boat and located on both sides of the torque output mechanism, and a detection line formed by the transmitting end and the receiving end intersects and is perpendicular to the extended line of the axis of the pushing mechanism; the belt return detection mechanism is used to detect whether the nut sleeve carries the tandem rod after the linear drive module finishes returning.

[0010] In a possible implementation, the detection system further comprises a second centering detection mechanism, which comprises a sensor and a trigger part;

[0011] The support plate is movably connected with the torque output mechanism through the linear drive module, the pushing mechanism is coaxially penetrated and slidably connected with the torque output mechanism, and the sleeve joint end of the torque output mechanism can be sleeved with and rotate the nut at one end of the tandem rod.

[0012] The trigger part is assembled on the axial movement push rod of the pushing mechanism, the sensor is assembled on the movement path of the trigger part, and when the trigger part contacts the sensor, the control module judges that the tandem rod is not centered.

[0013] In a possible implementation, the control module is in communication connection with the first centering detection mechanism, the second centering detection mechanism and the belt return detection mechanism respectively;

[0014] The control module is used to judge whether the tandem rod is centered according to the position information fed back by the first centering detection mechanism and to alarm when the tandem rod is offset;

[0015] The control module is further used to control the linear drive module and the pushing module to move to correct displacement when the tandem rod is offset, so as to center the tandem rod, make the push rod of the pushing module abut against the end of the tandem rod and make the nut sleeve of the torque output mechanism sleeve the nut at one end of the tandem rod;

[0016] The control module is used to alarm when the second centering detection mechanism is triggered;

[0017] The control module is used to alarm when the belt return detection mechanism is triggered;

[0018] The centering of the tandem rod refers to that the vertical distances of both ends of the tandem rod to the side surfaces of the corresponding graphite boat are within a preset range, and the offset of the tandem rod refers to that the vertical distances of both ends of the tandem rod to the side surfaces of the corresponding graphite boat are not within the preset range.

[0019] The detection system provided by the application comprises a first centering detection mechanism, a belt return detection mechanism and a control. Specifically, the first centering detection mechanism monitors the position of the end of the tandem rod in real time, ensuring that the initial positioning of the tandem rod before the operation of the locknut is accurate. The control module can determine whether the tandem rod is in the centered position according to the position information detected by the first centering detection mechanism, and calculate the deviation data when there is deviation, so as to provide a basis for subsequent compensation control, thereby avoiding operation abnormalities caused by the initial position deviation of the tandem rod from the source. At the same time, the belt return detection mechanism adopts a split optical sensor to set a laser transmission detection area on the return path of the linear drive module. When the broken tandem rod blocks the light path, the belt return detection mechanism is triggered. At the same time, the second centering detection mechanism realizes dynamic monitoring of the centering of the tandem rod through a mechanical trigger design, that is, when the tandem rod deviates during the advancing process of the linear drive module, the push rod of the push mechanism is moved, so that the trigger part on the push rod triggers the sensor, and the first centering detection mechanism forms complementary detection.

[0020] The belt return detection mechanism and the two sets of centering detection systems form a closed-loop control chain: the first centering detection mechanism ensures the starting accuracy, the second centering detection mechanism monitors the process state, and the belt return mechanism guarantees the safety of the end of the locknut operation. Practical application shows that this three-in-one detection system reduces the operation failure rate, ensures the continuous operation of the locknut, and reduces the product failure rate caused by the abnormal position of the tandem rod. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, together with the embodiments of the application, for explaining the application, and do not constitute a limitation on the application;

[0022] Figure 1 The structure schematic diagram of the locknut device provided by the embodiment of the application is shown in the figure;

[0023] Figure 2 The left view of the locknut device provided by the embodiment of the application is shown in the figure; Figure 1 The left view of the locknut device provided by the embodiment of the application is shown in the figure;

[0024] Figure 3 The enlarged schematic diagram of the A area of the locknut device provided by the embodiment of the application is shown in the figure; Figure 1 The enlarged schematic diagram of the A area of the locknut device provided by the embodiment of the application is shown in the figure;

[0025] Figure 4 The structure schematic diagram of the nut sleeve provided by the embodiment of the application is shown in the figure;

[0026] Figure 5 The flowchart of the tandem rod centering regulation method based on the calibrated graphite boat provided by the embodiment of the application is shown in the figure;

[0027] Figure 6 The flowchart of another tandem rod centering regulation method based on the calibrated graphite boat provided by the embodiment of the application is shown in the figure;

[0028] Figure 7 A flow chart of another method for regulating the centering of a series of rods based on a calibrated graphite boat is provided for the embodiments of the present application.

