CN109820568B - Pre-tightening force applying method, device and system of piezoelectric ceramic ultrasonic transducer - Google Patents
Pre-tightening force applying method, device and system of piezoelectric ceramic ultrasonic transducer Download PDFInfo
- Publication number
- CN109820568B CN109820568B CN201910122091.9A CN201910122091A CN109820568B CN 109820568 B CN109820568 B CN 109820568B CN 201910122091 A CN201910122091 A CN 201910122091A CN 109820568 B CN109820568 B CN 109820568B
- Authority
- CN
- China
- Prior art keywords
- pretightening force
- piezoelectric ceramic
- torque
- force
- difference value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a method, a device and a system for exerting pretightening force of a piezoelectric ceramic ultrasonic transducer. The method comprises the steps of obtaining the current pretightening force applied to the piezoelectric ceramic crystal stack; when the current pretightening force is smaller than the target pretightening force, increasing the torque applied to the pretightening bolt so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than the preset pretightening force tolerance. The technical scheme provided by the embodiment of the invention can ensure that the difference value between the pre-tightening force finally applied to the piezoelectric ceramic crystal stack and the target pre-tightening force is within the preset pre-tightening force tolerance range, and the accurate value of the pre-tightening force finally applied to the piezoelectric ceramic crystal stack can be obtained.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical instruments, in particular to a method, a device and a system for applying pretightening force of a piezoelectric ceramic ultrasonic transducer.
Background
The ultrasonic cutting hemostatic cutter has the advantages of small thermal injury, small error cutting probability, small eschar and the like, and is widely applied to minimally invasive surgeries of liver, gallbladder and the like of a laparoscope. Among them, the ultrasonic transducer is the core component of the whole ultrasonic cutting hemostatic knife, and the langevin sandwich piezoelectric transducer has a very wide application range because it can generate a high conversion efficiency of electric energy to mechanical energy.
In a langevin sandwich type piezoelectric transducer, a piezoelectric ceramic crystal stack plays a key role in converting electric energy into mechanical energy, and can generate compression-expansion mechanical vibration under the action of an alternating current signal, but because the tensile strength of the piezoelectric ceramic crystal stack is far lower than the compressive strength of the piezoelectric ceramic crystal stack, in order to avoid damage caused by the fact that the stress of the piezoelectric ceramic crystal stack is higher than the tensile strength in a stretching state, an axial pretightening force is usually applied to the piezoelectric ceramic crystal stack, so that the piezoelectric ceramic crystal stack is always in a compression state in the process of generating axial mechanical vibration. The pre-tightening force is usually applied by rotating a pre-tightening bolt on one side of the piezoelectric ceramic crystal stack by using a torque wrench, and stopping when the torque applied to the pre-tightening bolt reaches a preset value.
However, the friction between the threads, the friction between the end face of the bolt and the piezoelectric ceramic crystal stack, the size of the pre-tightening bolt, and the size of the thread on the head of the pre-tightening bolt all make the torque applied to the pre-tightening bolt and the pre-tightening force applied to the piezoelectric ceramic crystal stack have no exact corresponding relationship, so that the specific value of the pre-tightening force applied to the piezoelectric ceramic crystal stack cannot be accurately known, that is, whether the pre-tightening force applied to the piezoelectric ceramic crystal stack reaches the target value cannot be known.
Disclosure of Invention
The invention provides a method, a device and a system for applying pretightening force of a piezoelectric ceramic ultrasonic transducer, which are used for realizing that the difference value between the pretightening force finally applied to a piezoelectric ceramic crystal stack and a target pretightening force is within a preset pretightening force tolerance range and acquiring the accurate value of the pretightening force finally applied to the piezoelectric ceramic crystal stack.
In a first aspect, an embodiment of the present invention provides a method for applying a pre-tightening force to a piezoelectric ceramic ultrasonic transducer, where the method includes:
acquiring current pretightening force applied to the piezoelectric ceramic crystal stack;
when the current pretightening force is smaller than the target pretightening force, increasing the torque applied to the pretightening bolt so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than the preset pretightening force tolerance.
Optionally, acquiring the current pre-tightening force applied to the piezoelectric ceramic crystal stack includes:
acquiring the electric field intensity of an electric field generated by the piezoelectric ceramic crystal stack under the action of the current pretightening force;
and calculating the current pretightening force of the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force of the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force.
Optionally, when the current pretightening force is smaller than the target pretightening force, increasing the torque applied to the pretightening bolt so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than the preset pretightening force tolerance, the method comprises the following steps:
when the current pretightening force is smaller than the target pretightening force, judging whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force difference value;
if so, increasing the torque applied to the pre-tightening bolt by a preset torque step increment so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value;
judging whether the difference value of the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance;
when the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force tolerance, updating the preset pretightening force difference value, updating the preset torque step increment, and increasing the torque applied to the pretightening bolt by using the updated preset torque step increment so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack, so that the difference value between the current pretightening force and the target pretightening force is smaller than the updated preset pretightening force difference value; until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force tolerance;
the updated preset pretightening force difference value is 1/N of the difference value between the current pretightening force and the target pretightening force, and the updated preset torque step increment is 1/N of the preset torque step increment before updating; the initial value of the preset pretightening force difference value is 1/N of the target pretightening force, the initial value of the preset torque stepping increment is 1/M of the reference applied torque, M and N are positive integers larger than 1, and M is larger than N; the reference applied torque refers to the torque which needs to be applied to the pre-tightening bolt when the target pre-tightening force is applied to the qualified piezoelectric ceramic crystal stack.
Optionally, N is greater than or equal to 2 and less than or equal to 6; m is 10 or more and 30 or less.
