Screw joint piece capable of controlling clamping force

Abstract

The invention provides a screwing piece capable of controlling clamping force, which comprises a first connecting piece, a second connecting piece, a third connecting piece and a fourth connecting piece, the second connecting piece comprises threaded holes corresponding to the threaded mounting holes; wherein the screw joint mounting hole is matched and connected with the threaded hole, and the first connecting piece is in screw joint with the second connecting piece; the at least one piezoelectric stack is arranged between the first connecting piece and the second connecting piece, and one piezoelectric stack is arranged corresponding to each threaded hole; and the control module is electrically connected with the at least one piezoelectric stack and outputs a corresponding electric signal to the at least one piezoelectric stack, so that the volume of the piezoelectric stack is correspondingly changed, the clamping force between the first connecting piece and the second connecting piece is changed, the clamping force between the first connecting piece and the second connecting piece is accurately controlled, and the clamping force between the first connecting piece and the second connecting piece is accurately controlled. Therefore, the problems that in the prior art, a clamping force control mode generally has the defects of being high in cost, difficult to achieve, low in control precision and the like are solved.

Description

Technical Field

[0001] The invention relates to the field of mechanical assembly of precision products, and in particular to a screw connection component for controlling clamping force. Background Art

[0002] Clamping force refers to the pressure generated by tightening a bolt or screw during the threaded assembly process, which is used to firmly connect the connectors together. The magnitude of this force directly affects the stability and safety of the assembly. Traditional methods of controlling clamping force mainly include changing the model and material of threaded fasteners, using different types of lubricants, changing the size of preload, etc. These methods generally have disadvantages such as high cost, difficulty in implementation, and low control accuracy. Summary of the invention

[0003] The object of the present invention is to provide a screw connection for controlling the clamping force, so as to solve the problems that the methods for controlling the clamping force in the prior art generally have the disadvantages of high cost, difficulty in realization, low control accuracy and the like.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a screw connection for controlling the clamping force, which includes:

[0005] A first connecting member including at least one threaded mounting hole;

[0006] A second connecting member includes a threaded hole corresponding to each of the threaded mounting holes; wherein the threaded mounting holes and the threaded holes are cooperatively connected, and the first connecting member is threadedly connected to the second connecting member;

[0007] At least one piezoelectric stack is disposed between the first connecting member and the second connecting member, and one piezoelectric stack is disposed corresponding to each threaded hole;

[0008] The control module is electrically connected to the at least one piezoelectric stack and outputs a corresponding electrical signal to the at least one piezoelectric stack, so that the volume of the piezoelectric stack changes accordingly, thereby changing the clamping force between the first connecting member and the second connecting member.

[0009] Optionally, in the screw connection, the second connecting member is provided with an annular groove coaxial with the threaded hole, and the piezoelectric stack is arranged in the annular groove.

[0010] Optionally, the screw connector further comprises a wire connected to the piezoelectric stack and the control module respectively; the second connector is further provided with a wire hole;

[0011] One end of the wire hole is located in the annular groove; the wire is arranged in the wire hole.

[0012] Optionally, in the screw connection, the control module is electrically connected to a detection device, obtains shape and position parameters from the detection device, and outputs corresponding electrical signals to the at least one piezoelectric stack;

[0013] Wherein, the detection device is arranged on a side of the first connecting member away from the second connecting member, and is used to detect shape and position parameters of the first connecting member.

[0014] Optionally, in the screw connector, the shape and position parameters include one or more of the following:

[0015] Straightness;

[0016] Flatness;

[0017] Roundness;

[0018] Coaxiality;

[0019] Parallelism;

[0020] Verticality;

[0021] Tilt.

[0022] Optionally, the screw connection, wherein the detection equipment comprises: a bracket, a measuring instrument and a data collector;

[0023] Wherein, the bracket includes a accommodating space; wherein, the measuring instrument, the first connecting member and the second connecting member are arranged in the accommodating space, and the measuring instrument is fixedly connected to the bracket; the measuring instrument is used to measure the shape and position parameters of the first connecting member; the data acquisition device is electrically connected to the control module and the measuring instrument respectively, and sends the shape and position parameters collected from the measuring instrument to the control module.

