CN222420280U - Floating head structure and test device - Google Patents

Abstract

The utility model relates to a floating head structure and a testing device, which comprises a main body, an elastic sheet, a piston, at least one piston sleeve, a piston and an elastic sheet, wherein the elastic sheet is arranged on the main body, a first air flow channel for air flow to the elastic sheet is arranged on the main body, the piston and the at least one piston sleeve are axially movably arranged on the main body, the piston is sleeved outside the piston, when the floating head structure comprises the piston sleeve, the radial dimension of the piston can be adjusted to expand or separate from the piston sleeve, when the floating head structure comprises at least two piston sleeves sleeved outside the piston layer by layer, the radial dimension of the piston can be adjusted to expand or separate from the piston sleeve positioned at the innermost layer, the radial dimension of the piston sleeve positioned at the inner layer can be adjusted to expand or separate from the piston sleeve positioned at the outer layer, when the piston and the at least one piston sleeve are expanded, the elastic sheet can exert acting force on the piston or the combined body under the action of air flow, and the floating head structure can exert pressure on a piece to be tested through the piston.

Description

Floating head structure and testing device

Technical Field

The present utility model relates to the field of testing technologies, and in particular, to a floating head structure and a testing device.

Background

With the continuous development of technology, electronic components (such as ICs) are increasingly used. Before leaving the factory, the electronic components need to be subjected to performance test to ensure that the quality of the electronic components meets the standard requirements.

The area to be pressed of the electronic component has different numbers of pins, the pins need to be conducted with the test seat during the press-connection test, and the process needs to provide a pressing force by the floating head structure. The amount of pressing force required for the electronic component is related to the number of pins, and when the number of pins is different, the amount of pressing force required is also different.

In the conventional technology, each floating head structure can only provide one downward force, and when electronic components of different types or specifications need to be tested, the floating head structure needs to be replaced frequently. Thus, not only the equipment cost is increased but also the test efficiency is lowered.

Disclosure of utility model

Accordingly, it is necessary to provide a floating head structure and a testing apparatus capable of reducing the equipment cost and improving the testing efficiency, aiming at the problems of high cost and low testing efficiency caused by frequent replacement of the floating head structure when testing electronic components of different types or specifications in the conventional technology.

A floating head structure for holding a part to be measured, comprising:

A main body;

The elastic sheet is arranged on the main body, and a first airflow channel for enabling air to flow to the elastic sheet is arranged on the main body;

The floating head structure comprises at least two piston sleeves sleeved outside the piston layer by layer, wherein the size of the piston in the radial direction is adjustable to be capable of being expanded with or separated from the piston sleeve, the size of the piston in the radial direction is adjustable to be capable of being expanded with or separated from the piston sleeve in the innermost layer, and the size of the piston sleeve in the radial direction is adjustable to be capable of being expanded with or separated from the piston sleeve in the outer layer in every two adjacent layers;

The elastic sheet can apply acting force to the piston or the combination under the action of the air flow, and the floating head structure applies pressure to the to-be-detected piece through the piston.

In one embodiment, the main body comprises a first cover plate and a second cover plate, the elastic sheet is clamped between the first cover plate and the second cover plate, the first air flow channel is arranged on the first cover plate, and a containing cavity is formed between the elastic sheet and the second cover plate;

The piston comprises a first part and a second part which are mutually connected in the axial direction, the first part and the piston sleeve are both positioned in the accommodating cavity, one end, far away from the first part, of the second part in the axial direction penetrates out through the second cover plate, and the diameter of the first part is larger than that of the second part, so that the first part is limited in the accommodating cavity.

In one embodiment, the piston or the piston sleeve in the inner layer includes an acting portion and a telescoping portion connected to each other, the acting portion being capable of exerting a force on the telescoping portion to cause the telescoping portion to expand in the radial direction, thereby causing the size of the piston or the piston sleeve in the inner layer to increase in the radial direction.

In one embodiment, the acting part comprises an inflatable shaft, the telescopic part comprises an inflatable key and a retainer, the retainer is sleeved outside the inflatable shaft, one end of the inflatable key is propped against the inflatable shaft, and the other end of the inflatable key is penetrated in the retainer;

The second air flow channel is arranged in the air expansion shaft, the second air flow channel supplies air flow to the air expansion shaft, the air expansion shaft can expand under the action of the air flow to apply acting force to the air expansion key, and the air expansion key moves outwards relative to the retainer, so that the size of the piston or the piston sleeve at the inner layer in the radial direction is increased.