Optionally, when the current pretightening force is smaller than the target pretightening force, increasing the torque applied to the pretightening bolt so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack; the method further comprises the following steps until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than a preset pretightening force tolerance:
acquiring actual applied torque applied to the pre-tightening bolt;
calculating a torque difference value between the actual applied torque and the reference applied torque;
and judging whether the torque difference value is within a preset torque tolerance range, if so, determining that the piezoelectric ceramic crystal stack is a qualified product, and if not, determining that the piezoelectric ceramic crystal stack is a defective product.
In a second aspect, an embodiment of the present invention further provides a pre-tightening force applying device for a piezoelectric ceramic ultrasonic transducer, where the device includes: the device comprises a current pretightening force acquisition module and a pretightening force increasing module;
the pre-tightening force acquisition module is used for acquiring the current pre-tightening force applied to the piezoelectric ceramic crystal stack;
the pre-tightening force increasing module is used for increasing the torque applied to the pre-tightening bolt when the current pre-tightening force is smaller than the target pre-tightening force so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than the preset pretightening force tolerance.
Optionally, the current pretightening force acquisition module includes an electric field strength acquisition module and a current pretightening force calculation module;
the electric field intensity acquisition module is used for acquiring the electric field intensity of an electric field generated by the piezoelectric ceramic crystal stack under the action of the current pretightening force;
and the current pretightening force calculation module is used for calculating the current pretightening force of the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force applied to the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force.
Optionally, the pretension increasing module includes: the device comprises a first judgment module, a first increasing module, a second judgment module and a second increasing module;
the first judgment module is used for judging whether the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force difference value or not when the current pretightening force is smaller than the target pretightening force;
the first increasing module is used for increasing the torque applied to the pre-tightening bolt by a preset torque step increment to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack when the difference value between the current pre-tightening force and the target pre-tightening force is larger than the preset pre-tightening force difference value; until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value;
the second judgment module is used for judging whether the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force tolerance or not;
the second increasing module is used for updating the preset pretightening force difference value, updating the preset torque increment and increasing the torque applied to the pretightening bolt according to the updated preset torque increment when the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force tolerance so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack, so that the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value; until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force tolerance;
the updated preset pretightening force difference value is 1/N of the difference value between the current pretightening force and the target pretightening force, and the updated preset torque step increment is 1/N of the preset torque step increment before updating; the initial value of the preset pretightening force difference value is 1/N of the target pretightening force, the initial value of the preset torque stepping increment is 1/M of the reference applied torque, M and N are positive integers larger than 1, and M is larger than N; the reference applied torque refers to the torque which needs to be applied to the pre-tightening bolt when the target pre-tightening force is applied to the qualified piezoelectric ceramic crystal stack.
Optionally, N is greater than or equal to 2 and less than or equal to 6; m is 10 or more and 30 or less.
Optionally, the device further comprises an actually applied torque obtaining module, a torque difference value calculating module, a third judging module, a qualified product identifying module and a defective product identifying module;
the torque acquisition module is used for acquiring actual applied torque applied to the pre-tightening bolt;
the torque difference value calculation module is used for calculating a torque difference value between the actual applied torque and the reference applied torque;
the third judgment module is used for judging whether the torque difference value is within a preset torque tolerance range;
the qualified product identification module is used for identifying the piezoelectric ceramic crystal stack as a qualified product when the torque difference value is within a preset torque tolerance range;
and the defective product identification module is used for identifying the piezoelectric ceramic crystal stack as a defective product when the torque difference value exceeds the preset torque tolerance range.
In a third aspect, an embodiment of the present invention further provides a pretightening force application system for a piezoelectric ceramic ultrasonic transducer, where the pretightening force application system includes: the piezoelectric ceramic ultrasonic transducer comprises a motor, an intermediate connecting piece, a sampling circuit and a controller, wherein the controller comprises a pretightening force applying device of any piezoelectric ceramic ultrasonic transducer in the second aspect;
the controller is respectively connected with the sampling circuit and the motor; the motor is connected with a pre-tightening bolt on the piezoelectric ceramic ultrasonic transducer through an intermediate connecting piece; the sampling circuit is connected with an electrode plate in a piezoelectric ceramic crystal stack on the piezoelectric ceramic ultrasonic transducer;
the middle connecting piece is used for transmitting the torque applied by the motor to the pre-tightening bolt so as to apply the torque to the pre-tightening bolt;
the sampling circuit is used for collecting the voltage at two ends of at least one piece of piezoelectric ceramic in the piezoelectric ceramic crystal stack and sending the voltage to the controller;
after the controller acquires the voltage, calculating the electric field intensity of an electric field generated by at least one piece of piezoelectric ceramic corresponding to the voltage, and calculating the current pretightening force applied to the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force applied to the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force; when the current pretightening force is smaller than the target pretightening force, controlling a motor to increase the torque applied to the pretightening bolt through an intermediate connecting piece so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack until the difference between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than a preset pretightening force tolerance;
the electric field intensity of the electric field generated by the piezoelectric ceramic crystal pile under the action of the pretightening force is the same as that of the electric field generated by any one piece of piezoelectric ceramic in the piezoelectric ceramic crystal pile under the action of the pretightening force.
According to the pretightening force applying method of the piezoelectric ceramic ultrasonic transducer provided by the embodiment of the invention, the current pretightening force applied to the piezoelectric ceramic crystal stack is obtained in real time, and the pretightening force applied to the piezoelectric ceramic crystal stack is increased when the current pretightening force is smaller than the target pretightening force, so that the pretightening force finally applied to the piezoelectric ceramic crystal stack is equal to the target pretightening force, the problem that only the actual applied torque applied to a pretightening bolt can be obtained but the pretightening force applied to the piezoelectric ceramic crystal stack cannot be obtained in the prior art is solved, the difference value between the pretightening force finally applied to the piezoelectric ceramic crystal stack and the target pretightening force is within the preset pretightening force tolerance range, and the accurate value of the.
