CN212653336U - Pretightening force device - Google Patents
Pretightening force device Download PDFInfo
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- CN212653336U CN212653336U CN202021523797.0U CN202021523797U CN212653336U CN 212653336 U CN212653336 U CN 212653336U CN 202021523797 U CN202021523797 U CN 202021523797U CN 212653336 U CN212653336 U CN 212653336U
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Abstract
The utility model provides a pretightening force device, which comprises a base, a supporting rod, a fixed head, a movable rod, an elastic part, a first fastener and a second fastener, wherein the supporting rod is fixed on the base, the fixed head is connected on the supporting rod in a sliding way and is positioned at one side of the base, the fixed head can be close to or far away from the base along the extending direction of the supporting rod, the movable rod is connected with the fixed head in a sliding way along the extending direction of the supporting rod and is parallel to the supporting rod, a testing station for placing a piezoelectric driver is formed between one end of the movable rod close to the base and the base, one end of the elastic part close to the fixed head is used for being abutted against the fixed head, one end of the elastic part far away from the fixed head is used for being abutted against the movable rod, the supporting rod is provided with scales for displaying the compression amount of the elastic part, the first fastener is used for locking, the pretightening force device has the advantages of simple structure and low cost.
Description
Technical Field
The utility model belongs to the technical field of piezoelectric actuator, more specifically say, relate to a pretightning force device.
Background
The piezoelectric actuator is a kind of element which utilizes the inverse piezoelectric effect to control the mechanical deformation of a piezoelectric body through an electric field so as to generate longitudinal linear motion, and is widely applied to the fields of aerospace, precision measurement, precision machining, medical instruments and the like. The piezoelectric actuator has a fast response speed under the action of voltage, but is difficult to quickly recover to an original state from an expansion state after the voltage is removed, so that the dynamic application of the piezoelectric actuator is greatly limited, and the existence of tensile stress enables the piezoelectric actuator to easily generate internal microcracks in the long-term use process, thereby influencing the service life of the piezoelectric actuator. Therefore, in the process of using or testing the piezoelectric driver, a certain pretightening force needs to be applied to counteract the tensile stress, so that the driver is driven to contract rapidly when the voltage is removed. At present, a plurality of pretightening force applying devices are applied, force application needs to be measured and controlled by matching with a force sensor, and the structural complexity and the use cost are increased.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a pretightning force device to solve the complicated and higher technical problem of cost of structure of the pretightning force device that exists among the prior art.
In order to achieve the above object, the utility model adopts the following technical scheme: providing a pretensioning device for a piezoelectric actuator, comprising:
a base;
the supporting rod is fixed on the base;
the fixing head is connected to the supporting rod in a sliding mode and located on one side of the base, and the fixing head can be close to or far away from the base along the extending direction of the supporting rod;
the moving rod is connected to the fixed head in a sliding mode along the extending direction of the supporting rod and is parallel to the supporting rod, and a testing station for placing the piezoelectric driver is formed between one end, close to the base, of the moving rod and the base;
the end, close to the fixed head, of the elastic piece is used for abutting against the fixed head, the end, far away from the fixed head, of the elastic piece is used for abutting against the movable rod, and the supporting rod is provided with scales used for displaying the compression amount of the elastic piece;
the first fastener is used for locking the moving rod on the fixed head; and
and the second fastener is used for locking the fixing head on the supporting rod.
In one embodiment, the fixed head is provided with a first through hole for the support rod to pass through and a second through hole for the moving rod to pass through, the support rod is slidably connected to the first through hole, and the moving rod is slidably connected to the second through hole.
In one embodiment, the movable rod includes a first sliding connection section slidably connected to the second through hole and an external threaded section connected to an end of the first sliding connection section away from the base and threadedly connected to the first fastening member disposed on a side of the fixed head away from the base.
In one embodiment, the first fastening member defines a through hole, and an inner wall of the through hole includes an internal thread section screwed to the external thread section and a second sliding connection section connected to an end of the internal thread section near the fixed head.
In one embodiment, a third through hole communicated with the first through hole is formed in the side surface of the fixing head, the second fastener is a threaded piece connected to the third through hole in a threaded manner, and one end of the second fastener extends into the first through hole after passing through the third through hole and abuts against the support rod.
In one embodiment, a first linear bearing is arranged in the first through hole and is used for being connected with the support rod in a sliding mode, and a second linear bearing is arranged in the second through hole and is used for being connected with the moving rod in a sliding mode.
In one embodiment, the elastic member is sleeved outside the moving rod.