In one embodiment, the expansion and contraction part comprises at least two inflatable keys, and all the inflatable keys penetrate through the retainer at intervals along the circumferential direction of the piston.

In one embodiment, the acting part comprises a first moving part, the telescopic part comprises an annular part, the annular part is provided with a first groove at least one end of the piston in the axial direction, and the first moving part is arranged in the annular part;

The first moving portion is movable in the annular portion in the axial direction to expand or retract the annular portion under the action of the inclined surface.

In one embodiment, the annular portion is provided with first grooves at two ends in the axial direction, and the first grooves at two ends are sequentially and uniformly distributed in a staggered manner.

In one embodiment, the acting portion comprises a second moving portion, the telescopic portion comprises a connecting portion, and the second moving portion is hinged with the connecting portion;

When the second moving part moves along the axial direction of the piston, the connecting part can be driven to extend or retract in the radial direction.

In one embodiment, the connecting part comprises a first connecting part and a second connecting part, and the first connecting part and the second connecting part are respectively hinged with the second moving part through connecting rods;

The first connecting portion and the second connecting portion can be moved toward or away from each other in the radial direction when the second moving portion moves in the axial direction of the piston.

The testing device comprises a feeding mechanism, a testing mechanism, a receiving mechanism and a conveying mechanism, wherein the testing mechanism comprises a testing seat and the floating head structure, the conveying mechanism is used for conveying a piece to be tested provided by the feeding mechanism to the testing seat, the floating head structure applies pressure to the piece to be tested on the testing seat through a piston, and the conveying mechanism is used for conveying the piece to be tested on the testing seat to the receiving mechanism for receiving materials.

The floating head structure and the testing device comprise the piston and at least one piston sleeve, when the piston is not tightly expanded with the piston sleeve, the piston can provide first pressure for the to-be-tested piece, and when the piston is tightly expanded with the at least one piston sleeve, the piston can provide second pressure for the to-be-tested piece, and the second pressure is larger than the first pressure. Therefore, the piston and the piston sleeve can be controlled to be expanded or separated according to different types or specifications of the to-be-detected pieces, and the floating head structure can provide pressure adapting to the to-be-detected pieces. Compared with a floating head structure capable of providing only one pressure in the prior art, the floating head structure provided by the embodiment of the application can provide different pressures, avoids frequent replacement of the floating head structure, reduces equipment cost and improves test efficiency.

Drawings

FIG. 1 is an isometric view of a floating head structure according to one embodiment of the present application;

FIG. 2 is a top view of the floating head structure shown in FIG. 1;

FIG. 3 is a cross-sectional view of the A-A face of the floating head structure shown in FIG. 2;

FIG. 4 is a cross-sectional view of the B-B side of the floating head structure shown in FIG. 2;

FIG. 5 is an exploded view of a piston or inner piston sleeve of the floating head structure shown in FIG. 1;

FIG. 6 is an assembly view of the structure shown in FIG. 5;

FIG. 7 is an exploded view of a piston or inner piston sleeve of a floating head construction according to another embodiment of the present application;

FIG. 8 is an isometric view of a piston or inner piston sleeve of a floating head construction according to yet another embodiment of the present application;

fig. 9 is a front view of the structure shown in fig. 8.

Reference numerals illustrate:

100. The floating head structure comprises 10, a main body, 11, a first cover plate, 111, a second groove, 12, a second cover plate, 13, a first air flow channel, 20, an elastic sheet, 30, a piston, 31, a first part, 32, a second part, 33, an acting part, 331, an inflatable shaft, 3311, a second air flow channel, 3312, a main channel, 3313, a branch channel, 3314, an inflatable channel, 332, a first moving part, 333, a second moving part, 34, a telescopic part, 341, an inflatable key, 342, a retainer, 343, an annular part, 3431, a first groove, 344, a connecting part, 3441, a first connecting part, 3442, a second connecting part, 35, an inclined surface, 36, a connecting rod, 40, a piston sleeve, 50, a containing cavity, 60, an air flow cavity, 70, a pressing plate and 80 and a guide post.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, an embodiment of the present application provides a floating head structure 100 for holding a workpiece so that the workpiece is in communication with a test socket. Specifically, the part to be tested is a chip, the chip has pins, and when the floating head structure 100 presses the chip, the pins can be conducted with the test seat. Of course, in other embodiments, the type of the to-be-tested device is not limited, as long as the to-be-tested device can be connected to the test socket under the pressing action of the floating head structure 100.

