A foam steady-state compression strength testing machine

Abstract

The utility model belongs to the field of foam production auxiliary equipment, and specifically relates to a foam steady-state compression strength testing machine, comprising a top plate, a first movable plate, a second movable plate and a bottom plate which are sequentially arranged up and down, and also comprising four guide pillars, a downward pressure driving mechanism and a load pressure sensor, wherein both ends of each guide pillar are respectively fixed to the top plate and the bottom plate, and the four guide pillars are respectively arranged on the four corners of the top plate, the first movable plate and the second movable plate are both sleeved on the guide pillars and can slide on the guide pillars, the downward pressure driving mechanism is fixed on the top plate, the actuator of the downward pressure driving mechanism can be raised and lowered, and can push the first movable plate downward, the load pressure sensor is fixed on the upper surface of the bottom plate, and the induction part of the load pressure sensor faces the second movable plate. The utility model can conveniently test the steady-state compression strength of the foam, and provides assistance for ensuring product quality.

Description

Technical Field

[0001] The utility model belongs to the field of foam production auxiliary equipment, and in particular relates to a foam steady-state compression strength testing machine. Background Art

[0002] Foam is a material made of foamed plastic particles, referred to as foam. There are a lot of bubbles inside the material, so it has a series of advantages such as high elasticity, light weight, fast pressure-sensitive fixation, easy use, easy bending, ultra-thin volume, and reliable performance. Therefore, it is often used in the fields of buffering, vibration isolation, sound insulation, moisture resistance, and shock resistance.

[0003] The compression performance of foam plays a vital role in the field of cushioning protection. Currently, there are two types of compression requirements for foam: transient compression strength and steady-state compression strength. Transient compression strength can be tested by a tensile machine, while steady-state compression strength requires a deformation to be maintained for several hours to test its reaction force. Currently, there is no better equipment for testing. Summary of the invention

[0004] Therefore, the technical problem to be solved by the utility model is that the existing rotor housing is clamped on the inner expansion chuck during processing, but the stability is poor, which will affect the processing accuracy and cause more defective products.

[0005] In order to solve the above technical problems, the utility model provides a foam steady-state compression strength testing machine, comprising a top plate, a first movable plate, a second movable plate and a bottom plate arranged in sequence from top to bottom, and also comprising four guide pillars, a downward pressure driving mechanism and a load pressure sensor, the two ends of each guide pillar are respectively fixed to the top plate and the bottom plate, the four guide pillars are respectively arranged on the four corners of the top plate, the first movable plate and the second movable plate are both inserted into the guide pillars and can slide on the guide pillars, the downward pressure driving mechanism is fixed to the top plate, the actuator of the downward pressure driving mechanism can be raised and lowered, and can push the first movable plate downward, the load pressure sensor is fixed to the upper surface of the bottom plate, and the sensing part of the load pressure sensor faces the second movable plate.

[0006] Preferably, the downward pressure driving mechanism is a screw-ball pair, including a screw and a ball nut, the top plate is provided with a through hole, the ball nut is provided with a flange, the ball nut is inserted into the through hole, the flange of the ball nut is located on the upper surface of the top plate and is fixed to the top plate, the screw is inserted into the ball nut, and the screw is the actuator of the downward pressure driving mechanism.

[0007] Preferably, a circular pressing block is fixed to the bottom of the screw rod, and the bottom surface of the circular pressing block is detachably connected to a detachable rubber protective plate.

[0008] Preferably, the four corners of the first movable plate and the second movable plate are provided with through holes, a guide sleeve is inserted into each of the through holes, the guide sleeve is provided with a flange, the flange of the guide sleeve is located on the upper surface of the movable plate, the flange of the guide sleeve is fixed to the movable plate, and the guide column is inserted into the guide sleeve.

[0009] Preferably, it further comprises a displacement meter, wherein the displacement meter is located between the first movable plate and the second movable plate, the displacement meter is fixed on the upper surface of the second movable plate, and the sensing part of the displacement meter faces the first movable plate.

[0010] Preferably, a rotating hand wheel is fixed on the top of the screw rod.

[0011] The technical solution of the utility model has the following beneficial effects:

[0012] The utility model mainly includes a downward pressure driving mechanism, a first movable plate, a second movable plate and a load pressure sensor. The load pressure sensor is fixed under the second movable plate. Through multiple tests, the compressive stress on the foam sample is gradually increased each time to increase the compression amount of the foam sample, so as to test the maximum compressive stress of the foam sample when it is destroyed. The compressive stress at this time is the compressive strength of the sample. Each time during the test, the foam sample needs to be placed between the first movable plate and the second movable plate, and the downward pressure driving mechanism is operated to gradually press down the first movable plate, the foam sample, and the second movable plate. In this process, the foam sample is squeezed and deformed, thereby acting on the second movable plate, and the second movable plate reacts to the load pressure sensor, so that the load pressure sensor tests the stress of the foam sample.

