WO2015101277A1 - 一种塑料挤出机熔断条检测方法及检测装置 - Google Patents

一种塑料挤出机熔断条检测方法及检测装置 Download PDF

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Publication number
WO2015101277A1
WO2015101277A1 PCT/CN2014/095488 CN2014095488W WO2015101277A1 WO 2015101277 A1 WO2015101277 A1 WO 2015101277A1 CN 2014095488 W CN2014095488 W CN 2014095488W WO 2015101277 A1 WO2015101277 A1 WO 2015101277A1
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WIPO (PCT)
Prior art keywords
strip
detecting
plastic extruder
broken
tensioning device
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PCT/CN2014/095488
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English (en)
French (fr)
Inventor
李东
陈智敏
张景晰
齐文良
刘炜
陈国雄
Original Assignee
天津金发新材料有限公司
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Application filed by 天津金发新材料有限公司 filed Critical 天津金发新材料有限公司
Priority to US15/109,575 priority Critical patent/US20160325481A1/en
Priority to DE112014005585.9T priority patent/DE112014005585T5/de
Priority to JP2016562055A priority patent/JP6374983B2/ja
Publication of WO2015101277A1 publication Critical patent/WO2015101277A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92066—Time, e.g. start, termination, duration or interruption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92295—Errors or malfunctioning, e.g. for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit

Definitions

  • the invention relates to the field of plastic extrusion granulation research, in particular to a plastic extruder flame strip detection method and a detection device.
  • the plastic extrusion granulation broken strip detection alarm mainly has the following three disadvantages: (1) Both infrared detection and pressure sensing have poor anti-interference ability, unreliable system, false alarm caused by misoperation or detection failure. Case. (2) Infrared detection, pressure sensing and conductive rods are relatively sophisticated detection devices. The purchase cost is high, and it is extremely easy to damage during cleaning, so it is not practical in plastic granulation production. (3) Both the pressure sensing and the conductive rod are contact type detecting devices. When the plastic is condensed on the detecting device, the detecting device is easily damaged and cannot be recycled, which ultimately leads to an increase in the use cost.
  • the main object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a method for detecting a fuse strip of a plastic extruder, which has the advantages of simple material, low cost, simple realization, good monitoring effect, and high promotion and application prospect. .
  • Another object of the present invention is to provide a method for detecting a fuse strip based on the above plastic extruder.
  • the measuring device has the advantages of simple structure and convenient configuration, and can automatically alarm externally when a broken strip occurs, and the monitoring effect is good, and has a high promotion and application prospect.
  • a method for detecting a fuse strip of a plastic extruder comprising the following steps:
  • test strip is placed directly below the discharge port of the plastic extruder, and the material of the test strip is the material of the product currently being produced by the plastic extruder or the material having similar melting performance to the product being produced;
  • the detecting strip is fixed on the strip holder, and at least one end of the strip holder is pressed or tensioned by a pre-tightening force. Therefore, when the detecting strip becomes a high elastic state, it is easier to be broken.
  • one end of the strip bracket is a locking device, and the other end is a tensioning device.
  • One end of the spring is fixed at the end of the tensioning device, and the other end is fixed on the strip holder, and is in a stretched state during normal detection.
  • the step of detecting whether the detecting strip is broken is: two contact detectors are arranged on the side of the strip holder, and in the normal detection, the end of the tensioning device and one of the ends When the contact detector is in contact, the spring is reset after the detection strip is broken, and the tensioning device is simultaneously connected with the two contact detectors under the action of the spring force, thereby forming a contact circuit with the sound and light alarm device, and the sound and light alarm device is externally Sound and light alarms.
  • a detecting device based on the above-mentioned method for detecting a fuse strip of a plastic extruder comprising a detecting strip, a strip holder, two contact detectors and an audible and visual alarm device, and the material of the detecting strip is the current plastic extruder
  • the material support comprises a locking device and a tensioning device, and in normal operation, the two ends of the detecting strip are respectively fixed to the locking device and tightened
  • the device, the tensioning device applies an upward or downward pre-tightening force to the detecting strip, the detecting strip is located directly below the discharge opening of the extruder, and the end of the tensioning device is in contact with one of the contact detectors;
  • the detecting strip is blown or broken, and the tensioning device moves under the pre-tightening force, so that the tensioning device simultaneously with the two contact detectors Contact, and thus form
  • the strip holder is disposed on both sides of the upper end of the water tank, and the distance between the detecting strip and the water surface in the water tank is 5 mm to 150 mm. After the test strip is blown, it is directly dropped into the water tank to avoid the risk of burns and the safety of the device.
  • the distance is 10 mm to 30 mm.
  • a spring is fixed to the end of the tensioning device, and the other end of the spring is fixed on the material holder, and the spring is in a stretched state during normal detection.
  • the present invention has the following advantages and beneficial effects:
  • the device of the invention has simple structure and convenient configuration, can automatically alarm externally when a broken strip occurs, and reminds the staff to clean up in time, which not only improves the output rate and production efficiency of the finished product, but also saves the labor cost of inspection and monitoring, and can also improve Product quality, reduce loss and waste, have a high promotion and application prospects.
  • the method of the invention has high stability, and only when the detecting strip is blown due to the residual heat of the broken strip, the two contact detectors are turned on, and then the external alarm is outputted to avoid false alarms.
  • the detecting strip and the strip holder which are easily accessible to the operator during operation are not easily damaged and have high practicability.
  • the material used for the test strip in the present invention may be a product being produced, so that the strip can be taken as a material during production, so the use cost is low, and even if the test strip is broken or remains in the product, it will not cause Quality hazards.
  • Figure 1 is a schematic view showing the structure of the apparatus of the present invention.
  • the method and the detection device for the fuse strip of the plastic extruder of the present embodiment are auxiliary detection methods and detection devices applied in the process of plastic extrusion granulation.
  • the structure of the device is specifically as shown in FIG. 1 , and includes a detecting strip 1 .
  • the strip holder, the two contact detectors 4 and the sound and light alarm device, the material of the detecting strip is the material of the product currently being produced by the plastic extruder or the material having similar melting performance to the product being produced;
  • the strip bracket includes The locking device 2 and the tensioning device 3, when the detection is to be started, the two ends of the detecting strip 1 are respectively fixed to the locking device 2 and the tensioning device 3, and a spring 5 is arranged at the tensioning device for The test strip 1 applies an upward or downward preload, and the test strip 1 is located directly below the discharge opening of the extruder.
  • the end of the tensioning device 3 is in contact with one of the contact detectors 4; when the broken strip falls from the discharge port of the extruder onto the detecting strip 1, the detecting strip 1 is blown or broken, and the tensioning device 3 is The pre-tightening force is moved, so that the tensioning device 3 simultaneously contacts the two contact detectors 4, thereby forming a contact circuit with the sound and light alarm device.
  • the spring is in a stretched state under normal operating conditions.
  • the broken strip falls from the discharge port of the extruder onto the detecting strip 1, the detecting strip 1 is melted, and the tensioning device 3 moves downward under the tension of the spring to reset the spring.
  • the strip holder is disposed at the upper end of the water tank 6, the locking device 2, and the locking device 3 are respectively disposed on both sides of the water tank, and the distance between the detecting strip 1 and the water surface of the water tank 6 is 30 mm. In practical applications, this distance can be considered comprehensively based on the size of the sink and the temperature of the broken strip.
  • the material used for the test strip can be either the material of the product currently being produced by the plastic extruder or the material having similar melting properties to the product being produced. It can be a PP-based product, a PS-based product, etc., and the "melting performance is similar" as used herein means that the detecting strip can be blown or broken under the residual heat of the broken strip. If the melting performance is too high, the test strip cannot be blown, so the purpose of the test is not achieved. If the melting performance is too low, and the substance that is not broken is in contact with the detecting strip, the detecting device will also alarm.
  • the purpose of the locking device is to fix one end of the detecting strip, and may have a pre-tightening force or a pre-tightening force. If a mechanism without pre-tightening force is used, ordinary bolts, splints, etc.
  • the device can be used as a locking device. If a pre-tightening mechanism is used, a spring that is stretched or compressed can be added to the above-mentioned device, so that the detecting strip can be pulled off easily when it is in a high elastic state. Similarly, the operator can also use a cam structure with a spring to achieve tension by changing the radius of the track.
  • the tensioning structure in this embodiment is to apply an upward or downward biasing force to the detecting strip while fixing one end of the detecting strip, that is, to tighten.
  • tensioning devices as are known in the prior art can be used, for example, a cam structure with a spring can be used, by changing the track track Radius to achieve tension.
  • the method of the embodiment is: before the granulation of the extruder, the test strip is fixed on the strip holder by the locking device and the tensioning device, and the position is located below the extruder head, when When there is a broken strip in the extrusion granulation production, the broken strip is first pulled on the horizontal detecting strip, and the detecting strip continuously absorbs heat from the broken strip until the temperature rises above its glass transition temperature, and the detecting strip is detected.
  • the molecular form also changes from a glassy state to a highly elastic state.
  • the tensile force that can be withstood by the cross section of the detecting strip is getting smaller and smaller until it is pulled off by the tensioning device connected to the spring on the side of the water tank, so that the spring is reset, thereby driving the tensioning device and the side wall of the material holder
  • the two contact detectors mounted on the top form a contact loop, and the audible and visual alarm device is also in this loop, thereby outputting an audible and visual alarm.
  • the sound and light alarm can be output, and the pneumatic scissors can be controlled to automatically cut the strip. It is also possible to wait for the operator to find the abnormality of the broken bar in time after the sound and light alarm is detected, so as to avoid the generation of large blocks and interrupt the production process. After the operator has handled the abnormality, the new detection strip can be fixed on the strip holder by the locking device and the tightening device to realize the next detection.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