Referring to fig. 1-3, the floating head structure 100 includes a main body 10 and an elastic sheet 20, wherein the elastic sheet 20 is mounted on the main body 10, and a first air flow channel 13 for air flow to the elastic sheet 20 is provided on the main body 10. The floating head structure 100 further includes a piston 30, and the piston 30 is movably mounted to the body 10 in an axial direction (up-down direction in fig. 3) thereof. The elastic piece 20 can apply force to the piston 30 under the action of air flow, and the floating head structure 100 can apply pressure to the to-be-tested piece through the piston 30, so that the to-be-tested piece is communicated with the test seat. Specifically, the air flow introduced into the first air flow channel 13 is compressed air, and the compressed air enters the first air flow channel 13 after being regulated by the proportional valve and the relay.

Further, referring to fig. 3 and 4, the floating head structure 100 further includes at least one piston sleeve 40, and the piston sleeve 40 is disposed outside the piston 30, that is, the piston 30 is mounted in the piston sleeve 40. In some embodiments, the floating head structure 100 includes a piston housing 40, and the piston 30 is adjustable in size in its radial direction to be capable of expanding or separating from the piston housing 40.

In other embodiments, the floating head structure 100 includes at least two piston sleeves 40, each piston sleeve 40 is sleeved outside the piston 30 layer by layer, and the size of the piston 30 in the radial direction is adjustable so as to be capable of expanding or separating from the piston sleeve 40 located at the innermost layer. In each adjacent two layers of the piston sleeves 40, the size of the piston sleeve 40 located at the inner layer in the radial direction of the piston 30 is adjustable, so that the piston sleeve 40 at the inner layer is expanded or separated from the piston sleeve 40 at the outer layer. Wherein when the piston 30 expands with at least one piston sleeve 40, the piston 30 and the expanded piston sleeve 40 together form a combination. When the piston 30 and the piston sleeve 40 are expanded to form a combination, the elastic sheet 20 can apply a force to the combination under the action of air flow, and the combination applies pressure to the to-be-measured piece through the piston 30.

It should be noted that, when the air flows to the elastic sheet 20 through the first air flow channel 13, the elastic sheet 20 can apply a force to the piston 30 or the combination. Regardless of whether the spring plate 20 directly applies a force to the piston 30 or the assembly, the floating head structure 100 applies a force to the part to be tested via the piston 30.

In the above arrangement, when the floating head structure 100 presses the workpiece to be tested by the piston 30, the piston 30 receives the force applied by the elastic sheet 20 under the action of the air flow, and also receives the force applied by the workpiece to be tested. Under the action of the two forces, the elastic sheet 20 is tightly attached to the surface of the piston 30 or the assembly, so that the pins of the to-be-tested piece are finally conducted with the test seat.

It should also be noted that the pressure exerted by the piston 30 on the part to be tested is related to the pressure of the air flow to the first air flow channel 13 and the contact area of the elastic piece 20 with the piston 30 or the combination. When the piston 30 is not expanded with the piston sleeve 40, the pressure applied by the piston 30 to the member to be measured is the product of the contact area of the elastic sheet 20 with the piston 30 and the pressure, which is defined as a first pressure, and when the piston 30 is expanded with the at least one piston sleeve 40, the pressure applied by the piston 30 to the member to be measured is the product of the contact area of the elastic sheet 20 with the combination and the pressure, which is defined as a second pressure. The second pressure is greater than the first pressure and is different depending on the number of piston sleeves 40 that are expanded with the piston 30, and increases gradually as the number of piston sleeves 40 that are expanded with the piston 30 increases.

