Simple sample preparation machine for thick-wall PVC pipe sample

Abstract

The utility model relates to the technical field of sample preparation equipment, in particular to a simple sample preparation machine for a thick-wall PVC pipe sample. Comprising an upper die device and a lower positioning device, the lower positioning device comprises a bottom plate, a movable plate, a base plate and a jack, and the upper die device comprises an upper fixing plate, a connecting plate and a material pressing die; the jack is fixedly connected with the bottom plate, the movable plate can move up and down under the action of the jack, the upper fixed plate is elastically connected with the movable plate, and the base plate is fixedly connected with the movable plate; the pressing die for sample preparation is arranged below the connecting plate; the upper mold device is further provided with a sample plate demolding pin and a reset spring which are used for enabling the upper mold device to reset automatically after sample preparation. According to the thick-wall PVC pipe tensile sample manufacturing machine tool, large-diameter thick-wall pipe samples can be manufactured according to the shapes of the test pieces, the sizes of the manufactured samples meet the standard requirement and have accuracy, the sample manufacturing machine is simple in structure, small in size and convenient to operate, and the tensile detection requirement of the samples is met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of sample preparation equipment, in particular to a simple sample preparation machine for thick-walled PVC pipe samples. BACKGROUND

[0002] PVC material is an important material in modern chemical production, and it is widely used in life and industry. After PVC material, that is, polyvinyl chloride resin, is matched with stabilizers, lubricants and the like and then extruded into a tubular shape by a hot pressing method, PVC pipes are obtained. By adopting different process proportions, PVC pipes are generally divided into PVC-U pipes, PVC-M pipes and PVC-O pipes. Among them, PVC-U pipes have strong corrosion resistance, are easy to bond, have low prices and hard texture. They are used for applications such as drainage, wastewater, chemicals, heating and cooling liquids, food, ultra-pure liquids, mud, gas, compressed air and vacuum systems. PVC-O pipes, the Chinese name of which is biaxially oriented polyvinyl chloride, are the latest evolution form of PVC pipes. The pipes are manufactured by a special orientation processing technology. The PVC-U pipes produced by the extrusion method are axially stretched and radially stretched, so that the long-chain molecules of PVC in the pipes are regularly arranged in the biaxial direction, and a new type of PVC pipe material with high strength, high toughness, high impact resistance and fatigue resistance is obtained. During the production of polyvinyl chloride material, various kinds of additives such as stabilizers and plasticizers are added. This results in a great difference in the performance of PVC materials. The tensile property of PVC material is an important standard for evaluating its use performance, and the national standard for testing the tensile property of plastics (GB / T 1040.1-2018) is established to detect the quality and specifications. The standard stipulates that the number of samples in each test direction is not less than 5. In the standard (GB / T 1040.2-2022) for testing the tensile property of plastics, part 2: test conditions for molded and extruded plastics, there are new provisions. According to different test sample conditions, the samples are required to be made into 1A and 1B shapes.

[0003] In the related art, for small-diameter PVC pipes, since the wall thickness is thin, the processing difficulty of the samples is not very high, and the sample production task can be completed by using a mold. However, for large-diameter PVC pipes or similar plastic pipes, there is no special sample production equipment for the processing of thick-walled pipe samples, and the test conditions for detection have strict requirements. With the rapid development of the national thermal power, chemical industry and other industries, the demand for PVC pipes has also increased sharply, and some large-diameter thick-walled PVC pipes have gradually increased. These PVC pipes need to be detected. These PVC pipes have the characteristics of thick wall, high sample processing difficulty and high detection requirement. Therefore, in the related art, there is no special sample production equipment for the processing of thick-walled pipe samples of large-diameter PVC pipes or similar plastic pipes, but the demand for them is increasing and the detection requirements are high, which has great defects. CONTENT OF THE INVENTION

[0004] The utility model solves the technical problem of providing a thick wall PVC pipe sample simple sample sample machine, utilize this equipment can make the sample satisfying standard requirement, the sample sample machine simple structure, small, convenient operation, accelerate sample production efficiency, improve the detection condition, complete PVC pipe detection task.

