LVDT adapter

Abstract

The application provides a LVDT adapter device, which comprises an adapter seat, a LVDT displacement device, a first guide rail, a second guide rail, a first connecting rod, a second connecting rod, an L-shaped piece, a locking device and a center pin; the adapter seat is fixed on the base of a universal testing machine for bending test; the LVDT displacement device is fixed on one side of the adapter seat; the first guide rail and the second guide rail are fixed on the adapter seat in parallel, the first connecting rod is inserted into the first guide rail, and the second connecting rod is inserted into the second guide rail; the L-shaped piece comprises a horizontal rod and a vertical rod; the horizontal rod is connected with the first guide rail and the second guide rail at two ends respectively, and the vertical rod is above the first guide rail; the locking device is connected with the vertical rod and the LVDT displacement device; and the center pin is vertically installed on the middle part of the horizontal rod. The device makes the LVDT and the center pin synchronously displace, and solves the problem of insufficient space of the original clamp using the LVDT device directly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of composite bending test, in particular to a LVDT adapter. BACKGROUND

[0002] The LVDT displacement sensor is a high-precision displacement sensor specially used for micro-displacement precision measurement. The sensor adopts a stainless steel shell, and the coil and circuit are sealed in the stainless steel tube. The sensor has excellent IP protection level and anti-interference performance. The LVDT displacement sensor has high precision, good stability, and theoretically unlimited life, and is widely used in the field of precision measurement and control.

[0003] The existing technology includes a base, a guide rail, a connecting rod, and a top pin, so that the LVDT and the top pin are synchronously displaced. The problem of insufficient space for directly using the LVDT device in the original bending test machine is effectively solved.

[0004] However, the existing technology is achieved by fixing the LVDT device on the base, and all structures must be fixed. If the fixing screw is loose during use, displacement error will occur, which will cause the LVDT and the top pin to be displaced asynchronously. SUMMARY

[0005] To solve the above technical problems, an LVDT adapter is disclosed in the present application. The technical scheme of the present application is as follows:

[0006] An LVDT adapter, comprising an adapter seat, an LVDT displacement device, a first guide rail, a second guide rail, a first connecting rod, a second connecting rod, an L-shaped piece, a locking device, and a top pin.

[0007] The adapter seat is fixed on the base of the universal testing machine for bending test.

[0008] The LVDT displacement device is fixedly installed on one side of the adapter seat. The first guide rail and the second guide rail are fixedly installed on the adapter seat in parallel. The first connecting rod is inserted into the first guide rail, and the second connecting rod is inserted into the second guide rail.

[0009] The L-shaped piece comprises a horizontal rod and a vertical rod.

[0010] The horizontal rod is connected to the first guide rail and the second guide rail at both ends, and the vertical rod is located above the first guide rail.

[0011] The locking device is connected to the vertical rod and the LVDT displacement device.

[0012] The top pin is vertically installed in the middle of the horizontal rod.

[0013] Preferably, a fixing groove is arranged on the vertical rod, and a locking knob is arranged on the locking device and is positionally corresponding to the fixing groove.

[0014] Preferably, the horizontal rod is connected with the first guide rail and the second guide rail through a screw rod at both ends.

[0015] Preferably, a pullable fixing block is arranged on the side of the locking device.

[0016] The fixing block and the locking device form a through hole through which a moving element of the LVDT displacement device passes.

[0017] A fixing knob is arranged on one side of the fixing block.

[0018] Preferably, a plurality of screw holes with the same horizontal height are arranged on the upper end side of the first connecting rod and the second connecting rod.

[0019] Preferably, the ejector pin is threadedly connected with the horizontal rod.

[0020] Preferably, a second fixing block is arranged on one side of the bottom of the adapter seat.

[0021] The second fixing block and the adapter seat form a second through hole through which the bottom of the LVDT displacement device passes.

[0022] A second fixing knob is arranged on one side of the fixing block.