The floating head structure 100 provided in the embodiment of the present application includes a piston 30 and at least one piston sleeve 40, where when the piston 30 is not expanded with the piston sleeve 40, it can provide a first pressure to the to-be-measured member, and when the piston 30 is expanded with the at least one piston sleeve 40, it can provide a second pressure to the to-be-measured member, where the second pressure is greater than the first pressure. In this way, the piston 30 and the piston sleeve 40 can be controlled to be expanded or separated according to the type or specification of the to-be-measured member, so that the floating head structure 100 can provide the pressure adapted to the to-be-measured member. Compared with a floating head structure 100 capable of providing only one pressure in the prior art, the floating head structure 100 provided by the embodiment of the application can provide different pressures, so that frequent replacement of the floating head structure 100 is avoided, the equipment cost is reduced, and the testing efficiency is improved.

In some embodiments, with continued reference to fig. 3, the main body 10 includes a first cover 11 and a second cover 12, the elastic piece 20 is clamped between the first cover 11 and the second cover 12, the first air flow channel 13 is disposed on the first cover 11, and the accommodating cavity 50 is formed between the elastic piece 20 and the second cover 12. The piston 30 comprises a first portion 31 and a second portion 32 which are axially interconnected, the diameter of the first portion 31 being larger than the diameter of the second portion 32, the first portion 31 and the piston sleeve 40 being both located in the receiving chamber 50, the second portion 32 passing out through the second cover plate 12 at an end axially remote from the first portion 31. Because the diameter of the first portion 31 is larger than that of the second portion 32, when the floating head structure 100 is not required to hold the part to be measured, the first portion 31 is limited in the accommodating cavity 50, the first portion 31 of the piston 30 cannot be separated from the accommodating cavity 50 under the action of gravity, and the piston sleeve 40 cannot be separated from the accommodating cavity 50. When the floating head structure 100 needs to press the to-be-measured member, the piston 30 can be pressed against the to-be-measured member by the second portion 32, and the piston 30 or the assembly is urged to tightly adhere to the elastic sheet 20 under the action of the to-be-measured member. It should be noted that, when the floating head structure 100 presses the part to be tested, the piston 30 or the assembly can move along the axial direction of the piston 30 in the accommodating cavity 50 to approach the elastic piece 20 (float), the elastic piece 20 contacts with the piston 30 or the assembly to apply a force to the elastic piece, and finally the pin of the part to be tested is conducted with the test seat under the pressure of the piston 30.

It is contemplated that in other embodiments, the main body 10 may be configured in other ways, so long as the elastic sheet 20, the piston 30, and the piston sleeve 40 are installed, and the elastic sheet 20 can cause the piston 30 to apply pressure to the workpiece under the action of the air flow.

Further, a second groove 111 is formed on one side of the first cover plate 11 facing the elastic piece 20, and an airflow cavity 60 is formed between the groove wall of the second groove 111 and the elastic piece 20, so that airflow can flow to the airflow cavity 60 through the first airflow channel 13 and act on the elastic piece 20. The airflow chamber 60 can temporarily store more airflow, so that more airflow acts on the elastic sheet 20, and the elastic sheet 20 is fully contacted with the piston 30 or the assembly (in fig. 3, the lower surface of the elastic sheet 20 is fully contacted with the upper surface of the piston 30 or the upper surface of the assembly), so as to finally ensure the pressing effect of the floating head structure 100 on the workpiece to be measured.

It is conceivable that in other embodiments, the second recess 111 may be omitted from the first cover plate 11, which is not limited herein.

In some embodiments, the elastic member is a circular membrane, and an edge of the circular membrane is clamped and fixed between the first cover plate 11 and the second cover plate 12. When the two sides of the diaphragm are acted by different pressures, the diaphragm moves to the side with low pressure in a strain way, so that the center of the diaphragm generates displacement in a certain relation with the pressure difference. Specifically, the membrane is made of rubber materials. It should be understood that in other embodiments, the type and material of the elastic sheet 20 are not limited.

In some embodiments, with continued reference to fig. 3 and 4, the floating head structure 100 further includes a platen 70, the platen 70 being coupled to the piston 30. Specifically, the pressing plate 70 is connected to an end of the second portion 32 of the piston 30 penetrating the second cover plate 12, the piston 30 applies pressure to the workpiece through the pressing plate 70, and the pressing plate 70 is in direct contact with the workpiece.

It is contemplated that in other embodiments, the floating head structure 100 may omit the platen 70, in which case the floating head structure 100 applies pressure directly to the part under test via the piston 30.