[0024] Optionally, the screw-in component, wherein the control module includes a control algorithm module and an electrical signal output module; wherein the control algorithm module is used to generate a corresponding control signal according to the shape and position parameters; the electrical signal output module is used to generate the corresponding electrical signal according to the control signal sent by the control algorithm module, and output it to the piezoelectric stack.

[0025] The beneficial effects of the above technical solution of the present invention are as follows:

[0026] In the above scheme, a piezoelectric stack connected to a control module is arranged corresponding to each bolt or screw installation point of the threaded first connecting member and the second connecting member, and a corresponding electrical signal is sent to the piezoelectric stack through the control module. The electrical signals corresponding to the multiple piezoelectric stacks may be the same or different, thereby causing the volumes of the piezoelectric stacks to change in the same or different ways, thereby achieving precise control of the clamping force between the first connecting member and the second connecting member, thereby solving the problems of high cost, difficulty in implementation, low control accuracy and other common shortcomings of the prior art methods of controlling the clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 One of the schematic diagrams of the screw connection member and the detection device for controlling the clamping force according to the embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a second connecting member of a screw connection member for controlling a clamping force according to an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of a bolt hole of a second connecting member of a threaded connection member for controlling clamping force according to an embodiment of the present invention;

[0030] Figure 4 for Figure 3 A half-section view of

[0031] Figure 5 This is a second schematic diagram of a screw connection member and a detection device for controlling clamping force according to an embodiment of the present invention;

[0032] Figure 6 This is the third schematic diagram of the screw connection and the detection device for controlling the clamping force according to the embodiment of the present invention.

[0033] Explanation of symbols:

[0034] 100 - piezoelectric stack; 200 - first connecting member; 300 - second connecting member; 310 - annular groove; 320 - wire hole; 400 - measuring instrument; 500 - data acquisition device; 600 - bracket; 710 - control algorithm module; 720 - electrical signal output module. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention aims at the problems that the methods for controlling the clamping force in the prior art generally have the disadvantages of high cost, difficulty in realization, low control precision and the like, and provides a screw connection for controlling the clamping force.

[0037] like Figure 1 As shown, an embodiment of the present invention provides a screw connection member for controlling a clamping force, which includes:

[0038] The first connecting member 200 includes at least one threaded mounting hole;

[0039] The second connecting member 300 comprises a threaded hole corresponding to each of the threaded mounting holes; wherein the threaded mounting holes and the threaded holes are cooperatively connected, and the first connecting member 200 is threadedly connected to the second connecting member 300;

[0040] At least one piezoelectric stack 100 is disposed between the first connecting member 200 and the second connecting member 300, and one piezoelectric stack 100 is disposed corresponding to each threaded hole;

[0041] The control module is electrically connected to the at least one piezoelectric stack 100 and outputs a corresponding electrical signal to the at least one piezoelectric stack 100, so that the volume of the piezoelectric stack 100 changes accordingly, thereby changing the clamping force between the first connecting member 200 and the second connecting member 300.

[0042] In this embodiment, the first connecting member 200 and the second connecting member 300 are screwed together, and a piezoelectric stack 100 connected to the control module is correspondingly arranged at each bolt or screw installation point. The corresponding electrical signal is sent to the piezoelectric stack 100 through the control module. The electrical signals corresponding to the multiple piezoelectric stacks 100 can be the same or different, so that their volumes undergo the same or different changes, thereby achieving precise control of the clamping force of the mating surfaces of the first connecting member 200 and the second connecting member 300, thereby solving the problems of high cost, difficulty in implementation, low control accuracy and other common disadvantages of the prior art methods of controlling the clamping force.

[0043] Optionally, in the screw connection, the second connection member 300 is provided with an annular groove 310 coaxial with the threaded hole, and the piezoelectric stack 100 is disposed in the annular groove 310 .