[0005] A kind of thick wall PVC pipe sample simple sample sample machine, including upper die device and lower positioning device, lower positioning device includes bottom plate, movable plate, backing plate and jack, upper die device includes upper fixed plate, connecting plate, pressing die;Jack is fixedly connected with bottom plate, movable plate can move up and down under the action of jack, upper fixed plate is elastically connected between movable plate, backing plate is fixedly connected with movable plate;The pressing die for sample preparation is arranged below connecting plate;Upper die device is further provided with sample plate demolding pin and return spring, for making upper die device automatically reset after sample preparation.

[0006] Further, the sample preparation machine is provided with a plurality of stand columns connecting the bottom plate, the movable plate and the upper fixed plate.

[0007] Further, a stand column spring is arranged on the connecting stand column between the upper fixed plate and the movable plate.

[0008] Further, the jack is fixedly connected with the bottom plate;The backing plate is set as a non-metal backing plate.

[0009] Further, the upper fixed plate is tightly connected with the connecting plate by connecting bolts;A sample plate demolding pin is arranged between the connecting plate and the upper fixed plate, and a return spring is arranged on the sample plate demolding pin.

[0010] Further, the jack is provided with a handle to lift or lower the movable plate.

[0011] Further, a plurality of cutting grooves are arranged on the backing plate, and the pressing die is provided with a plurality of die tubes and a pressing assembly;The bottom of the die tube is matched with a corresponding cutting groove.

[0012] Further, the pressing assembly includes a plurality of pressing pistons, one end of the pressing piston is arranged on the connecting plate, and the other end is inserted into the die tube and can move up and down.

[0013] Further, a limiting groove is arranged on the side wall of the stand column, and a limiting assembly is detachably connected.

[0014] Further, a retractable cutting structure or clamping structure is arranged on the limiting assembly.

[0015] The present application includes at least one of the following beneficial technical effects:

[0016] 1. The present application uses a pressing die, through the up and down movement of the jack, the thick-walled PVC sample is extruded and cut in the pressing die, providing a device for producing profile samples; the sample preparation machine can replace the pressing die, prepare different types and models of samples, and then make samples of different sizes, and then perform tensile test detection. The present application moves up and down with the jack screw as the center, after making the sample, unloading the jack, the stand spring is arranged on the stand column of the movable plate, and the movable plate is pushed to the initial working state. The sample in the pressing die is pushed out by the reset spring, and through the above repeated operation, multiple samples can be prepared, and the sample consistency is related to the pressing die.

[0017] 2. The embodiment of the present application can realize the processing of multiple samples in the same mold, and multiple samples can be produced through all the processes each time, saving the ingredients and not wasting the raw materials. One PVC sample can produce multiple samples, save process, save time, and improve the efficiency of sample production.

[0018] 3. In the embodiment of the present application, the structure of the backing plate and the pressing die core can be changed, so that one pressing die is equipped with multiple different cutting grooves at the same time, different cutting grooves can cut out samples of different specifications, and the structure of the sample output can be adjusted according to the pipe type and experimental requirements.

[0019] 4. The embodiment of the present application does not need to transfer the thick-walled PVC sample to different molds, avoids the error caused by moving the ingredients, and can directly perform secondary processing.

[0020] 5. In the embodiment of the present application, different sizes of clamping jaws can be replaced for clamping and fixing the thick-walled PVC sample on the side, increasing the stability and strengthening the sample preparation effect.