In some embodiments, the floating head structure 100 further includes a guide post 80, and the guide post 80 extends along the axial direction of the piston 30 and connects the main body 10 and the platen 70. One of the main body 10 and the pressing plate 70 is movably connected with the guide post 80, and the other is fixedly connected with the guide post 80. The guide posts 80 function to guide the platen 70 as the platen 70 moves relative to the body 10, preventing the platen 70 from deflecting as it moves axially relative to the body 10 along the piston 30.

In one embodiment, the floating head structure 100 includes four guide posts 80, and the four guide posts 80 are connected to the main body 10 and the pressing plate 70, and guide the pressing plate 70 together to facilitate guiding stability. It is contemplated that in other embodiments, the number of guide posts 80 included in the floating head structure 100 is not limited, e.g., the number of guide posts 80 included in the floating head structure 100 may be one, two, three, or more than four.

In some embodiments, the floating head structure 100 includes only one piston sleeve 40. When the piston 30 is separated from the piston sleeve 40, the piston 30 provides a first pressure to the part to be tested, and when the piston 30 and the piston sleeve 40 are expanded to form a combination, the piston 30 provides a second pressure to the part to be tested, and the floating head structure 100 can provide two different forces.

In other embodiments, the floating head structure 100 includes at least two piston sleeves 40. Specifically, the number of piston sleeves 40 is two, and when the piston 30 is not expanded with the innermost piston sleeve 40, the piston 30 provides a first pressure to the part to be tested. When the piston 30 is expanded with the innermost piston sleeve 40 and the inner piston sleeve 40 is separated from the outer piston sleeve 40, the piston 30 provides a second pressure to the part to be tested. When the piston 30 is expanded with the innermost piston sleeve 40 and the inner piston sleeve 40 is expanded with the outer piston sleeve 40, the piston 30 provides another second pressure to the part to be tested. It can be seen that floating head structure 100, when it includes two piston sleeves 40, is capable of providing three different amounts of force. It is contemplated that in other embodiments, the number of piston sleeves 40 included in the floating head structure 100 is not limited, as it is also possible to provide that the floating head structure 100 includes three or more than three piston sleeves 40.

In some embodiments, with continued reference to fig. 3, the piston 30 includes an active portion 33 and a telescoping portion 34 that are connected to each other, the active portion 33 being capable of applying a force to the telescoping portion 34 such that the telescoping portion 34 expands in a radial direction, thereby increasing the size of the piston 30 in the radial direction. Specifically, when the piston 30 and the piston sleeve 40 are required to be expanded to form the assembly, the acting portion 33 applies a force to the expansion portion 34, and the expansion portion 34 extends in the radial direction, so that the size of the piston 30 in the radial direction is increased, and the piston 30 after the size increase can be abutted tightly with the inner wall of the piston sleeve 40 sleeved outside the piston 30 to form the assembly. Here, when it is necessary to separate the piston 30 from the piston sleeve 40, the expansion and contraction portion 34 may be contracted in the radial direction by the action portion 33, or may be contracted when the action portion 33 no longer applies an action thereto.

In some embodiments, referring to fig. 5 and 6, the acting portion 33 includes an inflatable shaft 331, the telescopic portion 34 includes an inflatable key 341 and a retainer 342, the retainer 342 is sleeved outside the inflatable shaft 331, one end of the inflatable key 341 abuts against the inflatable shaft 331, and the other end of the inflatable key 341 is inserted into the retainer 342. The second air flow channel 3311 is disposed in the air expansion shaft 331, and the second air flow channel 3311 supplies air to the air expansion shaft 331, and the air expansion shaft 331 can expand under the action of the air flow to apply a force to the air expansion key 341, and the air expansion key 341 moves outwards relative to the retainer 342, so that the size of the piston 30 in the radial direction is increased and the piston sleeve 40 is expanded to form a combination. Specifically, the flow of air into the second air flow passage 3311 is controlled by a solenoid valve.

In the above arrangement, when the piston 30 needs to be expanded with the piston sleeve 40, air flow is introduced into the second air flow channel 3311 of the air expansion shaft 331, the air expansion shaft 331 expands to enable the air expansion key 341 to move relative to the retainer 342 to expand the piston sleeve 40, when the piston 30 needs to be separated from the piston sleeve 40, air flow is not introduced into the second air flow channel 3311 of the air expansion shaft 331, the air expansion shaft 331 can relax the air expansion key 341, and the air expansion key 341 is not expanded with the piston sleeve 40 any more, so that control is convenient.

