Automatic calibration equipment of magnetostrictive liquid level meter

Abstract

The utility model discloses an automatic calibration device of a magnetostrictive liquid level meter, which comprises a pair of limiting seats arranged on a calibration table top at intervals along a first direction and matched with a clamping guide rod, and one or two of the pair of limiting seats can be arranged in a sliding manner along the first direction; the floating ball fixing unit is arranged on one or two limiting seats, the floating ball fixing unit comprises a pressing end used for making contact with the floating ball, and the floating ball fixing unit is used for pressing and limiting the floating ball to the end of the guide rod; the displacement driving unit is arranged on the calibration table top, and the displacement driving unit is used for clamping and controlling the floating ball to slide along the guide rod; the position sensor is used for detecting the position of the floating ball; and the signal acquisition unit is used for detecting the calibration current of the magnetostrictive liquid level meter. According to the automatic calibration equipment of the magnetostrictive liquid level meter, automatic calibration of the liquid level meter can be achieved, the accuracy of the calibration position is guaranteed, meanwhile, the influence of craters at the end of the guide rod on the calibration position is avoided, and the high-precision measurement requirement can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of magnetostriction liquid level meter, and specifically relates to an automatic calibration equipment of magnetostriction liquid level meter. BACKGROUND

[0002] The magnetostriction liquid level meter is a high-precision sensor for measuring the position of liquid or solid material by using the magnetostriction principle, and its working principle is to determine the position of the float ball by the torsional wave generated by the encounter of the magnetic field of the magnetostriction waveguide and the permanent magnet of the float ball, so as to calculate the material position.

[0003] The calibration of the magnetostriction liquid level meter is an important process for ensuring the measurement accuracy and reliability, and is currently usually carried out in a manual operation mode, which requires an operator to manually slide the float ball on the guide rod to a calibration measurement point for measurement, for example, to move the float ball to the two ends of the guide rod as the upper limit and the lower limit. The manual operation has the problem of inaccurate calibration position of the float ball, and it is difficult to ensure the measurement accuracy. In particular, there is often a protruding welding scar at the tail end stop piece position of the guide rod, which may cause the float ball to be unable to move to the zero position due to the existence of the welding scar, resulting in zero deviation, affecting the accuracy of calibration measurement, and it is difficult to ensure the consistency of the calibration and measurement of the magnetostriction liquid level meter, and it is difficult to meet the high-precision requirement. SUMMARY

[0004] The purpose of the present application is to provide an automatic calibration equipment of magnetostriction liquid level meter to solve the technical problem of inaccurate calibration position of the float ball in the manual calibration process in the prior art, which is difficult to ensure the measurement accuracy, and often causes zero deviation due to the existence of the welding scar, affecting the accuracy of calibration measurement.

[0005] In order to achieve the above-mentioned purpose, the present application provides an automatic calibration equipment of magnetostriction liquid level meter, the magnetostriction liquid level meter comprising a guide rod and a float ball slidable along the guide rod, and the automatic calibration equipment comprising:

[0006] A pair of limiting seats are arranged on the calibration table surface in a spaced manner along the first direction, each of the limiting seats is used for connecting with one end of the guide rod, and the pair of limiting seats are used for clamping the guide rod in cooperation;

[0007] A float ball fixing unit is arranged on one or two limiting seats, the float ball fixing unit comprises a pressing end used for contacting with the float ball, and the float ball fixing unit is used for pressing and limiting the float ball at the end of the guide rod;

[0008] A displacement driving unit is arranged on the calibration table surface, and the displacement driving unit is used for clamping and controlling the float ball to slide along the guide rod;

[0009] A position sensor is used for detecting the position of the float ball;

[0010] A signal collection unit is configured to detect a calibration current of the magnetostrictive liquid level gauge.

[0011] In one or more embodiments, the floating ball fixing unit comprises:

[0012] A first telescopic mechanism is arranged on the limiting seat, and the first telescopic mechanism comprises a first telescopic end movable in the first direction;

[0013] A second telescopic mechanism is arranged on the first telescopic end, and the second telescopic mechanism comprises a second telescopic end movable in a second direction;

[0014] A thimble is arranged on the second telescopic end, and the thimble is arranged to point to the limiting seat;

[0015] The pressing end is arranged at one end of the thimble close to the limiting seat, and the second direction is perpendicular to the first direction.