Drawings
Fig. 1 is a flowchart of a pretensioning force application method for a piezoelectric ceramic ultrasonic transducer according to an embodiment of the present invention;
fig. 2 is a flowchart of a pretensioning force application method for a piezoelectric ceramic ultrasonic transducer according to a second embodiment of the present invention;
fig. 3 is a pretightening force applying apparatus for a piezoelectric ceramic ultrasonic transducer according to a third embodiment of the present invention;
fig. 4 is a pretightening force applying system of a piezoelectric ceramic ultrasonic transducer according to a fourth embodiment of the present invention;
fig. 5 is a flowchart illustrating a pretightening force applying system of a piezoelectric ceramic ultrasonic transducer according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for applying a pre-tightening force to a piezoelectric ceramic ultrasonic transducer according to an embodiment of the present invention, which is applicable to applying a pre-tightening force to a piezoelectric ceramic crystal stack in a langevin sandwich piezoelectric transducer. Specifically, the method for applying the pre-tightening force of the piezoelectric ceramic ultrasonic transducer may be performed by a pre-tightening force applying device of the piezoelectric ceramic ultrasonic transducer, and the pre-tightening force applying device of the piezoelectric ceramic ultrasonic transducer may be implemented in a software and/or hardware manner and integrated into the controller.
Referring to fig. 1, the method specifically includes the following steps:
and S110, acquiring the current pretightening force applied to the piezoelectric ceramic crystal stack.
The method comprises the steps of assembling a piezoelectric ceramic crystal stack and other components of a piezoelectric ceramic ultrasonic transducer, wherein the step of applying a pre-tightening force to the piezoelectric ceramic crystal stack is usually completed in the process of assembling the piezoelectric ceramic crystal stack and the other components of the piezoelectric ceramic ultrasonic transducer, a pre-tightening bolt is arranged on one side of the piezoelectric ceramic crystal stack, the purpose of applying the pre-tightening force to the piezoelectric ceramic crystal stack can be achieved by applying a torque to the pre-tightening bolt, and the pre-tightening force is a force which is generated between the pre-tightening bolt and the piezoelectric ceramic crystal stack along the axial lead direction of the pre-tightening.
Specifically, the controller needs to obtain the current pre-tightening force applied to the piezoelectric ceramic crystal stack in real time to judge whether the current pre-tightening force is smaller than the target pre-tightening force.
S120, when the current pretightening force is smaller than the target pretightening force, increasing the torque applied to the pretightening bolt so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than the preset pretightening force tolerance. Exemplary pretension application procedures are as follows: and when the current pretightening force is smaller than the target pretightening force, the controller controls the torque applied on the pretightening bolt by the motor to continuously and gradually increase, so that the pretightening force applied on the piezoelectric ceramic crystal stack is continuously increased in the forward direction until the difference between the pretightening force finally applied on the piezoelectric ceramic crystal stack and the target pretightening force is within a preset pretightening force tolerance range. It is understood that the preset pretightening force tolerance can be set according to actual conditions, and the preset pretightening force tolerance is not limited in the application.
According to the pretightening force applying method of the piezoelectric ceramic ultrasonic transducer provided by the embodiment of the invention, the current pretightening force applied to the piezoelectric ceramic crystal stack is obtained in real time, and the pretightening force applied to the piezoelectric ceramic crystal stack is increased when the current pretightening force is smaller than the target pretightening force, so that the pretightening force finally applied to the piezoelectric ceramic crystal stack is equal to the target pretightening force, the problem that only the actual applied torque applied to a pretightening bolt can be obtained but the pretightening force applied to the piezoelectric ceramic crystal stack cannot be obtained in the prior art is solved, the difference value between the pretightening force finally applied to the piezoelectric ceramic crystal stack and the target pretightening force is within the preset pretightening force tolerance range, and the accurate value of the.
With continuing reference to fig. 1, on the basis of the foregoing technical solution, optionally, after S120, the method further includes:
and S130, acquiring the actual applied torque applied to the pre-tightening bolt.
The pre-tightening force applied to the pressure ceramic crystal stack is increased by increasing the torque applied to the pre-tightening bolt, when the difference value between the pre-tightening force applied to the pressure ceramic crystal stack and the target pre-tightening force is within a preset pre-tightening force tolerance range, the pre-tightening force is applied, and at the moment, the torque applied to the pre-tightening bolt is the actual applied torque.
And S140, calculating a torque difference value between the actual applied torque and the reference applied torque.
The reference applied torque refers to the torque which needs to be applied to the pre-tightening bolt when the target pre-tightening force is applied to the qualified piezoelectric ceramic crystal stack. Specifically, before the piezoelectric ceramic crystal stacks of the batch are installed and applied with the pre-tightening force, a large number of experiments are required, the experiment content is to obtain the actual applied torque required when the qualified piezoelectric ceramic crystal stacks are applied with the target pre-tightening force so as to obtain a large number of actual applied torques, and the reference applied torque can be obtained after the analysis (for example, averaging) of the large number of actual applied torques.
S150, judging whether the torque difference value is within a preset torque tolerance range, if so, determining that the piezoelectric ceramic crystal stack is a qualified product, and if not, determining that the piezoelectric ceramic crystal stack is a defective product.
The piezoelectric ceramic crystal stack is formed by stacking a plurality of piezoelectric ceramic pieces, and when the piezoelectric ceramic crystal stack is a defective product due to the fact that the parallelism of the plurality of piezoelectric ceramic pieces does not meet the requirement or other factors, the torque difference value is usually not within the preset torque tolerance range. It is understood that the preset torque tolerance can be set according to actual conditions, and the application is not limited to this.