[0029] Illustration: 1, support plate; 2, linear drive module; 3, torque output mechanism; 31, rotary drive assembly; 311, rotary motor; 312, guide sleeve; 313, guide shaft; 32, nut sleeve; 321, sleeve; 322, inner sleeve end; 3221, first clamping layer; 3222, second clamping layer; 323, outer sleeve end; 3231, third clamping layer; 3232, fourth clamping layer; 33, housing; 4, pushing mechanism; 41, pushing module; 42, push rod; 5, first centering detection mechanism; 6, belt return detection mechanism; 61, emitting end; 62, receiving end; 7, second centering detection mechanism; 71, sensor; 72, trigger part. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] The terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0033] Figure 1 A mechanism schematic diagram of the loose and tight nut device provided for the embodiments of the present application is shown in the figure; Figure 2 A left view of Figure 1 A left view of Figure 3 A left view ofFigure 1 Enlarged view of region A in the middle; Figure 4 This is a schematic diagram of the structure of the nut sleeve provided in the embodiments of this application; Figure 5 A flowchart illustrating the cascade rod centering control method based on a calibrated graphite boat provided in this application embodiment; Figure 6 A flowchart illustrating another method for centering and adjusting a series rod based on a calibrated graphite boat, provided in this application embodiment; Figure 7 A flowchart illustrating another method for centering and adjusting a series rod based on a calibrated graphite boat, provided in this application embodiment, is shown below. Figures 1 to 7 The following embodiments illustrate the technical solutions of this application.

[0034] like Figures 1-4 As shown in the figure, this application provides a nut tightening and loosening device, including: a bracket plate 1, a linear drive module 2, a torque output mechanism 3, and a pushing mechanism 4.

[0035] The support plate 1 is connected to the linear drive module 2, and the linear drive module 2 is movably connected to the torque output mechanism 3. Specifically, the side of the support plate 1 is fixedly connected to the linear drive module 2, and the movable end of the linear drive module 2 is connected to the rotary drive assembly 31 of the torque output mechanism 3.

[0036] The torque output mechanism 3 includes a rotary drive assembly 31 and a nut sleeve 32. The rotary drive assembly 31 is connected to the nut sleeve 32 in a transmission manner. The rotary drive assembly 31 is used to drive the nut sleeve 32 to rotate. The sleeve end of the nut sleeve 32 is used to sleeve the nut at one end of the connecting rod.

[0037] The pushing mechanism 4 includes a pushing module 41 and a push rod 42. The nut sleeve 32, the drive rotation assembly and the pushing module 41 are coaxially arranged. The nut sleeve 32 and the rotation drive assembly 31 are provided with a coaxial channel. The push rod 42 is movably sleeved in the channel. The first end of the push rod 42 is connected to the pushing module 41 and the second end of the push rod 42 is used to abut against the end of the connecting rod.

[0038] The linear drive module 2 is exemplified by a linear motor, an electric actuator, an electric cylinder, or a combination of a lead screw and a rotary motor. The push module 41 is exemplified by a combination of a cylinder, a lead screw, and a rotary motor. The push module 41 and the push rod 42 can be coaxially arranged at a preset distance, with the movable end of the push rod 42 module movably connected to the first end of the push rod 42. Alternatively, the push module 41 and the push rod 42 can be coaxially arranged without any distance, and the movable end of the push module 41 can be fixedly connected to the push rod 42.

[0039] The tightening nut device provided by the embodiment is used to loosen and tighten the tightening nuts at the two ends of the tandem rod. The operation is as follows: the movable end of the pushing module 41 is extended and connected with the first end of the pushing rod 42, the linear driving module 2 drives the torque output mechanism 3 and the pushing mechanism 4 to move towards the graphite boat, until the pushing module 41 drives the second end of the pushing rod 42 to abut against the end of the tandem rod, and the linear driving module 2 drives the nut sleeve 32 to sleeve the nut at one end of the tandem rod; then, the rotating driving assembly 31 rotates to drive the nut sleeve 32 to rotate the nut at one end of the tandem rod. The end of the tandem rod is abutted against by the pushing mechanism 4, so that the tandem rod is axially positioned, and the synchronous rotation of the tandem rod is effectively inhibited when the nut is rotated, and the nut loosening and tightening efficiency is effectively improved.

[0040] In some embodiments, the rotating driving assembly 31 comprises a rotating motor 311, a driving wheel, a driven wheel, a belt, a guide sleeve 312 and a guide shaft 313, specifically:

[0041] The output end of the rotating motor 311 is rotationally connected with the driving wheel, the driving wheel is drivingly connected with the driven wheel through the belt, the driven wheel is specifically sleeved with the first end of the guide sleeve 312 on the inner wall of the driven wheel, the second end of the guide sleeve 312 is specifically sleeved with the first end of the guide shaft 313 on the inner wall of the second end of the guide sleeve 312, the second end of the guide shaft 313 is sleeved with the nut sleeve 32, the guide sleeve 312, the guide shaft 313 and the nut sleeve 32 are internally provided with coaxial channels, and the pushing rod 42 is movably sleeved in the channels.