[0016] In one or more embodiments, the floating ball fixing unit further comprises a bracket arranged on the second telescopic end, and an end of the bracket in the second direction is arranged with a notch matched with the guide rod;

[0017] The floating ball fixing unit comprises a pair of thimbles mounted on the bracket and symmetrically arranged on both sides of the notch.

[0018] In one or more embodiments, a guide rail is arranged on the calibration table surface in the first direction, and one or both of the limiting seats are slidably mounted on the guide rail.

[0019] In one or more embodiments, the displacement driving unit comprises:

[0020] A first linear module is arranged on the calibration table surface, and the first linear module comprises a first driving end movable in the first direction;

[0021] A second linear module is arranged on the first driving end, and the second linear module comprises a second driving end movable in a third direction;

[0022] A clamping jaw is arranged on the second driving end, and an end of the clamping jaw in the third direction is arranged with a clamping groove matched with the floating ball;

[0023] The third direction is perpendicular to the first direction.

[0024] In one or more embodiments, the limiting seat is provided with a limiting groove matched with the end of the guide rod, and the guide rod is embedded into the limiting groove at the corresponding end.

[0025] In one or more embodiments, the signal acquisition unit comprises an acquisition end electrically connected with the magnetostrictive liquid level meter, and the acquisition end is located on one or both of the limiting seats.

[0026] In one or more embodiments, one of the limiting seats is fixed on the calibration table, and the other is arranged to be slidable in the first direction; the floating ball fixing unit is arranged on the fixed limiting seat, and the signal acquisition unit is arranged on the slidable limiting seat.

[0027] In one or more embodiments, the position sensor is arranged beside the floating ball fixing unit, and the position sensor is used to detect the relative zero position when the floating ball is pressed and limited by the floating ball fixing unit at the end of the guide rod.

[0028] In one or more embodiments, the control unit and the display unit are further included, the control unit is signal connected with the floating ball fixing unit, the displacement driving unit, the position sensor and the signal acquisition unit, the control unit is used to control the working of the floating ball fixing unit, control the action of the displacement driving unit based on the feedback signal of the position sensor, and acquire the feedback signal of the signal acquisition unit; the display unit is used to display the real-time state of the calibration action and the calibration result.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] The automatic calibration device of the magnetostrictive liquid level meter can realize automatic calibration of the liquid level meter, ensure the accuracy of the calibration position, avoid the influence of the welding scar at the end of the guide rod on the calibration position, and meet the high-precision measurement requirement. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a structural schematic diagram of an embodiment of the automatic calibration device of the magnetostrictive liquid level meter of the application;

[0033] Figure 2 is a structural schematic diagram of an embodiment of the floating ball fixing unit of the application.

[0034] As shown in the figure:

[0035] The calibration platform 10;

[0036] The first limiting seat 20; the limiting groove 201;

[0037] The second limiting seat 30;

[0038] The first guide rail 40;

[0039] The displacement driving unit 50; the first linear module 501; the first driving end 5011; the second linear module 502; the second driving end 5021; the clamping jaw 503; the clamping groove 5031;

[0040] The floating ball fixing unit 60; the first telescopic mechanism 601; the first telescopic end 6011; the second telescopic mechanism 602; the second telescopic end 6021; the thimble 603; the pressing end 6031; the bracket 604; the notch 6041;

[0041] The position sensor 70;

[0042] The signal acquisition unit 80; the acquisition end 801;

[0043] The magnetostrictive liquid level meter 90; the guide rod 901; the floating ball 902. DETAILED DESCRIPTION

[0044] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0045] In order to solve the problem of inaccurate calibration position in the current manual calibration process, the applicant has developed an automatic calibration equipment for magnetostrictive liquid level meter, which can ensure the accuracy of the floating ball calibration position, and avoid the influence of the welding scar at the tail end of the guide rod on the accuracy of calibration measurement.

[0046] Specifically, please refer to Figure 1 , Figure 1 is a structural schematic diagram of an embodiment of the automatic calibration equipment for magnetostrictive liquid level meter of the present application.

[0047] As Figure 1As shown, the device comprises a first limiting seat 20 and a second limiting seat 30 arranged on the calibration table 10 along the x-axis direction, and the first limiting seat 20 and the second limiting seat 30 are respectively used for connecting with one end of the guide rod 901 of the magnetostriction liquid level meter 90, so as to cooperate with clamping the guide rod 901.