Further still, with continued reference to FIG. 4, the second gas flow channel 3311 includes a main channel 3312, a branch channel 3313, and an inflatable channel 3314. The main channel 3312 is axially opened to the air shaft 331, and a plurality of branch channels 3313 are radially provided to the air shaft 331, each of the branch channels 3313 being communicated with the main channel 3312. The balloon channel 3314 is disposed around the main channel 3312 and the branch channel 3313, and the other end of the branch channel 3313 away from the main channel 3312 communicates with the balloon channel 3314. The air flow first enters the main channel 3312 and flows through the main channel 3312 to each branch channel 3313, and finally flows through each branch channel 3313 to the inflatable channel 3314, and the outer periphery of the inflatable shaft 331 is inflated by the air flow and applies a force to the inflatable keys 341.

It is contemplated that in other embodiments, the second airflow channel 3311 may be formed on the air shaft 331 in other manners, and the specific manner in which the second airflow channel is formed is not limited herein, so long as the purpose of expanding the air shaft 331 under the airflow action can be achieved.

Still further, the telescoping portion 34 includes at least two inflatable keys 341, all of which inflatable keys 341 are disposed in a retainer 342 at circumferentially spaced intervals along the piston 30. Thus, when the piston 30 needs to be expanded with the piston sleeve 40, at least two of the expansion keys 341 can be expanded with the piston sleeve 40 under the action of the expansion shaft 331, so that the expansion effect of the piston 30 and the piston sleeve 40 is ensured.

Optionally, at least two inflatable keys 341 are uniformly arranged in the retainer 342 at intervals along the circumferential direction of the piston 30, so that the inflatable keys 341 are uniformly inflated with the piston sleeve 40 in the circumferential direction of the piston 30, and further the inflation effect is ensured. Of course, in other embodiments, at least two of the air-cushion keys 341 may be provided in the retainer 342 at non-uniform intervals along the circumferential direction of the piston 30.

It is contemplated that in other embodiments, the acting portion 33 may comprise a liquid expansion shaft, and the telescoping portion 34 may comprise a liquid expansion key and a retainer 342, with the liquid expansion shaft being capable of expanding through liquid such that the liquid expansion key moves outwardly relative to the retainer 342 to expand against the piston sleeve 40.

In other embodiments, referring to fig. 7, the active portion 33 includes a first moving portion 332, and the telescopic portion 34 includes an annular portion 343. The annular portion 343 is provided with a first groove 3431 at least one end in the axial direction of the piston 30, the first moving portion 332 is fitted into the annular portion 343, and at least one of the first moving portion 332 and the annular portion 343 is provided with an inclined surface 35 inclined with respect to the axial direction. The first moving portion 332 is axially movable within the annular portion 343 to expand or retract the annular portion 343 under the influence of the inclined surface 35.

In the above arrangement, when the piston 30 needs to be expanded with the piston sleeve 40, the first moving portion 332 is controlled to move forward relative to the annular portion 343 in the axial direction, the first groove 3431 is expanded under the action of the inclined surface 35, the annular portion 343 expands to be expanded with the piston sleeve 40, and when the piston 30 needs to be separated from the piston sleeve 40, the first moving portion 332 is controlled to move reversely relative to the annular portion 343 in the axial direction, the annular portion 343 is retracted and the piston sleeve 40 is released, so that the piston 30 is separated from the piston sleeve 40.

Specifically, the floating head structure 100 further includes a first driving member, to which the first moving portion 332 is connected, and which is capable of driving the first moving portion 332 to move in the axial direction within the annular portion 343 so as to expand or retract the annular portion 343.

Further, the first moving portion 332 is a tapered plug, and the inclined surface 35 is provided on the tapered plug. When the first driving member drives the tapered plug to move in the annular portion 343, the annular portion 343 can expand or retract under the action of the inclined surface 35 due to the first groove 3431 formed on the end surface of the annular portion 343, so that the piston 30 and the piston sleeve 40 can be expanded or separated.