[0013] When testing steady-state compressive strength, the compressive stress of the tested object when it is compressed decays over time. Therefore, each time the test is performed, the object can be stably compressed for several hours by maintaining the position of the actuator of the downward driving mechanism. The final stable compressive stress value is the compressive stress during the test.

[0014] The utility model can conveniently test the steady-state compression strength of the foam, thus providing assistance in ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a three-dimensional diagram of the appearance of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model.

[0018] Explanation of the reference numerals: 1. top plate; 2. first movable plate; 3. second movable plate; 4. bottom plate; 5. guide column; 6. downward pressure driving mechanism; 61. screw rod; 62. ball nut; 7. load pressure sensor; 8. round pressure block; 9. rubber protection plate; 10. guide sleeve; 11. displacement meter; 12. rotating hand wheel. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] The utility model provides a foam steady-state compression strength testing machine, comprising a top plate 1, a first movable plate 2, a second movable plate 3 and a bottom plate 4 which are sequentially arranged in the upper and lower parts, and also comprising four guide pillars 5, a downward pressing driving mechanism 6 and a load pressure sensor 7. Both ends of each guide pillar 5 are respectively fixed to the top plate 1 and the bottom plate 4, the four guide pillars 5 are respectively arranged on the four corners of the top plate 1, the first movable plate 2 and the second movable plate 3 are both sleeved on the guide pillars 5 and can slide on the guide pillars 5, the downward pressing driving mechanism 6 is fixed on the top plate 1, the actuator of the downward pressing driving mechanism 6 can be raised and lowered, and can push the first movable plate 2 downward, the load pressure sensor 7 is fixed on the upper surface of the bottom plate 4, and the induction part of the load pressure sensor 7 faces the second movable plate 3.

[0024] The use principle of the utility model is as follows: when the foam needs to be tested, the foam is placed between the first movable plate 2 and the second movable plate 3. Since the first movable plate 2 can slide on the guide column 5, it is convenient to put foams of different thickness specifications between the two. When the foam is placed on the second movable plate 3, the first movable plate 2 slides to the corresponding height position according to the thickness of the foam; then the worker operates the downward pressing driving mechanism 6 to start, so that the actuator of the downward pressing driving mechanism 6 descends. When the bottom of the actuator touches the first movable plate 2, it will press the first movable plate 2 downward. After the first movable plate 2 is pressed downward, it is pressed toward the foam, and after the foam is pressed downward, it is pressed toward the second movable plate 3. After the second movable plate 3 is pressed downward, it is pressed toward the load pressure sensor 7. The layers are pressed tightly, and the foam is squeezed and deformed in this process. In this process, this layer-by-layer pressing state needs to be maintained for several hours. At the same time, the foam sample generates a reaction force on the load pressure sensor 7, especially a reaction force on the sensing part of the load pressure sensor 7, so that the load pressure sensor 7 tests the compression stress at this time. The same test as above is performed multiple times, but the pressure value on the foam sample is gradually increased, so that the compressive stress of the foam sample is gradually increased. The test is stopped until the foam sample is destroyed. The compressive stress when the foam sample is destroyed is the compressive strength of the foam.

[0025] It is worth noting that when testing steady-state compressive strength, the compressive stress of the tested object when it is compressed decays over time. Therefore, each time the test is performed, the object needs to be stably compressed for several hours, and the final stable compressive stress value is the compressive stress during the test.

[0026] After each test is completed, the actuator of the pressing driving mechanism 6 can be operated to rise, so that the first movable plate 2 releases the pressing of the foam sample, which makes it convenient to replace / remove the foam sample.

[0027] The downward pressure driving mechanism 6 in the utility model is a screw rod 61 ball pair, including a screw rod 61 and a ball nut 62. The top plate 1 is provided with a through hole, and the ball nut 62 is provided with a flange. The ball nut 62 penetrates into the through hole. The flange is located on the upper surface of the top plate 1 and is fixed to the top plate 1. The screw rod 61 penetrates into the ball nut 62. The screw rod 61 is the actuator of the downward pressure driving mechanism 6. Due to the mutual cooperation between the screw rod 61 and the ball nut 62, the worker manually rotates the screw rod 61 to make the screw rod 61 rise and fall.