Illustratively, when the torque difference value is within the tolerance range, the piezoelectric ceramic crystal stack is qualified; when the torque difference value exceeds the tolerance range, the piezoelectric ceramic crystal pile is a defective product, and the pre-tightening bolt needs to be unscrewed to replace the piezoelectric ceramic crystal pile.
According to the method for applying the pre-tightening force to the piezoelectric ceramic ultrasonic transducer, provided by the embodiment of the invention, after the pre-tightening force is applied to the piezoelectric ceramic crystal pile, whether the piezoelectric ceramic crystal pile is a qualified product is immediately judged, so that a new piezoelectric ceramic crystal pile can be timely replaced when the piezoelectric ceramic crystal pile is a defective product, and therefore, the assembled piezoelectric ceramic ultrasonic transducer is ensured to have the qualified piezoelectric ceramic crystal pile.
Example two
Fig. 2 is a flowchart of a pretensioning force application method for a piezoelectric ceramic ultrasonic transducer according to a second embodiment of the present invention, which is embodied on the basis of the above embodiments. Specifically, referring to fig. 2, the method specifically includes the following steps:
s210, obtaining the electric field intensity of an electric field generated by the piezoelectric ceramic crystal stack under the action of the current pretightening force.
The piezoelectric ceramic is a functional ceramic, an external force is applied to the piezoelectric ceramic, and charges are generated on the surface of the piezoelectric ceramic, which is the positive piezoelectric effect of the piezoelectric ceramic and is a process for converting mechanical energy into electric energy; an electric field is applied to the piezoelectric ceramic, and the piezoelectric ceramic deforms, which is the inverse piezoelectric effect of the piezoelectric ceramic. According to the direct piezoelectric effect of the piezoelectric ceramic, under the action of the current pretightening force, the piezoelectric ceramic crystal stack can generate an electric field.
Illustratively, the voltage at two ends of a piece of piezoelectric ceramic in the piezoelectric ceramic crystal stack is collected, and the electric field intensity of the electric field generated by the piece of piezoelectric ceramic can be obtained by comparing the voltage with the length of the piece of piezoelectric ceramic along the electric field intensity direction. It is understood that the piezoceramics stacked in the sandwich piezoceramic ultrasonic transducer are mechanically connected in series and electrically connected in parallel when stacked into a crystal stack. Therefore, under the condition that the pretightening force exerted on each piece of piezoelectric ceramic is the same, the voltage generated when each piece of piezoelectric ceramic is stressed by the pretightening force is equal, namely the electric field intensity generated by each piece of piezoelectric ceramic is consistent, and meanwhile, the voltage at two ends of the piezoelectric ceramic crystal stack is equal to the voltage at two ends of any piece of piezoelectric ceramic. Therefore, a person skilled in the art can collect the voltage at two ends of any piece of piezoelectric ceramic in the piezoelectric ceramic crystal stack according to the actual situation.
S220, calculating the current pretightening force of the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force of the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force.
Before the pre-tightening force is applied to the batch of piezoelectric ceramic crystal piles, a large number of experiments are required, the experiment contents include that when the pre-tightening force applied to two ends of the piezoelectric ceramic crystal piles is gradually increased, voltages at two ends of the piezoelectric ceramic crystal piles are correspondingly acquired, the electric field intensity of an electric field generated by the voltages at two ends of the piezoelectric ceramic crystal piles is calculated, so that the one-to-one correspondence relationship between the pre-tightening force and the electric field intensity of the batch of piezoelectric ceramic crystal piles is obtained, and the current pre-tightening force of the piezoelectric ceramic crystal piles can be calculated through the correspondence relationship. It should be noted that during the experiment, the pre-tightening force must be gradually increased, and cannot be reduced or interrupted so as to avoid the disappearance of the transient electric field generated across the piezoelectric ceramic stack.
S230, when the current pretightening force is smaller than the target pretightening force, whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force difference value is judged.
S240, if so, increasing the torque applied to the pre-tightening bolt by a preset torque step increment so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack; and until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value.
The pre-tightening force applied to the piezoelectric ceramic crystal stack is a positive and continuous process, namely the pre-tightening force needs to be gradually increased from small to large and cannot be reduced or interrupted. If the preset torque stepping increment is set to be larger in order to increase the pretightening force increasing speed, the current pretightening force is likely to suddenly exceed the target pretightening force, and the difference value between the current pretightening force and the target pretightening force exceeds the preset tolerance range; if the preset torque is set to be small in increments in order to avoid sudden and large exceeding of the current pretension by the target pretension, the process of applying the pretension takes a long time. In order to solve the above problems, the pre-tightening force increasing process can be performed in stages, and the preset torque step increments in different pre-tightening force increasing stages are different.
Specifically, in each stage, a preset torque step increment and a preset pretightening force difference value corresponding to the stage are provided, and the controller controls the motor to increase the torque applied to the pretightening bolt by the preset torque step increment so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack until the difference between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value, so that the pretightening force increasing task in the stage is completed.
And S250, judging whether the difference value of the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance.
Specifically, after completing the pre-tightening force increasing task of one stage, the controller detects whether the difference value between the current pre-tightening force and the target pre-tightening force is greater than a preset pre-tightening force tolerance, and if the difference value is not greater than the preset pre-tightening force tolerance, the pre-tightening force application is completed; if the pre-tightening force is larger than the preset pre-tightening force tolerance, the current pre-tightening force still needs to be increased, and a next pre-tightening force increasing stage needs to be started.
S260, when the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force tolerance, updating the preset pretightening force difference value, updating the preset torque step increment, and increasing the torque applied to the pretightening bolt by using the updated preset torque step increment so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack, so that the difference value between the current pretightening force and the target pretightening force is smaller than the updated preset pretightening force difference value; and until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force tolerance.