[0042] The rotating driving assembly 31 further comprises a housing 33, the housing 33 is internally provided with a cavity, the cavity is internally provided with the rotating motor 311, the driving wheel, the driven wheel and the belt, two opposite sides of the housing 33 are provided with two opposite through holes, the two through holes coincide with the central axis of the driven wheel and are both provided with bearings, the second end of the pushing rod 42 sequentially penetrates through the bearing in one of the through holes of the housing 33, the channel of the driven wheel, the channel of the guide sleeve 312, the channel of the guide shaft 313 and the channel of the nut sleeve 32, and the bearing in the other through hole of the housing 33 is sleeved with the guide sleeve 312. In addition, the upper bottom surface of the housing 33 is connected with the movable end of the linear driving module 2.

[0043] It should be noted that the rotating driving assembly 31 drives the nut sleeve 32 to rotate in the following manner: the rotating motor 311 drives the driving wheel to rotate, the driven wheel rotates under the transmission of the belt, the guide sleeve 312 and the guide shaft 313 connected with the driven wheel are synchronously driven to rotate, and the nut sleeve 32 connected with the guide shaft 313 is synchronously driven to rotate, while the pushing rod 42 sleeved in the channels does not rotate, and the pushing rod 42 only moves linearly towards or away from the graphite boat under the pushing of the pushing module 41 or the tandem rod.

[0044] On the basis of the above embodiments, a boat calibrating machine is also provided, which comprises a loose nut device and a three-axis linear motion mechanism; the three-axis linear motion mechanism is arranged oppositely and at intervals; the three-axis linear motion mechanism is connected with the loose nut device, and is used to drive the loose nut device to move in XYZ three-axis directions; the loose nut device is used to adjust the tightness of the nuts at both ends of the tandem rod.

[0045] The loose nut device provided in the embodiment achieves efficient loose and tight operation of the nuts of the tandem rod through the cooperation of the pushing mechanism 4 and the torque output mechanism 3. Specifically, through the connection of the movable end of the pushing module 41 and the first end of the push rod 42, the synchronous movement of the torque output mechanism 3 and the pushing mechanism 4 driven by the linear driving module 2 is matched, so that the second end of the push rod 42 accurately abuts against the end of the tandem rod, and at the same time, the nut sleeve 32 accurately sleeves the nut at the end of the tandem rod, torque balance is achieved between the axial positioning of the pushing mechanism 4 to the end of the tandem rod and the rotating action of the nut sleeve 32, and the problem of following rotation of the tandem rod when the nuts are loosened or tightened is effectively inhibited. This double-acting mechanism improves the efficiency of nut loosening and tightening, and avoids damage to the threads of the tandem rod or the nuts caused by rotation of the tandem rod.

[0046] In some embodiments, in order to match nuts of different diameter specifications, a loose nut device is also provided, which is based on the features described in the above embodiments, and the nut sleeve 32 is provided as a synchronous variable-diameter sleeve of a clamping layer. The synchronous variable-diameter sleeve of the clamping layer comprises a movable inner sleeve end connected with a rotating driving assembly and a movable outer sleeve end sleeved with the inner sleeve end, so that the inner wall of the inner sleeve end is adapted to sleeve the outer wall of a type of nut, the outer wall of the outer sleeve end is adapted to sleeve the inner wall of another type of nut, and the inner wall of the outer sleeve end is adapted to sleeve the outer wall of another type of nut.

[0047] Specifically, as shown in Figure 4 The synchronous variable-diameter sleeve of the clamping layer comprises a sleeve 321, an inner sleeve end 322, an outer sleeve end 323, and a first spring. The outer sleeve end 323 and the movable inner sleeve end 322 are connected to the end of the sleeve 321 away from the rotating driving assembly 31 along the axial direction of the sleeve 321. The inner sleeve end 322 is connected to the first spring at the end close to the sleeve 321, and the other end of the first spring is connected to the inner wall of the sleeve 321.

[0048] The second end of the push rod 42 of the pushing mechanism 4 is coaxially connected to the rotating driving assembly 31, the first spring, the sleeve 321, and the inner sleeve end 322 in sequence.

[0049] The synchronous variable-diameter sleeve of the opposite clamping layer of the embodiment can be applied to nuts of various specifications. Specifically, the outer sleeve end 323 is sleeved with the inner wall of a first type of nut and can loosen or tighten the nut, the inner sleeve end 322 is sleeved with the outer wall of a second type of nut and can loosen or tighten the nut, and the inner wall of the outer sleeve end 323 is sleeved with the outer wall of a third type of nut and can loosen or tighten the nut. The outer diameter of the third type of nut is smaller than the inner diameter of the outer sleeve end and larger than the inner diameter of the inner sleeve end.

[0050] It should be noted that the inner wall of the outer sleeve end 323 is sleeved with the outer wall of the third type of nut in the following way: the end face of the inner sleeve end 322 is pressed by the third type of nut towards the sleeve 321, the first spring is contracted to drive the inner sleeve end 322 to move towards the sleeve 321 until the inner wall of the outer sleeve end 323 is sleeved with the outer wall of the third type of nut.