[0048] Specifically, in the embodiment, the first limiting seat 20 is fixed on the calibration table 10, and the second limiting seat 30 is arranged on the guide rail 40, and the guide rail 40 is arranged along the x-axis direction, so that the second limiting seat 30 can be arranged along the x-axis direction, and the distance between the first limiting seat 20 and the second limiting seat 30 is adjusted to adapt to different models and lengths of the magnetostriction liquid level meter 90.

[0049] Of course, in other embodiments, the first limiting seat 20 and the second limiting seat 30 can also be arranged on the guide rail and can be arranged to slide, and the effect of the embodiment can also be achieved.

[0050] In addition, in the embodiment, the first limiting seat 20 and the second limiting seat 30 are arranged with a limiting groove 201 matched with the end of the guide rod 901, and the end of the guide rod 901 is embedded in the limiting groove 201, so as to realize the clamping and fixing of the guide rod 901; in other embodiments, the first limiting seat 20 and / or the second limiting seat 30 can also be connected with the guide rod 901 in other ways, and the effect of the embodiment can also be achieved.

[0051] In order to realize the adjustment of the position of the floating ball 902 on the guide rod 901 of the magnetostriction liquid level meter 90, the automatic calibration device comprises a displacement driving unit 50 arranged on the calibration table 10, and the displacement driving unit 50 is used for clamping and controlling the floating ball 902 to slide along the guide rod 901.

[0052] Specifically, in the embodiment, the displacement driving unit 50 comprises a first linear module 501 arranged on the calibration table 10, and the first linear module 501 is arranged above the guide rod 901 and comprises a first driving end 5011 which can move along the x-axis direction. A second linear module 502 is arranged on the first driving end 5011, and the second linear module 502 comprises a second driving end 5021 which can move along the z-axis direction. A clamping jaw 503 is arranged on the second driving end 5021, and the bottom end of the clamping jaw 503 is provided with a clamping groove 5031 matched with the floating ball 902.

[0053] Based on the above structure of the displacement driving unit 50, when it is necessary to control the movement of the floating ball 902, the clamping jaw 503 can be adjusted to above the floating ball 902 through the first linear module 501, then the clamping jaw 503 is controlled to descend through the second linear module 502 until the floating ball 902 is embedded in the clamping groove 5031, and then the clamping jaw 503 and the floating ball 902 are driven to move synchronously through the first linear module 501.

[0054] In other embodiments, the first linear module 501 can also not be located above the guide rod 901, for example, it can also be arranged on one side or below the guide rod 901, and the movement direction of the second driving end 5021 is adjusted accordingly, which can also achieve the effect of the present embodiment.

[0055] In order to avoid the influence of the welding scar at the tail end of the guide rod 901 on the zero position accuracy of the floating ball 902, the automatic calibration device further comprises a floating ball fixing unit 60 arranged on the first limiting seat 20, which is used to press and limit the floating ball 902 at the end of the guide rod 901, so as to limit the floating ball 902 at the relative zero position.

[0056] Specifically, please refer to Figure 2 , Figure 2 is a structural schematic diagram of an embodiment of the floating ball fixing unit of the present application.

[0057] As Figure 2 shown, in the present embodiment, the floating ball fixing unit 60 comprises a first telescopic mechanism 601 arranged on the first limiting seat 20, which is arranged in the x-axis direction and extends towards the second limiting seat 30, and the first telescopic mechanism 601 comprises a first telescopic end 6011 which can move in the x-axis direction.

[0058] The first telescopic end 6011 is arranged with a second telescopic mechanism 602, which is arranged in the z-axis direction and extends, and the second telescopic mechanism 602 comprises a second telescopic end 6021 which can move in the z-axis direction.

[0059] The second telescopic end 6021 is arranged with a thimble 603, which is arranged to point to the first limiting seat 20, and the end of the thimble 603 is arranged with a pressing end 6031 for contacting the floating ball 902.

[0060] Based on the above structure, when it is needed to press and limit the floating ball 902 at the end of the guide rod 901, the thimble 603 can be adjusted to the side of the floating ball 902 away from the end of the guide rod 901 by the first telescopic mechanism 601, then the thimble 603 is adjusted to the corresponding height of the floating ball 902 by the second telescopic mechanism 602, then the floating ball 902 is pressed and limited at the end of the guide rod 901 by the thimble 603 controlled by the first telescopic mechanism 601, at this time the floating ball 902 is limited at the relative zero position, and the influence of the welding scar on the position accuracy can be avoided by detecting the relative zero position.