[0021] 6. The embodiment of the present application increases the cutting structure on both sides of the sample preparation machine, which can not only process samples with consistent thickness, but also process non-standard samples, such as edge chamfering, beveling, etc., which need to be processed twice. The secondary processing structure such as cutting structure can be set in the sample machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a PVC pipe 1A and 1B sample schematic diagram in the related art;

[0023] Figure 2 is a thick-walled PVC pipe sample preparation machine structure schematic diagram of the embodiment of the present application;

[0024] Figure 3 is a thick-walled PVC pipe sample preparation machine jack lifting state diagram of the embodiment of the present application;

[0025] Figure 4is a structural schematic diagram of a thick-walled PVC pipe sample sample preparation machine of embodiment two of the application;

[0026] Figure 5 is a state diagram of the thick-walled PVC pipe sample sample preparation machine of embodiment two of the application after the jack is raised;

[0027] Figure 6 is a structural schematic diagram of a clamping claw of a thick-walled PVC pipe sample sample preparation machine of embodiment three of the application;

[0028] Figure 7 is a structural schematic diagram of a cutting structure of a thick-walled PVC pipe sample sample preparation machine of embodiment three of the application;

[0029] Figure 8 is a bottom view structural schematic diagram of an upper mold core of a thick-walled PVC pipe sample sample preparation machine of embodiment one of the application.

[0030] Legend: 1, base plate; 2, movable plate; 3, connecting plate; 4, upper fixed plate; 5, pad plate; 6, stand column; 7, pressing die; 8, jack; 9, sample plate demolding pin; 10, reset spring; 11, stand column spring; 12, connecting bolt; 14, PVC sample; 21, cutting groove; 22, mold pipe; 23, piston column; 24, waste; 31, limiting groove; 32, limiting assembly; 33, limiting column; 34, first limiting hole; 35, limiting nail; 36, cutting and polishing knife; 37, clamping claw; 38, hidden groove; 41, upper mold core. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying Figures 1-8 The application will be further described in detail.

[0032] Reference Figure 1 In the relevant technical standard of the test conditions of molded and extruded plastics (GB / T 1040.2-2022) Determination of tensile properties of plastics Part 2: Test conditions for molding and extrusion plastics, the PVC pipe 1A and 1B sample schematic diagram.

[0033] Embodiment one:

[0034] Reference Figure 2 and Figure 3 A simple sample sample preparation machine for thick-walled PVC pipe samples, comprising an upper mold device and a lower positioning device, the lower positioning device comprising a base plate 1, a movable plate 2, a pad plate 5 and a jack 8, the upper mold device comprising an upper fixed plate 4, a connecting plate 3 and a pressing die 7.

[0035] The jack 8 is fixedly connected with the bottom plate 1, the bottom plate 1 is made of thick cast steel and has strong stability, the jack 8 is placed in the middle of the bottom plate 1, and the jack 8 is fixedly connected with the bottom plate 1 through threaded fasteners. The sample preparation machine is provided with a plurality of stand columns 6 connected with the bottom plate 1, the movable plate 2 and the upper fixed plate 4. In the embodiment of the application, the upper fixed plate 4, the movable plate 2 and the bottom plate 1 are connected through four stand columns 6, in order to increase the reset capacity, a stand column spring 11 is arranged between the movable plate 2 and the upper fixed plate 4 of a single stand column 6, and the upper fixed plate 4 and the movable plate 2 are elastically connected. The upper fixed plate 4 and the connecting plate 3 are tightly connected through connecting bolts 12. The gusset plate 5 is connected with the movable plate 2 through threaded fasteners.

[0036] Under the action of the jack 8, the movable plate 2 can move up and down, the gusset plate 5 is fixedly connected with the movable plate 2, and there is sufficient operation space between the gusset plate 5 and the mold. The gusset plate 5 is made of non-metallic material and has sufficient hardness and toughness, but the non-metallic material has lower strength than metal, so that the cutting edge of the mold can be protected. Alternatively, a thin rubber skin is placed on the gusset plate 5 to protect the cutting edge of the mold.