In one embodiment, the resilient member is a spring
In one embodiment, a first insulating piece is arranged at one end of the moving rod close to the base, a second insulating piece is arranged on the base corresponding to the first insulating piece, and a testing station for placing the piezoelectric driver is formed between the first insulating piece and the second insulating piece seat.
In one embodiment, a surface finish of an end of the movable rod remote from the base is used to provide a displacement sensor for dynamically monitoring displacement characteristics of the piezoelectric actuator.
The utility model provides a pretightning force device's beneficial effect lies in: when the movable rod is used, the movable rod slides relative to the fixed head in the direction away from the base along the extension direction of the supporting rod, so that the elastic piece is in a compressed state, and then the movable rod is locked on the fixed head by adopting a first fastening piece; the piezoelectric driver is placed at a testing station, the fixing head slides relative to the supporting rod, and meanwhile, the moving rod is driven to move, so that one end, close to the base, of the moving rod is just abutted against the piezoelectric driver, and then the fixing head is locked on the supporting rod through a second fastening piece; and loosening the first fastener, and applying pretightening force to the piezoelectric driver by the movable rod under the action of the elastic force of the elastic piece. The utility model discloses a pretightning force device's elastic component's elasticity equals the pretightning force, and the elasticity coefficient of elastic component is known, is equipped with the scale that is used for showing the compressive capacity of elastic component on the bracing piece, can calculate the elasticity size of elastic component through reading the compressive capacity of elastic component and combining the elasticity coefficient of elastic component, compares with prior art, the utility model discloses a pretightning force device has saved force transducer, has effectively simplified the structure of pretightning force device, makes the utility model discloses a pretightning force device has low cost and convenient operation's advantage; furthermore, the utility model discloses a pretightning force device can also match displacement sensor, realizes that piezoelectric actuator detects at the dynamic displacement characteristic under the pretension state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic perspective view of a pretightening force device provided in an embodiment of the present invention;
fig. 2 is an exploded schematic view of a pretightening force device according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structural view of a first fastener provided in an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structural view of a fixing head provided in an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
110-a base; 120-a support bar; 130-a fixed head; 131-a first perforation; 1311-a first linear bearing; 132-a second perforation; 1321-a second linear bearing; 133-third perforation; 140-a travel bar; 141-a first sliding connection section; 142-an external threaded section; 150-an elastic member; 160-a first fastener; 161-via; 1611-an internal thread segment; 1612-second sliding connection section; 170-a second fastener; 181 — first insulator; 182-a second insulator; 190-testing station; 200-piezoelectric actuator.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 and 2, an embodiment of the present invention provides a pretightening force device for a piezoelectric actuator 200, including a base 110, a supporting rod 120, a fixing head 130, a moving rod 140, an elastic member 150, a first fastener 160 and a second fastener 170, wherein the supporting rod 120 is fixed on the base 110, and particularly, but not limited to, one end of the supporting rod 120 is fixed on the base 110; the fixing head 130 is slidably connected to the supporting rod 120 and located at one side of the base 110, and the fixing head 130 can be close to or far away from the base 110 along the extending direction of the supporting rod 120, so that the fixing head 130 can slide up and down along the supporting rod 120; the moving rod 140 is slidably connected to the fixed head 130 along the extending direction of the supporting rod 120 and is parallel to the supporting rod 120, so that the moving rod 140 can approach or depart from the base 110 relative to the fixed head 130 along the extending direction of the supporting rod 120, and a test station 190 for placing the piezoelectric driver 200 is formed between one end of the moving rod 140 close to the base 110 and the base 110; one end of the elastic member 150 close to the fixed head 130 is used for abutting against the fixed head 130, one end of the elastic member 150 far from the fixed head 130 is used for abutting against the movable rod 140, the compression amount of the elastic member 150 is adjusted by enabling the movable rod 140 to be close to or far from the base 110 relative to the fixed head 130 along the extension direction of the supporting rod 120, the compression amount refers to the compression change length of the elastic member 150, the supporting rod 120 is provided with scales for displaying the compression amount of the elastic member 150, and the elastic force of the elastic member 150 can be calculated according to the elastic coefficient of the elastic member 150; the first fastener 160 is used to lock the moving bar 140 to the fixing head 130, and the second fastener 170 is used to lock the fixing head 130 to the supporting bar 120. In this embodiment, the accuracy of the scale on the support rod 120 is 1mm, but of course, the accuracy of the scale may be adjusted appropriately according to the choice of the actual situation, and is not limited herein.