And the updated preset pretightening force difference value is 1/N of the difference value between the current pretightening force and the target pretightening force, and the updated preset torque step increment is 1/N of the preset torque step increment before updating. The initial value of the preset pretightening force difference value is 1/N of the target pretightening force, the initial value of the preset torque stepping increment is 1/M of the reference applied torque, M and N are positive integers larger than 1, and M is larger than N. Optionally, N is greater than or equal to 2 and less than or equal to 6; m is 10 or more and 30 or less.
According to the pretightening force applying method of the piezoelectric ceramic ultrasonic transducer provided by the embodiment of the invention, the pretightening force is increased greatly by gradually reducing the preset torque step increment when the difference between the current pretightening force and the target pretightening force is far, so that the pretightening force is increased rapidly; when the difference between the current pretightening force and the target pretightening force is smaller, the pretightening force is smaller in amplitude so as to prevent the current pretightening force from suddenly and greatly exceeding the target pretightening force and the difference between the current pretightening force and the target pretightening force from exceeding the preset pretightening force tolerance.
EXAMPLE III
Fig. 3 is a pretightening force applying apparatus for a piezoelectric ceramic ultrasonic transducer according to a third embodiment of the present invention, including: a current pretension acquisition module 310 and a pretension increasing module 320.
A pretightening force obtaining module 310, configured to obtain a current pretightening force applied to the piezoelectric ceramic crystal stack;
the pre-tightening force increasing module 320 is used for increasing the torque applied to the pre-tightening bolt when the current pre-tightening force is smaller than the target pre-tightening force so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than the preset pretightening force tolerance.
According to the pre-tightening force applying device of the piezoelectric ceramic ultrasonic transducer provided by the embodiment of the invention, the pre-tightening force obtaining module 310 is used for obtaining the current pre-tightening force applied to the piezoelectric ceramic crystal pile in real time, and the pre-tightening force increasing module 320 is used for increasing the pre-tightening force applied to the piezoelectric ceramic crystal pile when the current pre-tightening force is smaller than the target pre-tightening force so as to enable the pre-tightening force finally applied to the piezoelectric ceramic crystal pile to be equal to the target pre-tightening force.
On the basis of the above technical solution, optionally, the current pretightening force obtaining module 310 includes an electric field strength obtaining module and a current pretightening force calculating module.
And the electric field intensity acquisition module is used for acquiring the electric field intensity of an electric field generated by the piezoelectric ceramic crystal stack under the action of the current pretightening force.
And the current pretightening force calculation module is used for calculating the current pretightening force of the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force applied to the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force.
Optionally, the pretension increasing module 320 includes: the device comprises a first judgment module, a first increasing module, a second judgment module and a second increasing module.
The first judgment module is used for judging whether the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force difference value or not when the current pretightening force is smaller than the target pretightening force.
The first increasing module is used for increasing the torque applied to the pre-tightening bolt by a preset torque step increment to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack when the difference value between the current pre-tightening force and the target pre-tightening force is larger than the preset pre-tightening force difference value; and until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value.
And the second judgment module is used for judging whether the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force tolerance.
The second increasing module is used for updating the preset pretightening force difference value, updating the preset torque increment and increasing the torque applied to the pretightening bolt according to the updated preset torque increment when the difference value between the current pretightening force and the target pretightening force is larger than the preset pretightening force tolerance so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack, so that the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value; and until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force tolerance.
The updated preset pretightening force difference value is 1/N of the difference value between the current pretightening force and the target pretightening force, and the updated preset torque step increment is 1/N of the preset torque step increment before updating; the initial value of the preset pretightening force difference value is 1/N of the target pretightening force, the initial value of the preset torque stepping increment is 1/M of the reference applied torque, M and N are positive integers larger than 1, and M is larger than N; the reference applied torque refers to the torque which needs to be applied to the pre-tightening bolt when the target pre-tightening force is applied to the qualified piezoelectric ceramic crystal stack.
Optionally, N is greater than or equal to 2 and less than or equal to 6; m is 10 or more and 30 or less.
Optionally, the device further includes an actually applied torque obtaining module, a torque difference value calculating module, a third determining module, a qualified product identifying module and a defective product identifying module.
And the torque acquisition module is used for acquiring the actual applied torque applied to the pre-tightening bolt.
And the torque difference value calculation module is used for calculating the torque difference value of the actual applied torque and the reference applied torque.
And the third judgment module is used for judging whether the torque difference value is within a preset torque tolerance range.
And the qualified product identification module is used for identifying the piezoelectric ceramic crystal stack as a qualified product when the torque difference value is within the preset torque tolerance range.
And the defective product identification module is used for identifying the piezoelectric ceramic crystal stack as a defective product when the torque difference value exceeds the preset torque tolerance range.
The pretightening force applying device for the piezoelectric ceramic ultrasonic transducer provided by the third embodiment of the invention can be used for executing the pretightening force applying method for the piezoelectric ceramic ultrasonic transducer provided by any embodiment, and has corresponding functions and beneficial effects.
Example four
Fig. 4 is a pretightening force application system of a piezoelectric ceramic ultrasonic transducer according to a fourth embodiment of the present invention. The system comprises: a motor 410, an intermediate connector 420, a sampling circuit 430 and a controller 440, wherein the controller 440 comprises the pretensioning device of any one of the piezoceramic ultrasonic transducers of the second aspect. As shown in fig. 4, the pre-tightening bolt penetrates through an electrode plate (not shown in fig. 4) and the piezoelectric ceramic crystal stack 450 and is sleeved in the metal front cover of the piezoelectric ceramic ultrasonic transducer, positive and negative electrodes in the piezoelectric ceramic crystal stack 450 are led out by the electrode plate through a lead and are connected to an interface of the sampling circuit 430, the controller 440 is respectively connected with the sampling circuit 430 and the motor 410, and the motor 410 and the pre-tightening bolt on the piezoelectric ceramic ultrasonic transducer are connected through the intermediate connecting member 420.