[0037] The material pressing mold 7 is connected with the connecting plate 3 through a certain structure, for example, is fixedly connected through mechanical fixing such as bolt / screw fixing, the bottom of the material pressing mold 7 is designed to be provided with threaded holes or through holes, and the material pressing mold 7 is fixed on the connecting plate 3 of the sample preparation machine through bolts. A positioning pin can be further arranged to assist alignment, so as to ensure the clamping precision in repeated clamping. For example, a standardized interface is adopted, and the material pressing mold 7 and the connecting plate 3 adopt a standardized interface (such as an HSK, CAT tool holder or a customized quick-change module). The switching is completed through a mechanical hand or an automatic locking mechanism. The standardized interface connection structure has the advantages of strong compatibility and suitability for multi-variety production when the mold is replaced. The material pressing mold 7 for sample preparation is arranged below the connecting plate 3. The material pressing mold 7 can be replaced to prepare samples of other approximate sizes.

[0038] The upper mold device is further provided with a sample plate demolding pin 9, the sample plate demolding pin 9 is provided with a reset spring 10 and is used for automatically resetting the upper mold device after sample preparation. The upper fixed plate 4 and the connecting plate 3 are connected through four threaded fasteners, and the connecting plate 3 and the upper fixed plate 4 are provided with a special sample plate demolding pin 9, and the sample plate demolding pin 9 is provided with a specially designed reset spring 10.

[0039] The jack 8 is provided with a handle, so that the movable plate 2 can be lifted or lowered. The thick-walled PVC pipe sample simple sample preparation machine can complete the preparation of a PVC pipe sample, the jack 8 at the bottom of the sample preparation machine can press the thick-walled PVC sample 14 by the material pressing mold 7, after being pressed to a certain degree, the sample is prepared. After the jack 8 is unloaded, the waste 24 of the thick-walled PVC pipe falls, the sample is in the material pressing mold 7, the sample is pushed out by the reset spring 10 in the resetting process, and the sample can reliably be demolded, or the demolding pin shaft of the sample plate demolding pin 9 is hammered, and the sample is separated from the material pressing mold 7.

[0040] The working principle of the embodiment of the application is as follows:

[0041] The thick-walled PVC sample 14 is placed on the base plate 5 in an arc shape similar to a flat plate for sample preparation. After the thick-walled PVC sample 14 is placed, the handle of the jack 8 is actuated to lift the movable plate 2. Under the action of the jack 8, the PVC pipe is extruded into the pressing die 7. In the continuous extrusion process, the PVC pipe is extruded by the pressing die 7. When the lower edge of the pressing die 7 is attached to the base plate 5, the lifting is stopped, and the jack 8 is kept in a stable state. At this time, the sample is completely cut down by the pressing die 7. After that, the jack 8 is unloaded. During the unloading process, the column spring 11 on the column 6 returns to its original state, so that the movable plate 2 moves downward to the initial state. Under the action of the sample demolding pin 9 and the reset spring 10, the sample in the mold is separated and falls off, and the PVC sample preparation is completed. Refer to Figure 8 , Figure 8 To cooperate with the upper mold core 41 of the sample 1A and 1B in Figure 1

[0042] The embodiment of the application moves up and down with the jack 8 screw rod as the center. After the sample is prepared, the jack 8 is unloaded, and the column spring 11 on the column 6 of the movable plate 2 pushes the movable plate 2 to the initial working state. The sample in the pressing die 7 is pushed out by the reset spring 10. Through the above repeated operation, multiple samples can be prepared, and the sample consistency is related to the mold.

[0043] Embodiment two:

[0044] Refer to Figure 4 and Figure 5 ​The difference between the embodiment and the embodiment one is that the gasket plate 5 is provided with a plurality of cutting grooves 21, the shape of the cutting groove is not limited, and a plurality of die pipes 22 are arranged in the cutting groove 21, the outer wall of the die pipe 22 is matched with the inner wall of the cutting groove 21, so that the bottom end of the die pipe 22 is arranged in the cutting groove 21; the bottom of the die pipe 22 is matched with the corresponding cutting groove 21. The pressing assembly includes a plurality of piston columns 23, one end of the piston column 23 is arranged in the connecting plate 3, and one end is inserted into the die pipe 22 and can move up and down. The top of the piston column 23 is fixedly connected with the connecting plate 3, the outer wall of the piston column 23 is matched with the inner wall of the die pipe 22, so that the lower part of the piston column 23 can be inserted into the upper part of the die pipe 22, the piston column 23 can move up and down in the die pipe 22, and the piston column 23 is matched with the jack 8 and the gasket plate 5 to realize pressing and cutting. The die pipe 22, the cutting groove 21 and the piston column 23 are one-to-one corresponding. Different types of mold cores are arranged at the bottom of the piston column 23. In the embodiment one, only the lower positioning device applies pressure, and the piston column 23 in the upper die device of the embodiment also plays a role of pressing. The embodiment can also process a plurality of samples from the PVC sample 14 at the same time.