The utility model discloses pretightning force device application method is:
step (1), the movable rod 140 slides relative to the fixed head 130 in a direction away from the base 110 along the extending direction of the supporting rod 120, so that the elastic member 150 is in a compressed state, and then the movable rod 140 is locked on the fixed head 130 by using the first fastener 160;
step (2) the piezoelectric driver 200 is placed at the testing station 190, the fixing head 130 slides relative to the supporting rod 120, and meanwhile, the moving rod 140 is driven to move, so that one end, close to the base 110, of the moving rod 140 is just abutted against the piezoelectric driver 200, and then the fixing head 130 is locked on the supporting rod 120 through the second fastener 170;
step (3) the first fastening member 160 is loosened, and the movable rod 140 applies a pre-tightening force to the piezoelectric actuator 200 under the elastic force of the elastic member 150. The utility model discloses pretightning force device's elastic component 150's elasticity equals the pretightning force, and elastic component 150's coefficient of elasticity is known, is equipped with on the bracing piece 120 to be used for showing elastic component 150's compression volume's scale through reading elastic component 150's compression volume and combining elastic component 150's coefficient of elasticity can calculate elastic component 150's elasticity size, compares with prior art, the utility model discloses a force sensor has been omitted to the pretightning force device, has effectively simplified pretightning force device's structure, makes the utility model discloses a pretightning force device has low cost and convenient operation's advantage.
Further, as an embodiment of the present invention, as shown in fig. 2 and 4, the fixing head 130 is provided with a first through hole 131 for the support rod 120 to pass through and a second through hole 132 for the movable rod 140 to pass through, the support rod 120 is slidably connected to the first through hole 131, and the movable rod 140 is slidably connected to the second through hole 132, so that the fixing head 130 is slidably connected to the support rod 120 and the movable rod 140 respectively. It is understood that the fixed head 130 may be slidably connected to the support bar 120 and the movable bar 140 by other means according to the choice of actual conditions and the specific requirements, and is not limited thereto.
Further, as an embodiment of the present invention, as shown in fig. 2 and 3, the moving rod 140 includes a first sliding connection section 141 slidably connected to the second through hole 132 and an external thread section 142 connected to an end of the first sliding connection section 141 away from the base 110 and threadedly connected to the first fastening member 160, and the first fastening member 160 is disposed on a side of the fixing head 130 away from the base 110, so that the first fastening member 160 can lock the moving rod 140 to the fixing head 130. In this embodiment, in the natural state of the elastic member 150, i.e., in the state where the elastic member 150 is not compressed or stretched, the external threaded section 142 of the moving rod 140 is located on the side of the fixed head 130 away from the base 110, and the first fastener 160 is threadedly coupled to the external threaded section 142 of the moving rod 140 and the surface of the first fastener 160 near the fixed head 130 abuts against the fixed head 130. It will be appreciated that the first fastener 160 may lock the travel bar 140 to the fixed head 130 in other ways, as the case may be and as the case may be, and is not limited solely thereto.
Further, as an embodiment of the present invention, the length of the external thread section 142 of the movable rod 140 should be greater than the maximum compression amount of the elastic member 150, so as to increase the adjustment range of the elasticity (pre-tightening force) of the elastic member 150. Of course, the length of the external thread section 142 of the moving rod 140 can be adjusted appropriately according to the choice of actual conditions and the specific requirements, and is not limited herein.
Further, as a specific embodiment of the present invention, as shown in fig. 2 and fig. 4, a first linear bearing 1311 for slidably connecting with the support rod 120 is disposed in the first through hole 131, a second linear bearing 1321 for slidably connecting with the first sliding connection section 141 of the moving rod 140 is disposed in the second through hole 132, and the first linear bearing 1311 and the second linear bearing 1321 may be, but not limited to, rolling bearings, so that the fixing head 130 is slidably connected to the support rod 120 and the moving rod 140, respectively. In this embodiment, the side surfaces of the support rod 120 and the surface of the first sliding coupling section 141 of the moving rod 140 are smooth, so that the fixed head 130 can smoothly slide on the support rod 120 and the moving rod 140 can smoothly slide on the fixed head 130.
Further, as a specific embodiment of the present invention, as shown in fig. 2 and fig. 3, the first fastener 160 has a through hole 161, the through hole 161 is disposed through the first fastener 160 along the extending direction of the moving rod 140, the inner wall of the through hole 161 includes an internal thread section 1611 screwed to the external thread section 142 and a second sliding connection section 1612 connected to one end of the internal thread section 1611 close to the fixing head 130, and the first sliding connection section 141 of the moving rod 140 is slidably connected to the second sliding connection section 1612 of the through hole 161. In this embodiment, the first fastening member 160 may be, but is not limited to, 5cm, and the surface of the second sliding coupling section 1612 is smooth, so that the sliding between the first sliding coupling section 141 of the moving bar 140 and the second sliding coupling section 1612 of the through hole 161 is smoother.