[0023] The technical scheme of the present application can solve the technical problems of the LVDT displacement device in the prior art, such as too small movable range and possible error in parallel movement in the composite material bending test; the technical scheme of the present application connects the LVDT device with the L-shaped piece through the locking device, fixes the parallel first connecting rod and the second connecting rod through the L-shaped piece, can realize synchronous displacement of the two points of the ejector pin and the LVDT device, and maximizes the movable range of the LVDT displacement device in the composite material bending test. The parallel movement has no error and is consistent with the actual position. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only one embodiment of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Wherein the same parts are denoted by the same reference numerals. It is to be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to the directions toward or away from the geometric center of the particular part, respectively.

[0026] Figure 1 First perspective view of the structure of the embodiment;

[0027] Figure 2 Second perspective view of the structure of the embodiment;

[0028] Figure 3 Third perspective view of the structure of the embodiment;

[0029] Figure 4 Fourth perspective view of the structure of the embodiment.

[0030] In the above drawings, each figure number mark represents:

[0031] 1, adapter;

[0032] 1-1, second fixed block

[0033] 1-2, second fixed knob

[0034] 2, LVDT displacement device;

[0035] 3, first guide rail;

[0036] 4, second guide rail;

[0037] 5, first connecting rod;

[0038] 6, second connecting rod;

[0039] 7, L-shaped piece;

[0040] 7-1, horizontal rod;

[0041] 7-2, vertical rod;

[0042] 7-3, fixed groove;

[0043] 8, locking device;

[0044] 8-1, locking knob;

[0045] 8-2, fixed block;

[0046] 8-3, fixed knob;

[0047] 9, thimble;

[0048] 10, base;

[0049] 11, composite material. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the protection scope of the present application.

[0051] EMBODIMENT

[0052] In a specific embodiment, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , an LVDT adapter device includes an adapter seat 1, an LVDT displacement device 2, a first guide rail 3, a second guide rail 4, a first connecting rod 5, a second connecting rod 6, an L-shaped piece 7, a locking device 8, and a center pin 9.

[0053] The adapter seat 1 is fixed to the base 10 of a universal testing machine for bending test.

[0054] The LVDT displacement device 2 is fixedly installed on one side of the adapter seat 1; the first guide rail 3 and the second guide rail 4 are fixedly installed on the adapter seat 1 in parallel; the first connecting rod 5 is inserted into the first guide rail 3; and the second connecting rod 6 is inserted into the second guide rail 4.

[0055] The L-shaped piece 7 includes a horizontal rod 7-1 and a vertical rod 7-2.

[0056] The horizontal rod 7-1 is connected to the first guide rail 3 and the second guide rail 4 at two ends, respectively; and the vertical rod 7-2 is located above the first guide rail 3.

[0057] The locking device 8 is connected to the vertical rod 7-2 and the LVDT displacement device 2.

[0058] The center pin 9 is vertically installed in the middle of the horizontal rod 7-1.

[0059] In the embodiment, first, the adapter seat 1 is fixed to the base 10 of a universal testing machine for bending test by screws or a screw rod; the LVDT displacement device 2 is fixed to the side of the adapter seat 1; the first connecting rod 5 and the second connecting rod 6 fixed by the L-shaped piece 7 are simultaneously inserted into the first guide rail 3 and the second guide rail 4; the locking device 8 is connected to the vertical rod 7-2 of the L-shaped piece 7 and the movable element of the LVDT displacement device 2; at this time, the center pin 9 in the middle of the horizontal rod 7-1 is parallel to the LVDT displacement device 2, and synchronous displacement is realized by the locking device 8.

[0060] When testing, the composite material 11 is placed on the test bed of the universal testing machine, the top pin 9 contacts the composite material 11, the pressure head is pressed to the surface of the composite material 11, and when the pressure is applied, the top pin 9 is displaced, and the LVDT displacement device 2 is synchronously displaced with the top pin 9.

[0061] The embodiment connects the LVDT device and the L-shaped piece 7 through the locking device 8, fixes the parallel first connecting rod 5 and the second connecting rod 6 through the L-shaped piece 7, can realize the synchronous displacement of the top pin 9 and the two points of the LVDT device, maximizes the movable range of the LVDT displacement device 2 in the bending test of the composite material 11, and can be moved in parallel without error and consistent with the actual position.

[0062] The device of the embodiment can be widely used in three-point bending tests and four-point bending tests.

[0063] In a preferred embodiment, the vertical rod 7-2 is provided with a fixing groove 7-3, and the locking device 8 is provided with a locking knob 8-1 corresponding to the position of the fixing groove 7-3.