[0045] The surface of the formed sample is flat, smooth, crack-free, tear-free, and defect-free. In the embodiment, the unloading jack 8 falls the waste 24 of the thick-walled PVC pipe, and the sample is also in the pressing die 7. The reset spring 10 pushes the sample out during the reset process, and the sample can reliably be ejected from the mold, or the sample is separated from the pressing die 7 by hammering the demolding pin shaft. The processing of a plurality of samples in the embodiment can be realized in the same mold, a plurality of samples are produced by going through all the processes each time, raw materials are saved, and waste is saved. One PVC sample 14 can produce a plurality of samples, save processes, save time, and improve the efficiency of producing samples.

[0046] In the embodiment, the shapes of the gasket plate 5, the cutting groove 21 and the mold core structure of the pressing die 7 can be changed, so that one pressing die 7 is equipped with a plurality of different cutting grooves 21 at the same time, different specifications of samples can be cut through different cutting grooves 21, and the structure of the sample output is adjusted according to the pipe type and experimental requirements.

[0047] Embodiment three:

[0048] Referring to Figure 6 and Figure 7 The difference between the embodiment and the embodiment one is:

[0049] The side wall of the column 6 is provided with a plurality of limiting grooves 31, and a limiting assembly 32 is detachably connected. The embodiment of the present application does not need to transfer the thick-walled PVC sample 14 to different molds, avoids the error caused by moving the ingredients, and can directly perform secondary processing. In the embodiment of the present application, the limiting assembly 32 is provided with a limiting column 33 with a limiting protrusion at one end, the limiting protrusion can be inserted into the limiting groove 31, and the limiting groove 31 can clamp the limiting column 33. After insertion, a second limiting groove 31 and a second limiting column 33 can be further arranged in another dimension of the column 6, further reinforcing the limiting column 33, which will not be described in detail here. The limiting column 33 is detachably connected to the column 6. When the jack 8 is unloaded and needs to be reset, the limiting column 33 can be detached. The other end of the limiting column 33 is hollow and provided with a plurality of first limiting holes 34, which can be inserted into a clamping column with a clamping jaw 37. Similarly, a plurality of second limiting holes are arranged on the side wall of the clamping column, the first limiting hole 34 and the second limiting hole cooperate, and the limiting nail 35 can be inserted for fixation. The embodiment of the present application can replace clamping jaws 37 of different sizes for clamping and fixing PVC plates on the side to strengthen the sample effect. In the embodiment of the present application, the clamping jaws 37 of different sizes can be replaced for clamping and fixing the thick-walled PVC sample 14 on the side, increasing the stability and strengthening the sample effect.

[0050] In another embodiment, a cutting structure is arranged on the limiting assembly 32 and can be extended out. In the embodiment of the present application, the other end of the limiting column 33 is solid and provided with a hidden groove 38 for retracting the cutting structure when not in use. The cutting structure of the embodiment of the present application is similar to a fruit knife, and the blade can be rotated out of the hidden groove 38. Different sizes of cutting and polishing knives 36 can be replaced. The cutting structure is added on both sides of the sample machine. The current technical solution in embodiment one produces samples with consistent thickness in each part, but for non-standard samples, such as edge chamfering, beveling, etc., secondary processing is required. The secondary processing structure such as the cutting structure can be arranged in the sample machine.