And an intermediate coupling member 420 for transmitting the torque applied from the motor 410 to the pre-tightening bolt to apply the torque to the pre-tightening bolt. Illustratively, when the head of the pretensioning bolt is hexagonal, one end of the intermediate connector 420 has an internal hexagonal shape that mates with the hexagonal shape of the head of the pretensioning bolt. It is understood that the selection of the intermediate connecting member 420 can be set according to practical situations as long as the function of transmitting the torque applied by the motor 410 to the pre-tightening bolt can be achieved, and the application is not limited thereto.
And the sampling circuit 430 is configured to collect voltages across at least one piece of piezoelectric ceramic in the piezoelectric ceramic crystal stack 450, and send the voltages to the controller 440.
After acquiring the voltage, the controller 440 calculates the electric field intensity of the electric field generated by at least one piece of piezoelectric ceramic corresponding to the voltage, and calculates the current pre-tightening force applied to the piezoelectric ceramic crystal stack 450 according to the one-to-one correspondence relationship between the pre-tightening force applied to the piezoelectric ceramic crystal stack 450 and the electric field intensity of the electric field generated under the action of the pre-tightening force; when the current pretightening force is smaller than the target pretightening force, the motor 410 is controlled to increase the torque applied to the pretightening bolt through the intermediate connecting member 420 to increase the pretightening force applied to the piezoelectric ceramic crystal stack 450 until the difference between the current pretightening force applied to the piezoelectric ceramic crystal stack 450 and the target pretightening force is smaller than the preset pretightening force tolerance. The electric field intensity of the electric field generated by the piezoelectric ceramic crystal stack 450 under the action of the pre-tightening force is the same as the electric field intensity of the electric field generated by any one piece of piezoelectric ceramic in the piezoelectric ceramic crystal stack 450 under the action of the pre-tightening force.
The pretightening force applying system of the piezoelectric ceramic ultrasonic transducer comprises pretightening force application of any one of the piezoelectric ceramic ultrasonic transducers, so that the pretightening force applying system of the piezoelectric ceramic ultrasonic transducer has corresponding functions and beneficial effects.
On the basis of the technical scheme, optionally, the pretightening force applying system of the piezoelectric ceramic ultrasonic transducer further comprises a liquid crystal screen and/or a buzzer, the liquid crystal screen and the buzzer are connected with the controller and used for prompting whether the piezoelectric ceramic crystal stack applying the pretightening force is qualified or unqualified after the pretightening force is applied, and in addition, the liquid crystal screen has a touch function simultaneously so that a user can interact with the pretightening force applying system of the piezoelectric ceramic ultrasonic transducer through the liquid crystal screen.
Fig. 5 is a flowchart of applying a preload by a preload application system of a piezoelectric ceramic ultrasonic transducer according to a fourth embodiment of the present invention, in which the process is detailed as follows:
s410, setting 1/3 that the initial values of the target pretightening force, the reference applied torque, the preset pretightening force tolerance, the preset torque tolerance and the preset pretightening force difference value are the target pretightening force and 1/15 that the initial values of the preset torque step increment are the reference applied torque to the controller through the liquid crystal display.
And S420, acquiring the current pretightening force applied to the piezoelectric ceramic crystal stack by the controller.
S430, the controller judges whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force difference value, if yes, the controller returns to execute S420 and S430 after executing S440; if not, go to S450.
And S440, the controller controls the motor to increase the torque applied to the pre-tightening bolt by preset torque step increment so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack.
S450, the controller judges whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance, if so, after S460 is executed, the execution returns to S420-S450; if not, go to S470.
And S460, updating the preset pretightening force difference value to 1/3 of the current pretightening force and the target pretightening force difference value and updating the preset torque step increment to 1/3 of the preset torque step increment before updating by the controller.
And S470, acquiring the actual applied torque applied to the pre-tightening bolt by the controller.
And S480, the controller calculates a torque difference value between the actual applied torque and the reference applied torque.
S490, the controller judges whether the torque difference value is within a preset torque tolerance range, if so, S510 is executed; if not, go to S520.
And S510, the controller determines that the piezoelectric ceramic crystal stack is qualified, and controls the liquid crystal screen to display the information that the piezoelectric ceramic crystal stack is qualified.
S520, the controller determines that the piezoelectric ceramic crystal stack is a defective product and controls the liquid crystal screen to display information that the piezoelectric ceramic crystal stack is the defective product.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A pretightening force applying method for a piezoelectric ceramic ultrasonic transducer is characterized by comprising the following steps:
acquiring current pretightening force applied to the piezoelectric ceramic crystal stack;
when the current pretightening force is smaller than the target pretightening force, increasing the torque applied to the pretightening bolt so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack; until the difference between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than a preset pretightening force tolerance, the method comprises the following steps:
when the current pretightening force is smaller than a target pretightening force, judging whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force difference value;
if so, increasing the torque applied to the pre-tightening bolt by a preset torque step increment so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value;
judging whether the difference value of the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance;
when the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance, updating the preset pretightening force difference value, updating the preset torque step increment, and increasing the torque applied to a pretightening bolt by using the updated preset torque step increment so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack, so that the difference value between the current pretightening force and the target pretightening force is smaller than the updated preset pretightening force difference value; until the difference value between the current pretightening force and the target pretightening force is smaller than a preset pretightening force tolerance;
the updated preset pretightening force difference value is 1/N of the difference value between the current pretightening force and the target pretightening force, and the updated preset torque step increment is 1/N of the preset torque step increment before updating; the initial value of the preset pretightening force difference value is 1/N of the target pretightening force, the initial value of the preset torque stepping increment is 1/M of the reference applied torque, M and N are positive integers larger than 1, and M is larger than N; the reference applied torque is the torque which needs to be applied to the pre-tightening bolt when the target pre-tightening force is applied to the qualified piezoelectric ceramic crystal stack;
n is greater than or equal to 2 and less than or equal to 6; m is 10 or more and 30 or less.