[0064] The purpose of the fixing groove 7-3 is to provide a limit for the locking knob 8-1.

[0065] When the height of the locking device 8 needs to be adjusted, the locking knob 8-1 is first screwed, so that the height of the locking device 8 can be raised or lowered until the required height is reached, and then the locking knob 8-1 is unscrewed in the opposite direction to complete the fixing.

[0066] In addition, when the locking device 8 needs to be disassembled, the locking knob 8-1 can also be used to complete the disassembly.

[0067] The structure is simple, and the installation and disassembly are convenient.

[0068] In a preferred embodiment, the two ends of the horizontal rod 7-1 are connected to the first guide rail 3 and the second guide rail 4 through a screw rod. The detachable fixing mode makes the installation, disassembly, maintenance or adjustment more convenient.

[0069] In a preferred embodiment, the side of the locking device 8 is provided with a pullable fixing block 8-2.

[0070] The fixing block 8-2 and the locking device 8 form a through hole for the movable element of the LVDT displacement device 2 to pass through.

[0071] One side of the fixing block 8-2 is provided with a fixing knob 8-3.

[0072] When disassembling or installing, only the fixing knob 8-3 needs to be screwed in the opposite direction.

[0073] In a preferred embodiment, the first connecting rod 5 and the second connecting rod 6 are provided with a plurality of screw holes with the same height on the upper side.

[0074] In the present embodiment, the height of the first connecting rod 5 and the second connecting rod 6 needs to be adjusted to adapt to different working conditions, and therefore a plurality of vertical screw holes are designed to facilitate the height adjustment.

[0075] In a preferred embodiment, the top pin 9 is threadedly connected with the horizontal rod 7-1.

[0076] In a preferred embodiment, the adapter 1 is provided with a second fixing block 1-1 on one side of the bottom;

[0077] The second fixing block 1-1 and the adapter 1 form a second through hole for the bottom of the LVDT displacement device 2 to pass through;

[0078] The fixing block 1-1 is provided with a second fixing knob 1-2 on one side.

[0079] During disassembly or assembly, only the second fixing knob 1-2 needs to be screwed in the positive or reverse direction.

[0080] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An LVDT adapter, characterized in that, Includes adapter, LVDT displacement device, first guide rail, second guide rail, first connecting rod, second connecting rod, L-shaped component, locking device and ejector pin; The adapter is fixed to the base of the universal testing machine during the bending test. The LVDT displacement device is fixedly installed on one side of the adapter; the first guide rail and the second guide rail are fixed parallel to each other on the adapter, the first connecting rod is inserted into the first guide rail, and the second connecting rod is inserted into the second guide rail; The L-shaped component includes a horizontal bar and a vertical bar; The horizontal bar is connected to the first guide rail and the second guide rail at its two ends, and the vertical bar is located above the first guide rail; The locking device connects the vertical rod and the movable element of the LVDT displacement device; The ejector pin is vertically mounted in the middle of the crossbar; The ejector pin is parallel to the LVDT displacement device and is synchronously displaced through the locking device.

2. The LVDT adapter according to claim 1, characterized in that, The vertical rod is provided with a fixing groove, and the locking device is provided with a locking knob that corresponds to the position of the fixing groove.

3. The LVDT adapter according to claim 2, characterized in that, The two ends of the crossbar are connected to the first guide rail and the second guide rail via screws.

4. The LVDT adapter according to claim 3, characterized in that, The locking device has a pull-out fixing block on its side; The fixing block and the locking device form a through hole through which the movable element of the LVDT displacement device passes; A fixing knob is provided on one side of the fixing block.

5. An LVDT adapter according to claim 4, characterized in that, The upper side of the first connecting rod and the second connecting rod are provided with multiple screw holes at the same horizontal height.

6. An LVDT adapter according to claim 5, characterized in that, The ejector pin is threadedly connected to the crossbar.

7. An LVDT adapter according to claim 6, characterized in that, A second fixing block is provided on one side of the bottom of the adapter; The second fixing block and the adapter form a second through hole through which the bottom of the LVDT displacement device passes; A second fixing knob is provided on one side of the fixing block.

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