[0051] In summary, the application provides a thick-walled PVC pipe tensile specimen production machine tool, which can produce samples of large-diameter thick-walled pipes according to the shape of the test piece. The size of the produced sample meets the standard requirements and has precision. The sample preparation machine has a simple structure, small size, and is easy to operate. The tensile detection requirements of the sample. The application uses a pressing die 7, which is moved up and down by a jack 8. The thick-walled PVC sample 14 is extruded and cut in the pressing die 7. A device for producing profile samples is provided. The sample preparation machine can replace the pressing die, prepare different types and models of samples, and produce samples of different sizes. Then the samples are subjected to tensile test detection. The application moves up and down around the jack 8 screw rod. After the sample is produced, the jack 8 is unloaded. The upright column spring 11 is arranged on the upright column 6 of the movable plate 2, and the movable plate 2 is pushed to the initial working state. The sample in the pressing die 7 is pushed out by the reset spring 10. Through the above repeated operation, multiple samples can be prepared, and the sample consistency is related to the pressing die 7.

[0052] The above are preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, equivalent changes made in accordance with the structure, shape, and principle of the application should be covered within the protection scope of the application.

Claims

1. A simple sample preparation machine for thick-walled PVC pipe test specimens, characterized by, The upper die device and the lower positioning device are included, the lower positioning device includes a bottom plate (1), a movable plate (2), a gasket plate (5) and a jack (8), the upper die device includes an upper fixed plate (4), a connecting plate (3), a pressing die (7); the jack (8) and the bottom plate (1) are fixedly connected, under the action of the jack (8), the movable plate (2) can move up and down, the upper fixed plate (4) and the movable plate (2) are elastically connected, the gasket plate (5) and the movable plate (2) are fixedly connected; the pressing die (7) for sample preparation is arranged below the connecting plate (3); the upper die device is further provided with a sample plate demolding pin (9) and a reset spring (10), for automatically resetting the upper die device after sample preparation.

2. The simple sample preparation machine for thick-walled PVC pipe test pieces according to claim 1, characterized by The sample preparation machine is provided with a plurality of stand columns (6) connecting the bottom plate (1), the movable plate (2) and the upper fixed plate (4).

3. The simple sample preparation machine for thick-walled PVC pipe test pieces according to claim 2, characterized by The connecting stand column (6) between the upper fixed plate (4) and the movable plate (2) is provided with a stand column spring (11).

4. The simple sample preparation machine for thick-walled PVC pipe test pieces according to claim 3, characterized by The jack (8) is fixedly connected with the bottom plate (1); the gasket plate (5) is a non-metal gasket plate (5).

5. The simple sample preparation machine for thick-walled PVC pipe test specimens according to claim 4, characterized in that The upper fixed plate (4) and the connecting plate (3) are tightly connected through connecting bolts (12); the sample plate demolding pin (9) is arranged between the connecting plate (3) and the upper fixed plate (4), and the reset spring (10) is arranged on the sample plate demolding pin (9).

6. The simple sample preparation machine for thick-walled PVC pipe test pieces according to claim 5, characterized by The jack (8) is provided with a handle, so that the movable plate (2) can be lifted or lowered.

7. The simple sample preparation machine for thick-walled PVC pipe test specimens according to claim 1, characterized in that A plurality of cutting grooves (21) are arranged on the gasket plate (5), the pressing die is provided with a plurality of die pipes (22) and a pressing assembly; the bottom of the die pipe (22) is matched with the corresponding cutting groove (21).

8. The simple sample preparation machine for thick-walled PVC pipe test specimens according to claim 7, characterized in that The pressing assembly includes a plurality of piston columns (23), one end of the piston column (23) is arranged on the connecting plate (3), and the other end is inserted into the die pipe (22) and can move up and down.

9. The simple sample preparation machine for thick-walled PVC pipe test specimens according to claim 2, characterized in that, The side wall of the stand column (6) is provided with a limiting groove (31), and a detachable limiting assembly (32) is connected.

10. The simple sample preparation machine for thick-walled PVC pipe test specimens according to claim 9, characterized in that The limiting assembly (32) is provided with a retractable cutting structure or clamping structure.

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