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[供應]管材負壓試驗機
1、功能:
管材負壓試驗機是根據管材在在實際應用中的工作條件的要求而設計、生產的，用于測定熱塑性管材、復合管材zui大負壓值，是塑料管材生產廠商及檢測機構*的檢測設備。此設備能夠充分體現企業的產品質量的水平。
2、符合標準：
GB/T19471.2-2004《塑料管道系統 硬聚氯乙烯管材彈性密封圈式承口接頭 負壓密封試驗方法》、 ISO 13844：2000
3、基本原理：
將塑料管插口管段插入塑料管承口管段，使兩管段的軸線偏角滿足規定角度，并使插口管段產生一定的形變，在規定的溫度范圍內，依次向試樣施加兩個規定的負內壓，在規定的測試時間內觀察試樣的密封情況。
工作架：
至少包括兩個緊固裝置，其中一個是可調節的，在向試樣施加負壓（相對真空）的同時，可以使試樣接頭處產生一定的偏轉角度。
夾具：可以在距離承口管段端面規定距離處的插口管段上，施加一個變形力。
真空泵：能施加并保持兩個規定的負壓。
隔離閥：安裝在真空泵和試樣之間。
試樣：
選擇適當的尺寸，管材的平均外徑dem，應是在公差范圍內的zui小值，并且承口尺寸（平均內徑dem和放密封圈的密封槽的直徑）盡量取符合制造商規定的zui大值。
插口管段的自由長度L，是指承口端面和插口管段密封接頭端面的距離，等于5倍的公稱外徑dn，插口管段的自由長度Lzui小為500mm，zui大為1500mm。
二、管材負壓試驗機組成及配置
1、 主機箱及控制系統--------1臺
2、 真空負壓泵--------------1套
3、 管材支架----------------1套
4、 管材夾具----------------配D225， D250兩套
5、 PLC可編程控制器---------1套
6、 漢字液晶觸摸屏----------1套
7、 隔離閥，安全閥----------各1套
三、性能指標及技術要求
1、適用管徑:315以下
2、德國BECKER真空泵主要參數：
型號
流量 m3/h@50Hz
zui大真空
mbar值
電機功率kW
轉速轉/分鐘@50Hz
U 4.40 SA/K
410
0.5
1.50
1450
5、顯示精度：0.0002MPa
6、壓力變送器:試驗壓力采樣頻率0.1毫秒
7、計時范圍：0—9999h
8、計時精度：1S
四、試驗方法和步驟：
（一）試驗方法
1、按相關標準要求，選擇試樣安裝在試樣架上。
2、將經過狀態調節后的試樣與加壓設備連接起來，然后根據試樣的材料、規格尺寸和加壓設備情況，當達到試驗-（0.01±0.002）Mpa（絕壓0.093±0.002 Mpa）時關閉負壓泵開始計時。如果負壓變化超過0.005MPa，停止試驗。
如果負壓變化不超過0.005 MPa，則對試樣繼續施加負壓，直到壓力達到－（0.08±0.002）MPa（絕壓0.023±0.002 Mpa）。斷開試樣與負壓泵，監控壓力15min，并記錄負壓的變化。
機器同時顯示壓力曲線的實時變化。
1, function:
Tubing negative pressure tester is according to the working conditions in the pipe in the practical application of the requirements and design, production, used for the determination ofthermoplastic pipe, composite pipe the maximum negative pressure, is the necessary testing equipment of plastic pipe manufacturers and testing agencies. This equipment can fully reflect the enterprise product quality level.
2, meet the standards:
GB/T19471.2-2004 "plastic piping system of hard polyvinyl chloride pipe elastic sealing ring typesocket connector negative pressure sealing test method", ISO 13844:2000
3, basic principle:
The plastic tube socket pipe section is inserted into a plastic socket pipe in pipe section, the twoaxis angle pipe section satisfies a prescribed angle, and the socket pipe section to produce a certain deformation, in the specified temperature range, applied successively two provisions to a sample of negative internal pressure, observe the conditions of sealing sample testing timespecified in in.
The work frame:
Include at least two fastening device, one of which is adjustable, in applying negative pressure to the specimen (relative vacuum) at the same time, can produce certain deflection angle and make specimen joints.
Fixture: can be at a distance of socket pipe segment end fixed distance socket pipe section,applying a deforming force.
Vacuum pump: negative pressure can exert and maintain two provisions.
Isolation valves: installed between the vacuum pump and the specimen.
Sample:
Select the appropriate size, the average diameter DEM pipe, should be the minimum value in thetolerance range, and socket size (average diameter DEM and put the seal ring groove diameter)as consistent with the maximum value specified by the manufacturer.
Free length L socket pipe section, refers to the socket end face and a socket pipe section joint seal end surface distance, equal to 5 times the nominal diameter DN, socket pipe section of the minimum free length of L is 500mm, the maximum is 1500mm.
Two, tubing negative pressure testing machine composition and configuration
1, mainframe and control system of --------1 platform
2, vacuum pump --------------1 set
3, pipe bracket ----------------1 set
4, pipe clamp ---- with D225, D250 two sets
5, the PLC programmable controller ---------1 set
6, Chinese LCD touch screen ----------1 set
7, the isolation valve, safety valve - 1 sets
Three, the performance index of tubing negative pressure testing machine and the technical requirements
1, applicable diameter: 315 the following
The main parameters of 2, Germany BECKER vacuum pump:
Model
Flow m3/h@50Hz
Maximum vacuum
The absolute value of mbar
Motor power kW
RPM / min @50Hz
U 4.40 SA/K
410
0.5
1.50
1450
5, the display precision: 0.0002MPa
6, the pressure transmitter: test pressure sampling frequency of 0.1 milliseconds
7, the timing range is 0 - 9999h
8, the accuracy of the time: 1S
Four, tubing negative pressure testing machine testing methods and steps:
(a) test method
1, according to the requirements of relevant standards, the choice of sample installed on the specimen shelf.
2, after the sample conditioning after connected with the pressure equipment, then according tothe specimen material, size and compression equipment, when to test - (0.01 + 0.002) Mpa(absolute pressure of 0.093 + 0.002 Mpa) closed negative pressure pump start time. If thepressure changes more than 0.005MPa, stop test.
If the pressure changes less than 0.005 MPa, the sample is to continue to exert negative pressure, until the pressure reaches - (0.08 + 0.002) MPa (absolute pressure of 0.023 + 0.002 Mpa). Disconnect the specimen and the negative pressure pump, the monitoring pressure 15min, and record the change of the negative pressure.
The machine and display the real-time change of pressure curve.
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