[0044] In this embodiment, if Figure 2 As shown, a plurality of threaded holes are provided on the second connecting member 300, wherein each threaded hole is as shown in FIG. Figure 3 As shown, the annular groove 310 coaxial therewith is provided, and the piezoelectric stack 100 is arranged in the annular groove 310, which can uniformly change the clamping force corresponding to one circle around the threaded hole when the volume of the piezoelectric stack 100 changes.

[0045] Optionally, the screw connector further comprises a wire connected to the piezoelectric stack 100 and the control module respectively; the second connector 300 is further provided with a wire hole 320;

[0046] One end of the wire hole 320 is located in the annular groove 310 ; the wire is arranged in the wire hole 320 .

[0047] In this embodiment, the piezoelectric stack 100 and the control module are connected by the wire, so as to achieve the purpose of controlling the electric field applied to the piezoelectric stack 100. In order to facilitate the insertion of the wire, the second connecting member 300 is provided with the wire hole 320 for inserting the wire. Figure 3 and Figure 4 As shown, one end of the wire hole 320 is disposed in the annular groove 310, so that the wire is hidden in the second connecting member 300. The other end of the wire hole 320 is as shown in FIG. Figure 1 As shown, it is arranged on the end surface adjacent to the end surface where the annular groove 310 is located, so as to facilitate the connection between the wire and the control module.

[0048] Optionally, in the screw connection, the control module is electrically connected to a detection device, obtains shape and position parameters from the detection device, and outputs corresponding electrical signals to the at least one piezoelectric stack 100;

[0049] The detection device is disposed on a side of the first connecting member 200 away from the second connecting member 300 , and is used to detect shape and position parameters of the first connecting member 200 .

[0050] In this embodiment, if Figure 1 As shown, the control module is electrically connected to the detection device, and the shape and position parameters are obtained through the detection device, so that the screw connection effect of the first connecting member 200 and the second connecting member 300 can be known, and the electrical signal output to the piezoelectric stack 100 at different positions is controlled according to the shape and position parameters. The volumes of multiple piezoelectric stacks 100 may be the same or different. The control module comprehensively controls the volume of at least one piezoelectric stack 100 to achieve precise control of the clamping force of the mating surfaces of the first connecting member 200 and the second connecting member 300.

[0051] It should be noted that an embodiment of the present invention also provides an example in which the detection device is not connected, by manually inputting the deformation direction and magnitude of the piezoelectric stack 100 into the control component, outputting the electrical signal that causes the piezoelectric stack 100 to achieve the deformation in the direction and magnitude, and continuously outputting the electrical signal to remain constant after the deformation is completed, so that the clamping force of the mating surfaces of the first connecting member 200 and the second connecting member 300 maintains the required magnitude.

[0052] Optionally, in the screw connector, the shape and position parameters include one or more of the following:

[0053] Straightness;

[0054] Flatness;

[0055] Roundness;

[0056] Coaxiality;

[0057] Parallelism;

[0058] Verticality;

[0059] Tilt.

[0060] In this embodiment, the shape and position parameters are used to ensure that the first connector 200 and the second connector 300 can be correctly positioned and matched with each other during assembly. The shape and position parameters obtained by the detection device can accurately control the clamping force of the mating surface of the first connector 200 and the second connector 300. For example, if the verticality in the shape and position parameters is greater than the tolerance, it is necessary to combine the inclination of the position of the screw-connected mounting holes on the first connector 200 to determine which piezoelectric stack 100 needs to be increased and which piezoelectric stack 100 needs to be reduced, thereby achieving low-cost and accurate control of the clamping force of the mating surface of the first connector 200 and the second connector 300.

[0061] Optionally, the screw connection, wherein the detection device comprises: a bracket 600, a measuring instrument 400 and a data collector 500;

[0062] Wherein, the bracket 600 includes a accommodating space; wherein, the measuring instrument 400, the first connecting member 200 and the second connecting member 300 are arranged in the accommodating space, and the measuring instrument 400 is fixedly connected to the bracket 600; the measuring instrument 400 is used to measure the shape and position parameters of the first connecting member 200; the data acquisition device 500 is electrically connected to the control module and the measuring instrument 400, respectively, and sends the shape and position parameters collected from the measuring instrument 400 to the control module.