Of course, in other embodiments, the shape of the first moving portion 332 is not limited, for example, the first moving portion 332 may be in other irregular shapes, so long as the annular portion 343 can be expanded or retracted.

Alternatively, the annular portion 343 is provided with first grooves 3431 at both ends in the axial direction, and the first grooves 3431 at both ends are sequentially and uniformly staggered. Thus, when the first moving portion 332 moves axially relative to the moving portion, the first grooves 3431, which are uniformly distributed at both ends in sequence in a staggered manner, can be opened or closed, so that the annular portion 343 can be expanded or retracted.

It should be understood that, in other embodiments, the annular portion 343 may be provided with the first groove 3431 only at one end, and the first groove 3431 may be unevenly disposed on the annular portion 343 in the circumferential direction.

In still other embodiments, referring to fig. 8 and 9, the acting portion 33 includes a second moving portion 333, the telescopic portion 34 includes a connecting portion 344, and the second moving portion 333 is hinged to the connecting portion 344. When the second moving portion 333 moves in the axial direction of the piston 30, the connecting portion 344 can be driven to extend or retract in the radial direction (left-right direction in fig. 9).

In the above arrangement, when the piston 30 needs to be expanded with the piston sleeve 40, the second moving portion 333 is controlled to move forward in the axial direction to drive the connecting portion 344 to extend in the radial direction, and when the piston 30 needs to be separated from the piston sleeve 40, the second moving portion 333 is controlled to move backward in the axial direction to drive the connecting portion 344 to retract in the radial direction, and the connecting portion 344 relaxes the piston sleeve 40, so that the piston 30 is separated from the piston sleeve 40.

Specifically, the floating head structure 100 further includes a second driving member, to which the second moving portion 333 is connected, and which is capable of driving the second moving portion 333 to move in an axial direction so as to extend or retract the connection portion 344.

The connection part 344 includes a first connection part 3441 and a second connection part 3442, and the first connection part 3441 and the second connection part 3442 are respectively hinged to the second movement part 333 through the link 36. When the second moving portion 333 moves in the axial direction of the piston 30, the first and second connecting portions 3441 and 3442 can be radially moved closer to or farther from each other to radially extend or retract the connecting portion 344.

It should be noted that, when the floating head structure 100 includes at least two piston sleeves 40, the arrangement of the piston sleeve 40 located at the inner layer may be selected to achieve the expansion or separation of the inner piston sleeve 40 and the outer piston sleeve 40, which will not be described in detail herein.

The application also provides a testing device, which comprises a feeding mechanism, a testing mechanism, a receiving mechanism and a conveying mechanism, wherein the testing mechanism comprises a testing seat and the floating head structure 100. The conveying mechanism is used for conveying the to-be-tested piece provided by the feeding mechanism to the test seat, the floating head structure 100 applies pressure to the to-be-tested piece on the test seat through the piston 30, and the conveying mechanism is used for conveying the to-be-tested piece tested on the test seat to the receiving mechanism for receiving.

The floating head structure 100 and the testing device provided by the embodiment of the application have the following beneficial effects:

By controlling the expansion or separation of the piston 30 and the piston sleeve 40, the purpose of switching the pressure provided to the to-be-tested member is achieved, compared with the floating head structure 100 which only provides one pressure in the prior art, the phenomenon that the type of the to-be-tested member is different and the floating head structure 100 is frequently replaced is avoided, the equipment cost is reduced, and the testing efficiency is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A floating head structure for holding a part to be measured, comprising:

A main body (10);

An elastic sheet (20) mounted on the main body (10), wherein a first air flow channel (13) for air flow to the elastic sheet (20) is arranged on the main body (10);

The floating head structure comprises at least two piston sleeves (40) sleeved outside the piston (30) layer by layer, wherein the size of the piston (30) in the radial direction is adjustable to be capable of expanding or separating from the piston sleeves (40), and the size of the piston (30) in the radial direction is adjustable to be capable of expanding or separating from the piston sleeves (40) in the inner layer when the floating head structure comprises one piston sleeve (40), and the size of the piston (40) in the radial direction is adjustable to be capable of expanding or separating from the piston sleeve (40) in the innermost layer when the piston (30) and the piston sleeve (40) are combined in a tight manner;

The elastic sheet (20) can apply acting force to the piston (30) or the combination under the action of the air flow, and the floating head structure applies pressure to the to-be-detected piece through the piston (30).