[0028] In order to increase the pressing area of ​​the screw rod 61 and balance the pressure of the pressing driving mechanism 6 on the foam sample as much as possible, a circular pressing block 8 is fixed at the bottom of the screw rod 61. In order to prevent the circular pressing block 8 from rubbing against the first movable plate 2 when the screw rod 61 descends and rotates, causing an imbalance in the pressing force and affecting the test results, a detachable rubber protective plate 9 is detachably connected to the bottom of the circular pressing block 8. If the rubber on the rubber protective plate 9 is severely worn, the rubber protective plate 9 can be replaced.

[0029] The four corners of the first movable plate 2 and the second movable plate 3 are provided with perforations, and a guide sleeve 10 is inserted into each perforation. The guide sleeve 10 is provided with a flange, and the flange of the guide sleeve 10 is located on the upper surface of the movable plate. The flange of the guide sleeve 10 is fixed to the movable plate, and the guide post 5 is inserted into the guide sleeve 10. The mutual cooperation between the guide sleeve 10 and the guide post 5 can prevent the perforations of the movable plate from rubbing against the guide post 5 for a long time, thereby preventing the perforations and the guide post 5 from being worn, and affecting the stable lifting and lowering of the movable plate. In addition, the guide sleeve 10 can improve the smoothness of the sliding of the movable plate.

[0030] The utility model further includes a displacement meter 11. The displacement meter 11 in the utility model is a probe-shaped displacement meter. The displacement meter 11 is located between the first movable plate 2 and the second movable plate 3. The displacement meter 11 is fixed on the upper surface of the second movable plate 3. The sensing part of the displacement meter 11 faces the first movable plate 2. The displacement meter 11 is put into use during each test. When the first movable plate 2 is pressed down, the displacement meter 11 measures the distance the first movable plate 2 descends and converts the amount of foam compression. During each measurement, by observing the data of the displacement meter 11, the descending amount of the first movable plate 2 can be controlled, thereby controlling the steady-state compression stress of the foam.

[0031] In order to facilitate the rotation of the screw rod 61 , a rotating hand wheel 12 is fixed on the top of the screw rod 61 .

[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A foam steady-state compression strength testing machine, characterized in that: The invention comprises a top plate (1), a first movable plate (2), a second movable plate (3), and a bottom plate (4) which are arranged in sequence from top to bottom, and also comprises four guide pillars (5), a downward pressure driving mechanism (6), and a load pressure sensor (7). The two ends of each guide pillar (5) are respectively fixed to the top plate (1) and the bottom plate (4). The four guide pillars (5) are respectively arranged at the four corners of the top plate (1). The first movable plate (2) and the second movable plate (3) are both sleeved on the guide pillars (5) and can slide on the guide pillars (5). The downward pressure driving mechanism (6) is fixed on the top plate (1). The actuator of the downward pressure driving mechanism (6) can be raised and lowered and can push the first movable plate (2) downward. The load pressure sensor (7) is fixed on the upper surface of the bottom plate (4), and the sensing part of the load pressure sensor (7) faces the second movable plate (3).

2. A foam steady-state compression strength testing machine according to claim 1, characterized in that: The downward pressure driving mechanism (6) is a screw rod (61) ball pair, comprising a screw rod (61) and a ball nut (62); the top plate (1) is provided with a through hole; the ball nut (62) is provided with a flange; the ball nut (62) is inserted into the through hole; the flange of the ball nut (62) is located on the upper surface of the top plate (1) and is fixed to the top plate (1); the screw rod (61) is inserted into the ball nut (62); the screw rod (61) is the actuator of the downward pressure driving mechanism (6).

3. A foam steady-state compression strength testing machine according to claim 2, characterized in that: A circular pressing block (8) is fixed to the bottom of the screw rod (61), and a detachable rubber protective plate (9) is detachably connected to the bottom surface of the circular pressing block (8).

4. A foam steady-state compression strength testing machine according to claim 1, characterized in that: The four corners of the first movable plate (2) and the second movable plate (3) are each provided with a through hole, a guide sleeve (10) is inserted into each of the through holes, the guide sleeve (10) is provided with a flange, the flange of the guide sleeve (10) is located on the upper surface of the movable plate, the flange of the guide sleeve (10) is fixed to the movable plate, and the guide column (5) is inserted into the guide sleeve (10).

5. A foam steady-state compression strength testing machine according to claim 1, characterized in that: It also comprises a displacement meter (11), the displacement meter (11) being located between the first movable plate (2) and the second movable plate (3), the displacement meter (11) being fixed to the upper surface of the second movable plate (3), and the sensing part of the displacement meter (11) facing the first movable plate (2).

6. A foam steady-state compression strength testing machine according to claim 2, characterized in that: A rotating hand wheel (12) is fixed on the top of the screw rod (61).

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