[0063] In this embodiment, if Figure 5 and Figure 6 As shown, the measuring instrument 400, the first connecting member 200 and the second connecting member 300 are arranged in the accommodating space of the bracket 600, and the measuring instrument 400 is connected to the top of the bracket 600, so as to facilitate the acquisition of the shape and position parameters of the first connecting member 200, and is more conducive to controlling the clamping force of the mating surfaces of the first connecting member 200 and the second connecting member 300.

[0064] Optionally, the screw connection, wherein the control module includes a control algorithm module 710 and an electrical signal output module 720; wherein the control algorithm module 710 is used to generate a corresponding control signal according to the shape and position parameters; the electrical signal output module 720 is used to generate the corresponding electrical signal according to the control signal sent by the control algorithm module 710, and output it to the piezoelectric stack 100.

[0065] In this embodiment, if Figure 6 As shown, the control algorithm module 710 generates the control signal for the electrical signal output module 720 according to the shape and position parameters sent by the data collector 500, and the electrical signal output module 720 outputs the corresponding electrical signal to the piezoelectric stack 100 according to the control signal, so that one or more piezoelectric stacks 100 between the first connector 200 and the second connector 300 produce the same or different deformations, thereby accurately controlling the clamping force of the threaded mating surface.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A screw connection for controlling clamping force, characterized in that: include: A first connecting member (200) comprising at least one threaded mounting hole; The second connecting member (300) comprises a threaded hole corresponding to each of the threaded mounting holes; wherein the threaded mounting holes and the threaded holes are cooperatively connected, and the first connecting member (200) and the second connecting member (300) are threadedly connected; At least one piezoelectric stack (100) is disposed between the first connecting member (200) and the second connecting member (300), and one piezoelectric stack (100) is disposed corresponding to each threaded hole; A control module is electrically connected to the at least one piezoelectric stack (100) and outputs a corresponding electrical signal to the at least one piezoelectric stack (100), so that the volume of the piezoelectric stack (100) changes accordingly, thereby changing the clamping force between the first connecting member (200) and the second connecting member (300).

2. The screw connection according to claim 1, characterized in that: The second connecting member (300) is provided with an annular groove (310) coaxial with the threaded hole, and the piezoelectric stack (100) is arranged in the annular groove (310).

3. The screw connection according to claim 2, characterized in that: The screw connection also includes a wire connected to the piezoelectric stack (100) and the control module respectively; the second connection member (300) is also provided with a wire hole (320); One end of the wire hole (320) is located in the annular groove (310); and the wire is arranged in the wire hole (320).

4. The screw connection according to claim 1, characterized in that: The control module is electrically connected to the detection device, obtains shape and position parameters from the detection device, and outputs corresponding electrical signals to the at least one piezoelectric stack (100); Wherein, the detection device is arranged on a side of the first connecting member (200) away from the second connecting member (300), and is used to detect shape and position parameters of the first connecting member (200).

5. The screw connection according to claim 4, characterized in that: The shape and position parameters include one or more of the following: Straightness; Flatness; Roundness; Coaxiality; Parallelism; Verticality; Tilt.

6. The screw connection according to claim 4, characterized in that: The detection device comprises: a bracket (600), a measuring instrument (400) and a data collector (500); The bracket (600) comprises a containing space; the measuring instrument (400), the first connecting member (200) and the second connecting member (300) are arranged in the containing space, and the measuring instrument (400) is fixedly connected to the bracket (600); the measuring instrument (400) is used to measure the shape and position parameters of the first connecting member (200); and the data acquisition device (500) is electrically connected to the control module and the measuring instrument (400) respectively, and sends the shape and position parameters collected from the measuring instrument (400) to the control module.

7. The screw connection according to claim 6, characterized in that: The control module comprises a control algorithm module (710) and an electrical signal output module (720); wherein the control algorithm module (710) is used to generate a corresponding control signal according to the shape and position parameters; and the electrical signal output module (720) is used to generate the corresponding electrical signal according to the control signal sent by the control algorithm module (710), and output it to the piezoelectric stack (100).

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