2. The floating head structure according to claim 1, wherein the main body (10) includes a first cover plate (11) and a second cover plate (12), the elastic sheet (20) is clamped between the first cover plate (11) and the second cover plate (12), the first air flow channel (13) is arranged on the first cover plate (11), and a containing cavity (50) is formed between the elastic sheet (20) and the second cover plate (12);

the piston (30) comprises a first part (31) and a second part (32) which are mutually connected in the axial direction, the first part (31) and the piston sleeve (40) are both positioned in the accommodating cavity (50), one end, far away from the first part (31) in the axial direction, of the second part (32) penetrates out through the second cover plate (12), and the diameter of the first part (31) is larger than that of the second part (32), so that the first part (31) is limited in the accommodating cavity (50).

3. A floating head structure according to claim 1 or 2, characterized in that the piston (30) or the piston sleeve (40) in the inner layer comprises an active part (33) and a telescopic part (34) connected to each other, the active part (33) being capable of exerting a force on the telescopic part (34) such that the telescopic part (34) extends in the radial direction, whereby the size of the piston (30) or the piston sleeve (40) in the inner layer increases in the radial direction.

4. A floating head structure according to claim 3, wherein the acting part (33) comprises an inflatable shaft (331), the telescopic part (34) comprises an inflatable key (341) and a retainer (342), the retainer (342) is sleeved outside the inflatable shaft (331), one end of the inflatable key (341) is propped against the inflatable shaft (331), and the other end of the inflatable key (341) is penetrated in the retainer (342);

A second airflow channel (3311) is arranged in the air expansion shaft (331), the second airflow channel (3311) supplies airflow to the air expansion shaft (331), the air expansion shaft (331) can expand under the action of the airflow to apply acting force to the air expansion key (341), and the air expansion key (341) moves outwards relative to the retainer (342) so that the size of the piston (30) or the piston sleeve (40) positioned on the inner layer in the radial direction is increased.

5. A floating head structure according to claim 4, characterized in that the telescoping portion (34) comprises at least two of the inflatable keys (341), all of the inflatable keys (341) being penetrated in the retainer (342) at intervals along the circumferential direction of the piston (30).

6. A floating head structure according to claim 3, wherein the acting portion (33) comprises a first moving portion (332), the telescopic portion (34) comprises an annular portion (343), the annular portion (343) is provided with a first groove (3431) at least one end of the piston (30) in the axial direction, the first moving portion (332) is mounted in the annular portion (343), and at least one of the first moving portion (332) and the annular portion (343) is provided with an inclined surface (35) which is inclined relative to the axial direction;

The first moving portion (332) is movable in the axial direction within the annular portion (343) to expand or retract the annular portion (343) under the action of the inclined surface (35).

7. The floating head structure according to claim 6, wherein the annular portion (343) is provided with first grooves (3431) at both ends in the axial direction, and the first grooves (3431) at both ends are sequentially staggered and uniformly distributed.

8. A floating head structure according to claim 3, characterized in that the active portion (33) comprises a second moving portion (333), the telescopic portion (34) comprises a connecting portion (344), the second moving portion (333) being hinged to the connecting portion (344);

When the second moving part (333) moves along the axial direction of the piston (30), the connecting part (344) can be driven to extend or retract in the radial direction.

9. The floating head structure according to claim 8, wherein the connecting portion (344) includes a first connecting portion (3441) and a second connecting portion (3442), the first connecting portion (3441) and the second connecting portion (3442) being hinged to the second moving portion (333) by a link (36), respectively;

When the second moving portion (333) moves in the axial direction of the piston (30), the first connecting portion (3441) and the second connecting portion (3442) can be moved closer to or farther from each other in the radial direction.

10. The testing device is characterized by comprising a feeding mechanism, a testing mechanism, a receiving mechanism and a conveying mechanism, wherein the testing mechanism comprises a testing seat and the floating head structure according to any one of claims 1-9, the conveying mechanism is used for conveying a piece to be tested provided by the feeding mechanism to the testing seat, the floating head structure applies pressure to the piece to be tested on the testing seat through a piston (30), and the conveying mechanism is used for conveying the piece to be tested on the testing seat to the receiving mechanism for receiving.