2. The method of claim 1, wherein said obtaining a current preload force applied to the piezo ceramic stack comprises:
acquiring the electric field intensity of an electric field generated by the piezoelectric ceramic crystal stack under the action of the current pretightening force;
and calculating the current pretightening force of the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force of the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force.
3. The method of claim 1, wherein when the current preload force is less than the target preload force, the torque applied to the preload bolt is increased to increase the preload force applied to the piezo ceramic stack; the method further comprises the following steps until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than a preset pretightening force tolerance:
acquiring actual applied torque applied to the pre-tightening bolt;
calculating a torque difference value of the actual applied torque and a reference applied torque;
and judging whether the torque difference value is within a preset torque tolerance range, if so, determining that the piezoelectric ceramic crystal stack is a qualified product, and if not, determining that the piezoelectric ceramic crystal stack is a defective product.
4. A pre-tightening force applying device for a piezoelectric ceramic ultrasonic transducer, comprising: the device comprises a current pretightening force acquisition module and a pretightening force increasing module;
the pre-tightening force acquisition module is used for acquiring the current pre-tightening force applied to the piezoelectric ceramic crystal stack;
the pre-tightening force increasing module is used for increasing the torque applied to the pre-tightening bolt when the current pre-tightening force is smaller than the target pre-tightening force so as to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack; until the difference value between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than a preset pretightening force tolerance;
the pretension increasing module comprises: the device comprises a first judgment module, a first increasing module, a second judgment module and a second increasing module;
the first judgment module is used for judging whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force difference value or not when the current pretightening force is smaller than the target pretightening force;
the first increasing module is used for increasing the torque applied to the pre-tightening bolt by preset torque step increment to increase the pre-tightening force applied to the piezoelectric ceramic crystal stack when the difference value between the current pre-tightening force and the target pre-tightening force is larger than a preset pre-tightening force difference value; until the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value;
the second judgment module is used for judging whether the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance;
the second increasing module is used for updating the preset pretightening force difference value, updating the preset torque increment and increasing the torque applied to the pretightening bolt by the updated preset torque increment when the difference value between the current pretightening force and the target pretightening force is larger than a preset pretightening force tolerance so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack, so that the difference value between the current pretightening force and the target pretightening force is smaller than the preset pretightening force difference value; until the difference value between the current pretightening force and the target pretightening force is smaller than a preset pretightening force tolerance;
the updated preset pretightening force difference value is 1/N of the difference value between the current pretightening force and the target pretightening force, and the updated preset torque step increment is 1/N of the preset torque step increment before updating; the initial value of the preset pretightening force difference value is 1/N of the target pretightening force, the initial value of the preset torque stepping increment is 1/M of the reference applied torque, M and N are positive integers larger than 1, and M is larger than N; the reference applied torque is the torque which needs to be applied to the pre-tightening bolt when the target pre-tightening force is applied to the qualified piezoelectric ceramic crystal stack;
n is greater than or equal to 2 and less than or equal to 6; m is 10 or more and 30 or less.
5. The apparatus of claim 4, wherein the current pretension obtaining module comprises an electric field strength obtaining module and a current pretension calculating module;
the electric field intensity acquisition module is used for acquiring the electric field intensity of an electric field generated by the piezoelectric ceramic crystal stack under the action of the current pretightening force;
the current pretightening force calculation module is used for calculating the current pretightening force of the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force of the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force.
6. The device of claim 4, further comprising an actual applied torque obtaining module, a torque difference value calculating module, a third judging module, a qualified product determining module and a defective product determining module;
the torque acquisition module is used for acquiring actual applied torque applied to the pre-tightening bolt;
the torque difference value calculating module is used for calculating the torque difference value of the actual applied torque and the reference applied torque;
the third judging module is used for judging whether the torque difference value is within a preset torque tolerance range;
the qualified product determining module is used for determining the piezoelectric ceramic crystal stack as a qualified product when the torque difference value is within the preset torque tolerance range;
and the defective product determining module is used for determining the piezoelectric ceramic crystal stack as a defective product when the torque difference value exceeds the preset torque tolerance range.