[0051] Moreover, the embodiment further has a groove passing through the channel at one end of the sleeve 321, and the end of the inner sleeve end 322 connected with the sleeve 321 is matched with the size of the groove and is nested in the groove. In this way, the inner sleeve end 322 can move axially along the groove when pressed, and the inner sleeve end 322 can be prevented from being deflected circumferentially by the cooperation between the inner sleeve end 322 and the groove, so as to realize torque transmission.

[0052] In some embodiments, as shown in Figure 4 the inner sleeve end 322 includes a base and first and second clamping layers 3221 and 3222 extending axially along the base, the base is nested in the groove at one end of the sleeve 321, the outer sleeve end 323 includes third and fourth clamping layers 3231 and 3232 extending axially along the sleeve 321, the first clamping layer and the third clamping layer 3231 form a first layer-stacking cooperation surface in the radial direction of the sleeve 321, the second clamping layer 3222 and the fourth clamping layer form a second layer-stacking cooperation surface in the radial direction of the sleeve 321, and the two groups of layer-stacking cooperation surfaces are symmetrically distributed along the axis of the sleeve 321. The base can be connected with one end of the first spring.

[0053] It should be noted that the outer wall of the relative third clamping layer 3231 and the fourth clamping layer 3232 is sleeved with the inner wall of the first type of nut and can be tightened or loosened, the clamping space formed by the relative first clamping layer 3221 and the second clamping layer 3222 is sleeved with the outer wall of the second type of nut and can be tightened or loosened, and the clamping space formed by the relative third clamping layer 3231 and the fourth clamping layer 3232 is sleeved with the outer wall of the third type of nut and can be tightened or loosened. The first clamping layer 3221 and the second clamping layer 3222 are planar structures, the inner side of the third clamping layer 3231 and the fourth clamping layer 3232 close to the inner sleeve end 322 is a plane with the same size as the first clamping layer 3221 and the second clamping layer 3222, and the outer side of the third clamping layer 3231 and the fourth clamping layer is a curved surface that can match the inner wall of the first type of nut.

[0054] In some embodiments, a torque output mechanism 3 is also provided, and the torque output mechanism 3 further comprises a second spring, one end of the second spring is connected to the rotation driving assembly 31 and the other end of the second spring is connected to one end of the nut sleeve 32 away from the sleeve end, and the second end of the push rod 42 is sequentially penetrated and slidably connected to the rotation driving assembly 31, the second spring and the nut sleeve 32. For example, one end of the nut sleeve 32 is connected to one end of the second spring, and the other end of the second spring is sleeved in the guide shaft 313, which can reduce the stress when the nut sleeve 32 rotates the nut, and avoid damage to the surface of the nut.

[0055] In some embodiments, a torque output mechanism 3 is also provided, and the torque output mechanism 3 further comprises a second spring, a piezoelectric module and a control module; one end of the second spring close to the rotation driving assembly 31 is connected with the piezoelectric module.

[0056] The piezoelectric module in this embodiment is a piezoelectric ceramic driving module, which is a device commonly used to control and adjust small mechanical movements. Its function is to cause the piezoelectric ceramic material to deform by changing the electric field, thereby producing mechanical displacement. In practical applications, piezoelectric ceramics are usually designed in the form of a thin sheet, and the application of voltage causes the bending or stretching movement of the sheet, which in turn drives the connected load to move.

[0057] It should be noted that the control module is also provided in this embodiment, and the control module releases a corresponding current stimulus to the piezoelectric module according to the depth data of the nut, so that the piezoelectric module deforms. This deformation can cause the second spring to deform, i.e. adjust the pre-tightening force of the second spring, so that the torque output mechanism 3 adapts to nuts of different depths.

[0058] Meanwhile, in order to obtain the depth information of the nut in real time, the embodiment further comprises a first centering detection mechanism 5 in communication connection with the control module, which is used to detect the depth of the nut when the nut is aligned and feed back the depth information to the control module. The first centering detection mechanism 5 can be installed on the side of the support plate 1 opposite to the linear drive module 2, or on the two opposite sides of the support plate 1 or the front end surface of the support plate, or on other movable supports as long as the detection light of the first centering detection mechanism 5 is not blocked and the nut area of the graphite boat can be effectively captured.

[0059] For example, the first centering detection mechanism 5 comprises a laser range finder. Before collecting the position information of the end of the tandem rod or the depth of the nut, the detection light of the first centering detection mechanism 5 needs to be opposite to the tandem rod and the nut and coincide with the axis of the tandem rod.

[0060] On the basis of the above embodiment, a boat calibrating machine is further provided, which comprises a slack nut device and a three-axis linear motion mechanism; the three-axis linear motion mechanisms are oppositely and spacedly arranged; the three-axis linear motion mechanisms are connected with the slack nut device and used to drive the slack nut device to move in the XYZ three-axis direction; the slack nut device is used to adjust the tightness of the nuts at the two ends of the tandem rod, and can also be used for nuts of different diameter specifications and different depth specifications.

[0061] The slack nut device described in the embodiment can fix the tandem rod and rotate the nut at the same time, and also realizes the rapid adaptation and reliable clamping of nuts of different diameters and depths through the synchronous variable-diameter sleeve structure of the opposite clamping layer and the built-in second spring-piezoelectric module. The inner sleeve joint end 322 of the slack nut device realizes elastic sleeving through the first spring, and the outer sleeve joint end 323 nests the inner sleeve joint end 322 to form a composite structure, which can automatically switch the sleeving mode according to the inner diameter or outer diameter size of the nut; at the same time, the intelligent adjustment system integrated with the second spring-piezoelectric module accurately matches nuts of different depths by pre-controlling the pre-tightening force of the second spring. This double self-adaptive mechanism enables the slack nut device to be compatible with nuts of a wide range of diameters and a wide range of depths, while effectively avoiding damage to the surface of the nut while ensuring stable clamping force. Moreover, the overall structure meets the multifunctional requirements while maintaining compactness, which is suitable for nut assembly operations on automatic production lines and slack nut operations based on graphite boat calibration.

[0062] In actual graphite boat calibration operation, if the tandem rod is not kept in the center position, it may cause the length of the tandem rod to be abnormally long or short, thereby affecting the fastening effect of the nut. When the tandem rod is too long, it may cause the nut to be over-tightened due to uneven force, increasing the risk of thread damage or component deformation; and when the tandem rod is too short, it may not be tightly screwed due to insufficient effective contact with the nut, affecting the stability and sealing of the connection, so it is necessary to detect whether the tandem rod is centered to intervene or adjust the tandem rod in time. Therefore, in some embodiments, a detection system based on the above embodiments of the loose nut device is also provided, which comprises a first centering detection mechanism 5 and a control module. The first centering detection mechanism 5 is used to collect the position information of the end of the tandem rod, and the control module is used to determine whether the tandem rod is centered according to the position information fed back by the first centering detection mechanism 5.

[0063] Wherein the centering of the tandem rod means that the vertical distance between the two ends of the tandem rod to the corresponding side of the graphite boat is within a predetermined range, and the offset of the tandem rod means that the vertical distance between the two ends of the tandem rod to the corresponding side of the graphite boat is not within the predetermined range. For example, the first centering detection mechanism 5 can be installed on the side of the support plate 1 opposite the linear drive module 2. The first centering detection mechanism 5 comprises a laser range finder, and before collecting the position information of the end of the tandem rod, the detection light of the first centering detection mechanism 5 needs to be opposite to the tandem rod and coincide with the axis of the tandem rod.

[0064] In actual graphite boat calibration operation, the tandem rod may occasionally break. When the loose nut device completes the nut loosening / tightening operation, the broken residual part of the tandem rod is easily brought back by the torque output mechanism 3 by accident. In view of this situation, the detection system is provided with a back detection mechanism 6, as shown in Figure 2 The back detection mechanism 6 comprises a transmitting end 61 and a receiving end 62, and the transmitting end 61 and the receiving end 62 are installed on the side of the support plate 1 opposite the graphite boat and located on both sides of the torque output mechanism 3. The detection line formed by the transmitting end 61 and the receiving end 62 intersects and is perpendicular to the axis extension line of the pushing mechanism 4; the back detection mechanism 6 is used to detect whether the nut sleeve 32 carries the tandem rod after the linear drive module 2 completes the return stroke.

[0065] The back detection mechanism 6 detects whether the loose nut device carries the tandem rod in the following way: when the linear drive module 2 completes the return stroke, if the broken residual part of the tandem rod blocks the light transmission between the transmitting end 61 and the receiving end 62, the back detection mechanism 6 is triggered, and the control module can issue an alarm and start a safety protection program. The back detection mechanism 6 is an example of a split optical sensor.

[0066] In some embodiments, a detection mechanism, i.e., a second centering detection mechanism 7, is also provided for detecting whether the tandem rod is centered. In order to cooperate with the second centering detection mechanism 7, it is necessary to ensure that the push module 41 of the pushing mechanism 4 is spaced apart from the first end of the push rod 42 by a predetermined distance, so that the push module 41 and the second end of the push rod 42 should be coaxially arranged at a predetermined distance, and the movable end of the push module 41 is movably connected to the first end of the push rod 42. Specifically, as shown in Figure 3 the second centering detection mechanism 7 includes a sensor 71 and a trigger portion 72. The trigger portion 72 is mounted on the axially movable push rod 42 of the pushing mechanism 4, and the sensor 71 is mounted on the movement path of the trigger portion 72. When the trigger portion 72 contacts the sensor 71, the control module determines that the tandem rod is offset.

[0067] The second centering detection mechanism 7 detects whether the tandem rod is centered in the following way: during the movement of the linear drive module 2, the torque output mechanism 3 and the pushing mechanism 4 towards the graphite boat nut, if the tandem rod is in abutment with the push rod 42 of the pushing mechanism 4 and pushes the push rod to move away from the graphite boat nut, until the trigger portion 72 on the push rod 42 triggers the sensor 71, then the tandem rod is offset. Exemplarily, the sensor 71 of the second centering detection mechanism 7 is a slot photoelectric sensor 71, and the trigger portion 72 is a sensing sheet matched with the width of the slot photoelectric slot.

[0068] In some embodiments, the first centering detection mechanism 5 and the second centering detection mechanism 7 are redundantly arranged in the tension nut device, which effectively detects whether the tandem rod is centered, and avoids the occurrence of adverse conditions (such as insufficient tightening, over-tightening, etc.) during the nut locking process due to the problem that the offset of the tandem rod cannot be discovered in time.

[0069] In some embodiments, the control module is communicatively connected with the first centering detection mechanism 5, the second centering detection mechanism 7 and the belt back detection mechanism 6. The control module is used to determine whether the tandem rod is centered according to the position information fed back by the first centering detection mechanism 5 and to alarm when the tandem rod is offset; is also used to control the linear drive module 2 and the push module 41 to move to correct the displacement when the tandem rod is offset, so that the tandem rod is centered, the push rod 42 of the push module 41 abuts against the end of the tandem rod, and the nut sleeve 32 of the torque output mechanism 3 sleeves the nut at one end of the tandem rod; is also used to drive the rotary drive assembly 31 to rotate to drive the nut sleeve 32 to rotate the nut at one end of the tandem rod; is also used to alarm when the second centering detection mechanism 7 is triggered; and is also used to alarm when the belt back detection mechanism 6 is triggered.

[0070] In some embodiments, the loose nut device further comprises a three-axis linear motion mechanism connected with the loose nut device, and the three-axis linear motion mechanism is used to drive the loose nut device to move in three-axis directions. For example, when the first centering detection mechanism 5 is installed on the support plate 1, the three-axis linear motion mechanism is driven to move close to the graphite boat until the first centering detection mechanism 5 is aligned with the tandem rod and the nut. After the first centering detection mechanism 5 collects relevant data, the three-axis linear motion mechanism is driven to move the loose nut device close to the graphite boat until the loose nut device is aligned with the tandem rod and the nut.

[0071] The three detection mechanisms described in the present embodiment achieve precise control of the tandem rod in all directions. The first centering detection mechanism 5 monitors the position of the end of the tandem rod in real time, ensuring that the initial positioning of the tandem rod before the loose nut operation is accurate. The control module can determine whether the tandem rod is in the centered position according to the position information detected by the first centering detection mechanism 5, and calculate the deviation data when there is a deviation to provide a basis for subsequent compensation control, thereby avoiding abnormal loose nut operation caused by the initial position deviation of the tandem rod from the source. The second centering detection mechanism 7 achieves dynamic monitoring of the centering of the tandem rod through a mechanical trigger design. When the tandem rod deviates during the advancement of the linear drive module 2, it will push the push rod 42 of the push mechanism 4 to move, causing the trigger part 72 on the push rod 42 to trigger the sensor 71, and forming complementary detection with the first centering detection mechanism 5. The take-back detection mechanism 6 uses a split optical sensor 71 to set a laser transmission detection area on the return path of the linear drive module 2. When the broken tandem rod residue blocks the light path, the take-back detection mechanism 6 is triggered. The take-back detection mechanism 6 forms a closed-loop control chain with the two aforementioned detection systems: the first centering detection mechanism 5 ensures the starting accuracy, the second centering detection mechanism 7 monitors the process state, and the take-back mechanism guarantees the safety of the end. Practical application shows that this three-in-one detection system reduces the failure rate, ensures the continuous operation of the loose nut operation, and reduces the product failure rate caused by abnormal position of the tandem rod.

[0072] In some embodiments, based on the above loose nut device and control system, the present embodiment further provides a tandem rod centering regulation method based on a calibrated graphite boat, as shown in Figure 5 The method comprises:

[0073] S510 detects the position information of the end of the tandem rod through the first centering detection mechanism 5;

[0074] S520 the control module receives the position information and determines whether there is a deviation between the position information and the preset position information;

[0075] S530, when the deviation exists between the position information and the preset position information and the deviation value is in the first preset deviation range, driving the movable end of the linear driving module 2 and the push module 41 to move in the direction of approaching the graphite boat by the first correction displacement and the second reference displacement respectively, so as to center the tandem rod, make the push rod 42 of the push module 41 abut against the end of the tandem rod, and make the nut sleeve 32 of the torque output mechanism 3 sleeve the nut at one end of the tandem rod;

[0076] S540, the control module drives the rotation driving assembly 31 of the torque output mechanism 3 to rotate, so as to drive the nut sleeve 32 to rotate the nut at one end of the tandem rod.

[0077] In some embodiments, on the basis of the above loose nut device and control system, this embodiment also provides another tandem rod centering regulation method based on calibrating the graphite boat, as shown in Figure 6 The method comprises:

[0078] S610, detecting the position information of the end of the tandem rod by the first centering detection mechanism 5;

[0079] S620, the control module receives the position information and judges whether there is a deviation between the position information and the preset position information;

[0080] S630, when the deviation exists between the position information and the preset position information and the deviation value is in the second preset deviation range, driving the movable end of the linear driving module 2 and the push module 41 to move in the direction of approaching the graphite boat by the first correction displacement and the second reference displacement respectively, so as to center the tandem rod, make the push rod 42 of the push module 41 abut against the end of the tandem rod, and make the nut sleeve 32 of the torque output mechanism 3 sleeve the nut at one end of the tandem rod;

[0081] S640, the control module drives the rotation driving assembly 31 of the torque output mechanism 3 to rotate, so as to drive the nut sleeve 32 to rotate the nut at one end of the tandem rod.

[0082] Wherein, the centering of the tandem rod means that the vertical distance between the two ends of the tandem rod to the corresponding side of the graphite boat is in the preset range, the preset position information means the position information of the end of the tandem rod when the tandem rod is centered, the second reference displacement is determined according to the distance between the end of the push rod 42 close to the push module 41 and the push module 41 when the push module 41 is in the initial state, the first correction displacement is the sum of the first reference displacement and the deviation value, and the minimum value of the second preset deviation range is greater than the maximum value of the first preset deviation range.

[0083] In some embodiments, on the basis of the above loose nut device and control system, this embodiment also provides another tandem rod centering regulation method based on calibrating the graphite boat, as shown in Figure 7 The method comprises:

[0084] S710 detecting position information of the end of the tandem rod by the first centering detection mechanism 5;

[0085] S720 receiving the position information by the control module, and determining whether there is a deviation between the position information and preset position information;

[0086] S730 when there is a deviation between the position information and the preset position information and the deviation value is in the third preset deviation range, driving the linear drive module 2 and the movable end of the push module 41 to move in the direction close to the graphite boat by a first reference displacement and a second reference displacement, so as to center the tandem rod, the push rod 42 of the push module 41 abuts against the end of the tandem rod, and the nut sleeve 32 of the torque output mechanism 3 sleeves the nut at one end of the tandem rod.

[0087] S740 driving the rotary drive assembly 31 of the torque output mechanism 3 to rotate, so as to drive the nut sleeve 32 to rotate the nut at one end of the tandem rod.

[0088] In the above embodiment, the centering of the tandem rod means that the vertical distance between the two ends of the tandem rod to the corresponding side of the graphite boat is within a preset range, and the preset position information refers to the position information of the end of the tandem rod when the tandem rod is centered. The position information is obtained by laser calibration and stored in the control module. The position information can be the coordinates of the end of the tandem rod or the distance between the end of the tandem rod and the first centering detection mechanism.

[0089] The first reference displacement is determined according to the distance between the end of the tandem rod and the sleeving end when the tandem rod is centered and the linear drive module 2 is in the initial state. The second reference displacement is determined according to the distance between the end of the push rod 42 close to one end of the push module 41 and the push module 41 and the distance between the end of the push rod 42 close to the graphite boat and the end of the tandem rod when the push module 41 is in the initial state. The first correction displacement is the sum of the first reference displacement and the deviation value, and the second correction displacement is the sum of the second reference displacement and the deviation value.

[0090] The deviation value is the difference between the position information of the end of the tandem rod detected by the first detection mechanism and the preset position range. When the preset deviation range is required, the minimum value of the first preset deviation range should be greater than the maximum value of the second preset deviation range, and the minimum value of the second preset deviation range should be greater than the maximum value of the third preset deviation range.

[0091] The initial state in the present application covers two positioning references of the linear drive module 2 and the linear drive module 2: either the absolute zero position state of the module or the preset process starting position (i.e. the state of the moving end of the module being a specific distance from the zero position). Regardless of the reference definition, the core constraint condition needs to be met: when the linear drive module 2 and the pushing module 41 cooperatively enter the initial state (i.e. the overall reset of the tension nut device), the front end of the nut sleeve 32 of the torque output mechanism 3 and the second end of the push rod 42 of the pushing module 41 must be strictly limited within the space range behind the front end face of the support plate 1. In particular, the determination criterion of "returning to the end" in the present application refers to the synchronous return of the linear drive module 2 and the pushing module 41 to the initial state (i.e. the overall reset of the tension nut device), and the spatial orientation of the front end face of the support plate 1 is always parallel to and opposite to the graphite boat installation reference surface.