Further, as a specific embodiment of the present invention, the length of the second sliding connection section 1612 of the through hole 161 should be greater than the maximum compression amount of the elastic member 150, so as to ensure the adjustment range of the elastic force (pretightening force) of the elastic member 150. Of course, the length of the external thread section 142 of the moving rod 140 can be adjusted appropriately according to the choice of actual conditions and the specific requirements, and is not limited herein.
Further, as a specific embodiment of the present invention, as shown in fig. 2 and fig. 4, a third through hole 133 communicating with the first through hole 131 is formed in a side surface of the fixing head 130, the second fastening member 170 is a screw member screwed in the third through hole 133, and one end of the second fastening member 170 passes through the third through hole 133 and the first linear bearing 1311 and then extends into the first through hole 131 and abuts against the supporting rod 120, so that the fixing head 130 can be locked on the supporting rod 120 by the second fastening member 170. It is understood that the second fastener 170 may be used to lock the fixing head 130 to the support rod 120 in other ways according to the choice of actual conditions and specific requirements, and is not limited herein.
Further, as a specific embodiment of the present invention, as shown in fig. 1 and fig. 2, the elastic member 150 is sleeved outside the first sliding connection section 141 of the moving rod 140, in the pretightening force device of the embodiment of the present invention, the elastic member 150 may be a spring, and the diameter of the moving rod 140 is slightly smaller than the diameter of the spring, so as to conveniently sleeve the spring on the first sliding connection section 141 of the moving rod 140. Of course, the specific arrangement and specific structure of the elastic member 150 can be adjusted according to the choice and specific requirements of the actual situation, and is not limited herein.
Further, as an embodiment of the present invention, in order to ensure the accuracy of measuring the elastic force of the spring, the compression amount of the spring should be less than or equal to 1/2 of the length of the spring, accordingly, the length of the external thread section 142 of the moving rod 140 should be greater than the maximum compression amount of the elastic member 150, and the length of the second sliding connection section 1612 of the through hole 161 should be greater than the maximum compression amount of the elastic member 150, that is, the length of the external thread section 142 of the moving rod 140 and the length of the second sliding connection section 1612 of the through hole 161 are both greater than 1/2 of the length of the spring.
The utility model discloses among the pretightning force device, the length of spring is 60mm ~ 100mm, and the elastic coefficient is 10N/mm ~ 30N/mm, 1/2 of the length of compressive quantity less than or equal to spring, the compressive quantity can be 10mm ~ 30mm particularly, for example, the length of spring is 80mm, and the internal diameter is 11mm, and the external diameter is 22mm, and the elastic coefficient is 20.6N/mm, and the compressive quantity scope of spring is 10mm ~ 30mm, and corresponding pretightning force (elasticity) is 206N ~ 618N. It is understood that the specific parameters of the spring can be properly adjusted according to the selection of the actual situation and the specific requirements, and are not limited herein.
Further, as a specific embodiment of the present invention, as shown in fig. 1, one end of the moving rod 140 close to the base 110 is provided with a first insulating member 181, the base 110 is provided with a second insulating member 182 corresponding to the first insulating member 181, the first insulating member 181 and the second insulating member 182 can be, but are not limited to, an alumina ceramic block, a testing station 190 for placing the piezoelectric driver 200 is formed between the first insulating member 181 and the second insulating member 182, one surface of the first insulating member 181 far away from the moving rod 140 is polished to be smooth and flat, one surface of the second insulating member 182 far away from the base 110 is polished to be smooth and flat, and the surface stress of the piezoelectric driver 200 is prevented from being unbalanced. With this structure, the moving rod 140 can be prevented from contacting the positive and negative electrodes of the piezoelectric actuator 200 to cause a short circuit.
Further, as an embodiment of the present invention, the surface of the external thread section 142 of the movable rod 140, which is far away from the base 110, is polished and used to provide a displacement sensor (not shown), which is used to dynamically monitor the dynamic displacement characteristics of the piezoelectric actuator 200 in the pre-tightening state.