7. A pretensioning force application system of a piezoceramic ultrasonic transducer, which is characterized by comprising a motor, an intermediate connecting piece, a sampling circuit and a controller, wherein the controller comprises the pretensioning force application device of the piezoceramic ultrasonic transducer according to any one of claims 4 to 6;
the controller is respectively connected with the sampling circuit and the motor; the motor is connected with a pre-tightening bolt on the piezoelectric ceramic ultrasonic transducer through the middle connecting piece; the sampling circuit is connected with an electrode plate in a piezoelectric ceramic crystal stack on the piezoelectric ceramic ultrasonic transducer;
the intermediate connecting piece is used for transmitting the torque applied by the motor to the pre-tightening bolt so as to apply the torque to the pre-tightening bolt;
the sampling circuit is used for collecting the voltage at two ends of at least one piece of piezoelectric ceramic in the piezoelectric ceramic crystal stack and sending the voltage to the controller;
after the controller obtains the voltage, calculating the electric field intensity of an electric field generated by the at least one piece of piezoelectric ceramic corresponding to the voltage, and calculating the current pretightening force applied to the piezoelectric ceramic crystal stack according to the one-to-one correspondence relationship between the pretightening force of the piezoelectric ceramic crystal stack and the electric field intensity of the electric field generated under the action of the pretightening force; when the current pretightening force is smaller than a target pretightening force, controlling the motor to increase the torque applied to the pretightening bolt through the intermediate connecting piece so as to increase the pretightening force applied to the piezoelectric ceramic crystal stack until the difference between the current pretightening force applied to the piezoelectric ceramic crystal stack and the target pretightening force is smaller than a preset pretightening force tolerance;
the electric field intensity of the electric field generated by the piezoelectric ceramic crystal pile under the action of the pretightening force is the same as that of the electric field generated by any one piece of piezoelectric ceramic in the piezoelectric ceramic crystal pile under the action of the pretightening force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910122091.9A CN109820568B (en) | 2019-02-19 | 2019-02-19 | Pre-tightening force applying method, device and system of piezoelectric ceramic ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910122091.9A CN109820568B (en) | 2019-02-19 | 2019-02-19 | Pre-tightening force applying method, device and system of piezoelectric ceramic ultrasonic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109820568A CN109820568A (en) | 2019-05-31 |
| CN109820568B true CN109820568B (en) | 2020-08-21 |
Family
ID=66863628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910122091.9A Active CN109820568B (en) | 2019-02-19 | 2019-02-19 | Pre-tightening force applying method, device and system of piezoelectric ceramic ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109820568B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112570243A (en) * | 2019-09-30 | 2021-03-30 | 重庆西山科技股份有限公司 | Method and system for controlling pretightening force of ultrasonic transducer |
| CN111716573B (en) * | 2020-06-18 | 2021-06-04 | 浙江大学 | Ultrasonic knife handle capable of adjusting piezoelectric ceramic pretightening force in grading manner |
| CN115568910A (en) * | 2022-09-26 | 2023-01-06 | 河南翔宇医疗设备股份有限公司 | Method, device and equipment for optimizing ultrasonic debridement handle and readable storage medium |
| CN117224265A (en) * | 2023-09-05 | 2023-12-15 | 中山大学附属口腔医院 | Method and device for detecting stability of implant denture screw |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4127788A (en) * | 1977-07-08 | 1978-11-28 | Daugherty Ralph N | Piezoelectric stress indicator for mine roofs |
| JP4228149B2 (en) * | 2005-04-28 | 2009-02-25 | 忠弘 大見 | Screw member fastening method and screw member fastening device |
| TWI465705B (en) * | 2011-01-03 | 2014-12-21 | First Tools Ind Co Ltd | An automatic checking method and the device therefore |
| CN103423274B (en) * | 2013-08-27 | 2015-07-08 | 南车株洲电力机车研究所有限公司 | Method of guaranteeing fan high-strength bolt pretightening force to be accurately exerted |
| CN105258836A (en) * | 2015-10-27 | 2016-01-20 | 中国铁道科学研究院铁道建筑研究所 | System and method for monitoring state of bolt |
| CN105784249B (en) * | 2016-03-28 | 2019-01-29 | 北京理工大学 | A kind of measuring device and measuring method that helicitic texture torsion is established unprincipled connection |
| CN107192492B (en) * | 2017-04-20 | 2019-06-21 | 西北工业大学 | A kind of tools for bolts ' pretension torque supersonic guide-wave monitoring method based on improvement time reversal |
| CN108918014B (en) * | 2018-05-31 | 2023-05-26 | 河南理工大学 | Method and device for on-line monitoring and pre-tightening force application of sandwich type longitudinal vibration transducer assembly |
| CN208223719U (en) * | 2018-06-12 | 2018-12-11 | 中船重工海为郑州高科技有限公司 | A kind of strain gauge experimental rig |
-
2019
- 2019-02-19 CN CN201910122091.9A patent/CN109820568B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109820568A (en) | 2019-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109820568B (en) | Pre-tightening force applying method, device and system of piezoelectric ceramic ultrasonic transducer | |
| US8450644B2 (en) | Multi-mode ultrasonic welding control and optimization | |
| JP4274014B2 (en) | Conductive member and battery pack | |
| CN1787852A (en) | Ultrasound applying skin care device | |
| CN104012114A (en) | Ultrasonic vibration device, and ultrasonic medical apparatus | |
| US10005150B2 (en) | Method for manufacturing electronic device | |
| DeAngelis et al. | Optimizing piezoelectric stack preload bolts in ultrasonic transducers | |
| EP1928036A3 (en) | Ultrasonic motor and microscope stage | |
| CN105119524A (en) | Vibration energy collection device, terminal equipment and vibration energy collection method | |
| CA2563460A1 (en) | Battery safety device and battery having the same | |
| CN106205583A (en) | Piezo-activator and low-frequency underwater acoustic transducer | |
| US20170173634A1 (en) | Stretchable film laminate and electronic device | |
| CN102308468A (en) | Non-resonant energy harvesting devices and methods | |
| JP2002134804A (en) | Malfunction detector of piezoelectric actuator | |
| CN2289614Y (en) | Ultrasonic transducer | |
| CN205620362U (en) | A piezoelectric transducer for encouraging and receive non - disperse supersound guided wave | |
| CN205341214U (en) | Two excitation piezoelectricity ultrasonic transducer | |
| CN111641350A (en) | Flextensional transducer based on shearing piezoelectric mode | |
| JP2007160337A (en) | Ultrasonic welding device and control method therefor | |
| JP2003143697A (en) | Method of producing screw-fastened langevin vibrator | |
| JP3577350B2 (en) | Impact diagnosis device | |
| US9911911B2 (en) | Multiple electrode plane wave generator | |
| CN211243600U (en) | Ultrasonic transducer, ultrasonic probe and control system of pretightening force | |
| US9048762B1 (en) | Energy harvesting utilizing stress induced phase transformation in ferro-electric piezocrystals | |
| CN103138701A (en) | Electronic device and adjustment method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |