Safety device for multilayer piezoelectric ceramic thrust test fixture

Abstract

This utility model discloses a safety protection device for a multi-layer piezoelectric ceramic thrust testing fixture, belonging to the field of piezoelectric ceramic testing technology. The device includes a base, a square clamp, a support column, a limiting cylinder, a spring, and a core protective structure. The protective structure includes a flexible protective net surrounding the support column. The upper and lower sides of the protective net are clamped and fixed to the square clamp and the base respectively by separate positioning thin steel sheet assemblies. Its two ends along its length are detachably connected by nylon hook-and-loop fasteners, thus forming a closed protective space. This utility model, by setting a protective net with a high-strength fiber inner layer, can effectively block and capture high-speed flying fragments when the test spring undergoes brittle fracture, completely eliminating safety hazards. Simultaneously, its separate, detachable connection design makes spring replacement very convenient, significantly improving testing safety and maintenance efficiency without affecting the original testing function.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric ceramic performance testing technology, specifically a safety protection device for a multilayer piezoelectric ceramic thrust testing fixture. Background Technology

[0002] Multilayer piezoelectric ceramic devices operate based on the inverse piezoelectric effect, possessing advantages such as high output force, fast response speed, and high displacement resolution, and are widely used in precision drive fields. Their maximum thrust is a key indicator for evaluating their driving performance, typically obtained by measuring the reverse force they withstand when the output displacement is exactly zero at the maximum permissible voltage.

[0003] Currently, this test typically employs a clamping system based on high-stiffness springs. The force-applying device compresses the spring to apply pressure to the piezoelectric ceramic, and a force-measuring unit detects the force value in real time. However, this testing system presents a significant safety hazard: during the test, the spring may experience brittle fracture or fatigue failure due to extreme pressure or cyclic loading. Although the probability of this is low, if it does occur, the spring will instantly shatter into multiple high-speed fragments, posing a serious threat to operators and surrounding precision equipment. Currently, such test clamps generally lack effective protective measures against accidental spring breakage, posing a significant safety risk.

[0004] Therefore, there is an urgent need for a safety protection device that can effectively contain spring fragments, ensure test safety, and not affect normal test operations and the original functions of the fixture. Utility Model Content

[0005] The purpose of this invention is to provide a safety protection device for a multilayer piezoelectric ceramic thrust testing fixture to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A safety protection device for a multilayer piezoelectric ceramic thrust testing fixture includes a base, a square clamp, four pillars, a limiting cylinder, a spring, and a core protective structure. The base has four pillars and one limiting cylinder fixedly mounted via threaded holes at its four corners and center. The spring is sleeved on the limiting cylinder. The square clamp is sleeved on the pillars via flange linear bearings mounted at its four corners and can move axially along the pillars, with its bottom surface pressing against the spring. Preferably, the square clamp has mounting ears at its four corners for mounting the flange linear bearings.

[0008] The safety protection device also includes a flexible protective net that surrounds the entire test area and a positioning thin steel sheet assembly for fixing its upper and lower ends to the square clip and the base, respectively.

[0009] The protective net has a double-layer composite structure. The inner layer is a mesh fabric woven from Kevlar fibers to absorb and capture high-speed debris; the outer layer is abrasion-resistant canvas to protect the inner layer and enhance overall durability. The four sides of the protective net are sealed with an overlapping process to prevent fiber fraying. Preferably, the inner layer is made of two layers of Kevlar 129 fibers woven in a plain weave, with the warp and weft threads of the two layers overlapping at an alternating angle.

[0010] The top and bottom long edges of the protective net are clamped and fixed to the square clip and the base respectively by the positioning thin steel sheet assembly. The two ends of the protective net along its length are detachably connected by nylon hook and loop fasteners, thus forming a closed columnar protective space.

[0011] The positioning thin steel sheet assembly includes a first clamping unit for clamping and fixing the upper part of the protective net and a second clamping unit for clamping and fixing the lower part of the protective net.

[0012] Both the first and second clamping units include a detachable structure consisting of a C-shaped first steel sheet and a straight second steel sheet. The first and second steel sheets can form an O-shaped closed loop structure to securely clamp the edge of the protective mesh to the square clip and the base. This design allows for easy opening of a protective surface after removing the second steel sheet and opening the hook and loop fastener, enabling the square clip to be lifted and the spring replaced, greatly improving maintenance convenience.

[0013] Under normal operating conditions, the protective net flexibly deforms as the square clip moves downwards, without affecting the thrust test. When the spring breaks, the flying debris is effectively blocked and contained by the high-strength, high-toughness Kevlar protective net, thus eliminating safety risks.

[0014] Beneficial effects

[0015] Compared with the prior art, the safety protection device provided by this utility model has the following significant advantages:

[0016] 1. Excellent safety protection performance: By setting up a flexible protective net that completely surrounds the test spring and using high-strength Kevlar fiber fabric as an energy absorption layer, it can effectively block and dissipate the kinetic energy of the fragments and capture them inside the protective net when the spring suffers brittle fracture or fatigue failure. This completely avoids the injury caused to operators and expensive experimental equipment by high-speed fragments flying, and eliminates major safety hazards.

[0017] 2. Convenient and efficient maintenance and replacement: The protective netting achieves detachable connection through nylon hook-and-loop fasteners and a split-design positioning thin steel sheet assembly. When it is necessary to replace the test spring, only a portion of the steel sheet needs to be removed and the hook-and-loop fasteners opened to quickly open one protective surface. The entire device can be disassembled without further disassembly, allowing for convenient spring replacement. This significantly improves testing efficiency and simplifies the maintenance process.

[0018] 3. Does not affect normal testing functions: The protective net of this utility model is made of flexible fabric material. Its top moves synchronously with the square clip and can deform accordingly during the entire thrust test. It does not interfere with the original testing functions such as spring compression, force measurement unit reading and laser displacement sensor monitoring, thus ensuring the accuracy and reliability of the test data.

[0019] 4. Simple, reliable, and adaptable structure: The device has a simple overall structure, mainly using positioning thin steel plates to reliably fix the protective net, making installation convenient. Its flexible design allows it to adapt to testing requirements with different compression strokes, making it highly versatile. The split steel plate design also ensures the stability of the connection and the convenience of disassembly.

[0020] 5. High durability: The protective net adopts a double-layer composite structure, with the inner layer providing primary protection and the outer layer providing wear-resistant protection, which enhances the overall service life and can withstand multiple impacts from potential debris (if multiple tests are required), ensuring high reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 This is a structural schematic diagram from another perspective of an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the protective net connection structure in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the spring connection structure in an embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the first steel sheet and the second steel sheet in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the protective net structure in an embodiment of this utility model;

[0027] Figure 7 The inner layer of the protective net in this embodiment is a mesh fabric woven from Kevlar fibers;

[0028] Figure 8 This is the edge sealing structure of the protective mesh in the embodiment of this utility model.

[0029] Reference numerals: 1. Base; 2. Square clip; 21. Mounting ear; 3. Support column; 4. Limiting cylinder; 5. Spring; 6. Flange linear bearing; 7. Protective net; 71. Inner layer; 711. Kevlar fiber woven mesh fabric; 72. Outer layer; 8. Positioning thin steel sheet assembly; 81. First steel sheet; 82. Second steel sheet; 91. Nylon hook and loop fastener; 92. Nylon hook and loop fastener. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] Example

[0032] like Figure 1-8 As shown in the figure, this embodiment demonstrates a safety protection device for a multilayer piezoelectric ceramic thrust testing fixture. The main structure of the device includes a square base (1) with first threaded holes machined at its four corners and center. The lower parts of the four support pillars (3) and the limiting cylinder (4) are respectively machined with external threads, which are screwed into the corresponding first threaded holes of the base (1) to achieve a fastening connection. The spring (5) to be tested is fitted into the limiting cylinder (4) and placed stably on the base (1).

[0033] The square clamp (2) has mounting ears (21) at its four corners, with second threaded holes and first through holes machined on them. Four flange linear bearings (6) pass through the first through holes and are fixedly mounted on the mounting ears (21) by bolts and second threaded holes. Then, the square clamp (2) is fitted into the four supports (3) through the flange linear bearings (6), so that its bottom surface is pressed smoothly on the spring (5).

[0034] The safety protection device also includes a flexible protective net (7) that surrounds the entire test area and a positioning thin steel sheet assembly (8) for fixing its upper and lower ends to the square clip (2) and the base base (1) respectively.

[0035] The protective net (7) is made of an inner layer (71) and an outer layer (72) sewn together. The inner layer (71) is made of Kevlar 129 fiber double-layer orthogonal plain weave, with the warp and weft threads of the two layers of fabric overlapping at ±45°. The mesh fabric (711) woven from Kevlar fibers is as follows: Figure 7 As shown; the outer layer (72) is made of wear-resistant canvas, such as Figure 8 As shown, the inner layer (71) is completely covered, and the four sides are sealed by overlapping. Figure 6 As shown, one end of the protective net (7) along its length is sewn with a nylon hook and loop fastener (91), and the other end is sewn with a nylon hook and loop fastener (92).

[0036] The positioning thin steel sheet assembly (8) adopts a split design, such as Figure 5 As shown, it includes a separable structure consisting of a first steel sheet (81) with a C-shaped structure and a second steel sheet (82) with a straight structure. The first steel sheet (81) and the second steel sheet (82) can form an O-shaped closed loop structure.

[0037] During installation, first align the nylon hook-and-loop fastener (92) at one end of the unfolded protective net (7) with a post (3). Wrap the protective net (7) around the outside of the four posts (3), placing its upper edge on the base (1). Then cover it with the C-shaped first steel plate (81), clamping the edge of the protective net (7) between the two. Thread the first steel plate (81), the protective net (7), and the base (1) together with bolts and through holes to fix the lower edge of the protective net (7). Similarly, fix the upper edge of the protective net (7) to the square clip (2) using the same components and methods. Finally, attach the nylon hook-and-loop fastener (91) at the other end of the protective net (7) to the nylon hook-and-loop fastener (92), and install the straight second steel plate (82) in place. Tighten with bolts to form a complete closed protective facade.

[0038] During the thrust test, the force-applying device presses down on the square clip (2), which moves down along the support column (3) and compresses the spring (5). The protective net (7) then deforms flexibly without affecting the test. If the spring (5) breaks, the fragments will be effectively captured by the protective net (7). When replacing the spring, simply remove the second steel plate (82), open the nylon hook and loop fastener, and one protective surface can be opened for easy replacement.

[0039] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A safety protection device of a multilayer piezoelectric ceramic thrust test clamp, comprising a base, a square clamping piece arranged above the base, four support columns fixedly arranged at four corners of the base, a limiting cylinder fixedly arranged at a central position of the base, and a spring sleeved on the limiting cylinder, four corners of the square clamping piece being in sliding fit with the support columns through flange linear bearings, characterized in that, Also includes: A flexible protective net is arranged around the outside of the four pillars to form a closed protective space. The upper and lower sides of the protective net are respectively fixedly connected to the square clip and the base. The positioning thin steel sheet assembly is used to clamp and fix the upper and lower sides of the protective net to the square clip and the base respectively; The protective netting is closed at both ends along its length by a detachable connection structure.

2. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 1, wherein: The protective net has a double-layer composite structure. Its inner layer is a mesh fabric layer woven from high-strength fibers, and its outer layer is a wear-resistant fabric layer. The outer layer completely covers the inner layer.

3. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 2, characterized in that: The high-strength fiber is Kevlar 129 fiber, and the inner layer is made of two layers of Kevlar 129 fiber orthogonally plain woven, with the warp and weft threads of the two layers of fabric overlapping at an interlaced angle.

4. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 1, wherein: The detachable connection structure is a nylon hook and loop fastener, with the female hook and loop fastener sewn to one end of the protective net along its length and the male hook and loop fastener sewn to the other end.

5. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 1, wherein: The positioning thin steel sheet assembly includes a first clamping unit for clamping and fixing the upper part of the protective net and a second clamping unit for clamping and fixing the lower part of the protective net; The first clamping unit and the second clamping unit each include a detachable structure consisting of a first steel sheet with a C-shaped structure and a second steel sheet with a straight structure; the first steel sheet and the second steel sheet can form an O-shaped closed loop structure to fix the edge of the protective net to the square clip and the base.

6. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 5, wherein: Corresponding through holes are provided on the edge sealing of the protective net, the first steel sheet, and the second steel sheet. Bolts pass through the through holes on the detachable structure and the edge sealing of the protective net and are threadedly connected to the square clip or the base.

7. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 1, wherein: The height of the limiting cylinder is lower than the height of the spring when it is in a free state.

8. The safety shield of a multilayer piezoelectric ceramic thrust test fixture according to claim 1, wherein: The square clamp has mounting ears at its four corners for mounting the flange linear bearing.

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