Please refer to fig. 1-4, an embodiment of the present invention further provides a method for adjusting a pretightening force device, where the method for adjusting the pretightening force device includes:
step S1, presetting a pretightening force, and calculating a magnitude of the compression amount of the elastic member 150, where the calculation formula of the compression amount of the elastic member 150 is:
wherein D is the compression amount of the elastic member 150, G is the pretightening force, and K is the elastic coefficient of the elastic member 150;
step S2, referring to the scales on the supporting rod 120, making the movable rod 140 slide relative to the fixed head 130 in the direction away from the base 110 along the extending direction of the supporting rod 120, and the elastic member 150 is in a compressed state corresponding to the amount of compression, and the movable rod 140 is locked on the fixed head 130 by the first fastening member 160;
step S3, placing the piezoelectric driver 200 in the testing station 190, and sliding the fixed head 130 relative to the supporting rod 120 while driving the movable rod 140 to move, so that one end of the movable rod 140 close to the base 110 abuts against the piezoelectric driver 200, and locking the fixed head 130 to the supporting rod 120 by using the second fastener 170;
step S4, the first fastening member 160 is loosened, and the movable rod 140 applies a pre-load force to the piezoelectric actuator 200 under the elastic force of the elastic member 150. In step S1, the elastic member 150 may be a standard commercially available member, such as a spring, whose elastic coefficient is known; of course, the elastic member 150 may be other structural members according to the actual choice and specific requirements, so long as the elastic coefficient of the elastic member 150 is measured during the production process of the pretensioning device, that is, the elastic coefficient of the elastic member 150 is a known quantity.
The utility model discloses pretightning force device adjustment method adopts above-mentioned pretightning force device to exert certain pretightning force to piezoelectric actuator 200, and above-mentioned pretightning force device's simple structure, and can measure and control exerting force.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A pretensioning device for a piezoelectric actuator, comprising:
a base;
the supporting rod is fixed on the base;
the fixing head is connected to the supporting rod in a sliding mode and located on one side of the base, and the fixing head can be close to or far away from the base along the extending direction of the supporting rod;
the moving rod is connected to the fixed head in a sliding mode along the extending direction of the supporting rod and is parallel to the supporting rod, and a testing station for placing the piezoelectric driver is formed between one end, close to the base, of the moving rod and the base;
the end, close to the fixed head, of the elastic piece is used for abutting against the fixed head, the end, far away from the fixed head, of the elastic piece is used for abutting against the movable rod, and the supporting rod is provided with scales used for displaying the compression amount of the elastic piece;
the first fastener is used for locking the moving rod on the fixed head; and
and the second fastener is used for locking the fixing head on the supporting rod.
2. The preload device as in claim 1, wherein said fixed head has a first aperture through which said support rod passes and a second aperture through which said movable rod passes, said support rod being slidably coupled to said first aperture and said movable rod being slidably coupled to said second aperture.
3. The pretension device of claim 2, wherein the movable rod includes a first sliding connection section slidably connected to the second through hole and an externally threaded section connected to an end of the first sliding connection section remote from the base and threadedly connected to the first fastener, the first fastener being disposed on a side of the fixed head remote from the base.
4. The pretensioning device of claim 3, wherein the first fastener has a through hole, and an inner wall of the through hole includes an internal threaded section that is threadedly coupled to the external threaded section and a second sliding coupling section that is coupled to an end of the internal threaded section adjacent to the fixed head.
5. The pretensioning device of claim 2, wherein a third through hole communicated with the first through hole is formed in a side surface of the fixing head, the second fastening member is a threaded member threadedly connected to the third through hole, and one end of the second fastening member extends into the first through hole after passing through the third through hole and abuts against the support rod.
6. The preload device as in claim 2, wherein a first linear bearing is disposed in said first bore for slidably coupling with said support rod, and a second linear bearing is disposed in said second bore for slidably coupling with said travel rod.
7. The preload device of claim 1, wherein the spring member is disposed around the movable rod.
8. The preload device of claim 7, wherein the resilient member is a spring.
9. The preload apparatus as claimed in any one of claims 1 to 8, wherein an end of said movable rod adjacent to said base is provided with a first insulator, said base is provided with a second insulator corresponding to said first insulator, and a test station for placing said piezoelectric actuator is formed between said first insulator and said second insulator.
10. The preload device of any one of claims 1 through 8, wherein a surface finish of an end of the movable rod remote from the base is used to provide a displacement sensor for dynamically monitoring a displacement characteristic of the piezoelectric actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021523797.0U CN212653336U (en) | 2020-07-28 | 2020-07-28 | Pretightening force device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021523797.0U CN212653336U (en) | 2020-07-28 | 2020-07-28 | Pretightening force device |
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| Publication Number | Publication Date |
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| CN212653336U true CN212653336U (en) | 2021-03-05 |
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| CN202021523797.0U Active CN212653336U (en) | 2020-07-28 | 2020-07-28 | Pretightening force device |
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| CN (1) | CN212653336U (en) |
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