[0061] In order to ensure the stability of the floating ball 902 when being pressed and limited, in the embodiment, the second telescopic end 6021 of the second telescopic mechanism 602 is further provided with a support 604, and the top end of the support 604 is provided with a notch 6041 matched with the guide rod 901, so that the support 604 can be lifted to a position where the top end of the support 604 is flush with the floating ball 902. Further, in the embodiment, the floating ball fixing unit 60 includes a pair of top pins 603 fixed to the top end of the support 604, and the pair of top pins 603 are symmetrically arranged on both sides of the notch 6041, so that the both ends of the floating ball 902 are pressed and limited at the same time, thereby ensuring the stability.

[0062] It should be noted that, in the embodiment, the floating ball fixing unit 60 is arranged on the first limiting seat 20, so that the floating ball 902 can be pressed and limited at the tail end of the guide rod 901. In other embodiments, based on actual needs, the floating ball fixing unit 60 can also be arranged on the second limiting seat 30, or the floating ball fixing unit 60 can also be arranged on the first limiting seat 20 and the second limiting seat 30 at the same time, which can achieve the effect of the embodiment.

[0063] In addition, in the embodiment, the second telescopic mechanism 602 is arranged to extend along the z-axis direction. In other embodiments, based on the relative positions of the first telescopic mechanism 601 and the guide rod 901, the extension direction of the second telescopic mechanism 602 can be adaptively adjusted, so that the top pin 603 can be moved into and out of the end position of the floating ball 902, which can achieve the effect of the embodiment.

[0064] In the embodiment, the first telescopic mechanism 601 and the second telescopic mechanism 602 are gas cylinders. In other embodiments, other common telescopic devices in the art can achieve the effect of the present application.

[0065] In order to detect the position of the floating ball 902, the automatic calibration device further includes a position sensor 70. Specifically, in the embodiment, the position sensor 70 is arranged beside the floating ball fixing unit 60, and is used to detect the relative zero position when the floating ball 902 is moved to the end of the guide rod 901.

[0066] Specifically, in the detection process, the floating ball 902 can be first pressed and limited at the end of the guide rod 901 by the floating ball fixing unit 60, and the relative zero position is measured. The relative zero position is the lower limit of the floating ball 902 in the actual application of the liquid level meter. Based on the relative zero position and the range, the middle position and the full position of the floating ball 902 can be calculated, thereby ensuring the accuracy of the calibration position.

[0067] To detect the current of the liquid level meter when the float ball 902 is at the calibration position, the embodiment further comprises a signal acquisition unit 80. Specifically, the signal acquisition unit 80 comprises an acquisition end 801 located on the second limiting seat 30. When the liquid level meter is installed in place, the acquisition end 801 is connected with the liquid level meter to acquire the current output by the liquid level meter in real time. Specifically, the signal acquisition unit 80 can be a multimeter which can be electrically connected with the liquid level meter through a connection port, and details are not described herein.

[0068] To realize automatic calibration control, the automatic calibration device further comprises a control unit (not shown in the figure) which is signal connected with the float ball fixing unit 60, the displacement driving unit 50, the position sensor 70 and the signal acquisition unit 80. The control unit is used to control the float ball fixing unit 60 to work, control the displacement driving unit 50 to act based on the feedback signal of the position sensor 70, and acquire the feedback signal of the signal acquisition unit 80. A display unit is used to display the real-time state of the calibration action and the calibration result.

[0069] Specifically, in the embodiment, the control unit can be an industrial computer, and the calibration process can be specifically as follows:

[0070] 1. In response to a start calibration instruction, the industrial computer first controls the displacement driving unit 50 to adjust the float ball 902 to the tail end of the guide rod 901, and then controls the float ball fixing unit 60 to press the float ball 902 tightly to obtain the relative zero position fed back by the position sensor 70, and to calculate the mid-position and the full position based on the relative zero position.

[0071] 2. The calibration program is written into the product by the displacement driving unit 50, and then the float ball 902 is adjusted to the relative zero position, the mid-position and the full position respectively. Calibration is performed at each position and whether the calibration is successful is judged, while the current fed back by the signal acquisition unit 80 is acquired to judge whether the current value is correct, and whether the product is qualified after all calibration and verification are completed.