[0092] The embodiment can detect the position state of the tandem rod in real time based on the tandem rod centering regulation method based on the calibrated graphite boat, and perform displacement compensation according to the detection result. Specifically, when it is detected that the tandem rod is offset, a compensation mechanism is automatically selected according to the offset amount: for a large offset (i.e. the deviation exceeds the third preset deviation range and is within the first preset deviation range) exceeding the threshold, a linear drive module with a larger stroke range superimposes a compensation displacement on the reference displacement; for a small offset (i.e. the deviation value exceeds the third preset deviation range and is within the second preset deviation range) exceeding the threshold, a pushing module with higher precision performs fine adjustment compensation; when the tandem rod is in the centered state (i.e. the deviation value is within the third preset deviation range), the linear drive module and the pushing module synchronously perform the preset reference displacement. The hierarchical control strategy reasonably allocates the compensation tasks of the two modules, which not only ensures the rapid response capability to large offsets, but also realizes high-precision correction to small deviations, thereby significantly improving the comprehensive performance of the centering control.

[0093] In some embodiments, a boat calibrating machine is also provided, which comprises the tension nut device and the three-axis linear motion mechanism as described in the above embodiments; the three-axis linear motion mechanisms are oppositely and spacedly arranged, and the spacing distance is determined according to the graphite boat placement station; the three-axis linear motion mechanisms are connected with the tension nut device and used to drive the tension nut device to move in the XYZ three-axis direction. The boat calibrating machine simultaneously tightens and loosens the nuts on both sides of the tandem rod through the tension nut device and the above tandem rod centering regulation method.

[0094] The application embodiment can achieve the beneficial effects: by integrating the mechanical structure and the detection control system, the high-precision, high-adaptability full-automatic operation of the series connection rod nut tightness operation is realized. Specifically, at the mechanical execution level, the push mechanism and the torque output mechanism constitute a bidirectional positioning system, the former realizes the axial fixation of the series connection rod through the driven push rod, and the latter can automatically adapt to the diameter difference and thread depth change of the nut of various specifications by means of the synchronous variable diameter sleeve structure of the opposite clamping layer and the composite adjustment mechanism of the second spring-piezoelectric module, and ensure that the clamping force is stable within the process requirement range; at the detection control level, the first centering detection mechanism (such as a laser displacement sensor) and the second centering detection mechanism (such as a mechanical trigger photoelectric switch) can real-time feedback the spatial state data of the series connection rod, and the take-back detection mechanism (such as an infrared laser transmission sensor) can detect the broken rod take-back, and the three kinds of detection mechanisms jointly constitute a three-level monitoring network, and the PID algorithm of the control module dynamically adjusts the compensation displacement of the linear drive module and the push module, so as to center the series connection rod. The integrated system greatly improves the success rate of the nut tightness operation and simultaneously meets the mixed line calibration requirements of different types of graphite boats, and solves the three technical problems of series connection rod positioning deviation, nut damage and broken rod residue in the traditional process.

[0095] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it. The present application is not limited to the exact structure described above and shown in the drawings, and the specific implementation of the present application cannot be limited to the above description. For ordinary skilled in the art to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be considered to fall within the scope of protection of the present application.

Claims

1. A detection system based on a nut tightening / loosening device, characterized in that, The detection system includes a first central detection mechanism, a return detection mechanism, and a control module; The first centering detection mechanism is used to collect the position information of the end of the connecting rod, and the control module is used to determine whether the connecting rod is centered based on the position information fed back by the first centering detection mechanism. The return detection mechanism includes a photoelectric end and a receiving end, which are installed on the support plate at one end opposite to the graphite boat and on both sides of the torque output mechanism. The detection line formed by the photoelectric end and the receiving end intersects and is perpendicular to the extension line of the axial line of the pushing mechanism. The return detection mechanism is used to detect whether the nut sleeve carries the connecting rod after the linear drive module has completed its return stroke.

2. The detection system based on a nut tightening / loosening device according to claim 1, characterized in that, The detection system also includes a second central detection mechanism, which includes a sensor and a trigger unit; The support plate is movably connected to the torque output mechanism via a linear drive module. The pushing mechanism is coaxially connected to and slidably connected to the torque output mechanism. The sleeve end of the torque output mechanism can be sleeved onto and rotated onto the nut at one end of the connecting rod. The trigger part is mounted on the axially moving push rod of the jacking mechanism, and the sensor is mounted on the movement path of the trigger part. When the trigger part contacts the sensor, the control module determines that the connecting rod is not centered.

3. The detection system based on a nut tightening / loosening device according to claim 2, characterized in that, The control module is communicatively connected to the first central detection mechanism, the second central detection mechanism, and the return detection mechanism, respectively. The control module is used to determine whether the connecting rod is centered based on the position information fed back by the first centering detection mechanism and to issue an alarm when the connecting rod deviates. The control module is also used to control the linear drive module and the push module to move and correct the displacement when the series rod is offset, so as to center the series rod, make the push rod of the push module abut against the end of the series rod, and make the nut sleeve of the torque output mechanism fit into the nut at one end of the series rod. The control module is used to trigger an alarm when the second central detection mechanism is activated; The control module is used to issue an alarm when the return detection mechanism is triggered. The term "centralized" means that the vertical distance from both ends of the series rod to the corresponding side of the graphite boat is within a preset range; the term "offset" means that the vertical distance from both ends of the series rod to the corresponding side of the graphite boat is not within the preset range.

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