[0072] Further, in the embodiment, the automatic calibration device further comprises a display unit (not shown in the figure) which is used to display the real-time state of the calibration action and the calibration result. The real-time state of the calibration action includes the calibration state of each calibration position, and the calibration result includes the calibration current of each calibration position.

[0073] The automatic calibration device of the magnetostrictive liquid level meter 90 based on the above embodiments can realize automatic calibration of the liquid level meter, ensure the accuracy of the calibration position, avoid the influence of the guide rod 901 end weld on the calibration position, and meet the high-precision measurement requirement.

[0074] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0075] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. An automatic calibration apparatus for a magnetostrictive liquid level meter comprising a guide rod and a float ball slidable along the guide rod, characterized by, The automatic calibration device comprises: a pair of limiting seats arranged at intervals in a first direction on a calibration table top, each of the limiting seats being used for connecting with one end of the guide rod, and a pair of the limiting seats being used for clamping the guide rod; a floating ball fixing unit arranged on one or both of the limiting seats, the floating ball fixing unit comprising a pressing end used for contacting the floating ball, and the floating ball fixing unit being used for pressing and limiting the floating ball at the end of the guide rod; a displacement driving unit arranged on the calibration table top, the displacement driving unit being used for clamping and controlling the floating ball to slide along the guide rod; a position sensor used for detecting the position of the floating ball; a signal acquisition unit used for detecting the calibration current of the magnetostrictive liquid level meter.

2. The automatic calibration apparatus according to claim 1, characterized by The floating ball fixing unit comprises: a first telescopic mechanism arranged on the limiting seat, the first telescopic mechanism comprising a first telescopic end movable in the first direction; a second telescopic mechanism arranged on the first telescopic end, the second telescopic mechanism comprising a second telescopic end movable in a second direction; a thimble arranged on the second telescopic end, the thimble being directed to the limiting seat; wherein the pressing end is arranged at one end of the thimble close to the limiting seat, and the second direction is perpendicular to the first direction.

3. The automatic calibration apparatus according to claim 2, characterized by The floating ball fixing unit further comprises a bracket arranged on the second telescopic end, and an end of the bracket in the second direction is arranged with a notch matched with the guide rod; The floating ball fixing unit comprises a pair of thimbles, and the pair of thimbles are installed on the bracket and symmetrically arranged on both sides of the notch.

4. The automatic calibration apparatus according to claim 1, characterized by Further comprising a guide rail arranged on the calibration table top in the first direction, one or both of the pair of limiting seats being slidably installed on the guide rail.

5. The automatic calibration apparatus according to claim 1, characterized by The displacement driving unit comprises: a first linear module arranged on the calibration table top, the first linear module comprising a first driving end movable in the first direction; a second linear module arranged on the first driving end, the second linear module comprising a second driving end movable in a third direction; a clamping jaw arranged on the second driving end, an end of the clamping jaw in the third direction being arranged with a clamping groove matched with the floating ball; wherein the third direction is perpendicular to the first direction.

6. The automatic calibration apparatus according to claim 1, characterized by The limiting seat is provided with a limiting groove matched with the end of the guide rod, and the two ends of the guide rod are respectively embedded into the limiting groove of the corresponding end.

7. The automatic calibration apparatus according to claim 1, characterized by The signal acquisition unit comprises an acquisition end electrically connected with the magnetostrictive liquid level meter, and the acquisition end is located on one or both of the pair of limiting seats.

8. The automatic indexing apparatus of claim 1, wherein, One of the pair of limiting seats is fixed on the calibration table top, and the other one is slidably arranged in the first direction; the floating ball fixing unit is arranged on the fixed limiting seat, and the signal acquisition unit is arranged on the slidable limiting seat.

9. The automatic indexing apparatus of claim 1, wherein, The position sensor is arranged beside the floating ball fixing unit, and the position sensor is used for detecting the relative zero point position when the floating ball is pressed and limited by the floating ball fixing unit at the end of the guide rod.

10. The automatic indexing apparatus of claim 1, wherein, Also include control unit and display unit, the control unit is connected with the floating ball fixed unit, displacement driving unit, position sensor and signal acquisition unit signal, the control unit is used for controlling the floating ball fixed unit work, based on the feedback signal of position sensor controls the displacement driving unit action, and acquisition signal acquisition unit feedback signal;The display unit is used for displaying the real-time state and calibration result of calibration action.

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