本发明公开了一种塑料挤出机熔断条检测方法及检测装置，该方法是将检测用料条放置于塑料挤出机出料口正下方，检测用料条的材料为当前塑料挤出机正在生产的产品的材料或者与正在生产的产品熔化性能相近的材料；一旦生产过程中出现断条时，断条落在上述检测用料条上，断条的余热将检测用料条加热至其玻璃化温度，从而检测用料条由常温时的玻璃态变为高弹态，直至被拉断或熔断；检测到检测用料条断裂后，对外报警。该检测装置包括检测用料条、料条支架、接触探测器和声光报警装置，料条支架一端对检测用料条施加向上或向下的预紧力。本发明结构简单，配置方便，能够节省人工成本，提高产品质量，减少损失浪费，有很高的推广应用前景。

Description

一种塑料挤出机熔断条检测方法及检测装置 技术领域
本发明涉及塑料挤出造粒研究领域，特别涉及一种塑料挤出机熔断条检测方法及检测装置。
背景技术
目前，在塑料挤出造粒生产工艺过程中，由于原材料性能不稳定、混料不均一、工艺波动等因素的影响，经常会出现断条等异常情况，如果生产过程中出现了断条异常，而操作人员又不能及时发现该异常并进行处理的话，则断条会影响机头的其余料条，从而最终形成大块料，这样不但影响了生产进度，还浪费了物料，增加了人力、物力和生产成本。
为了能够在刚开始断条时就检测到断条并及早地通知操作人员进行处理，目前已提出研究一些断条报警器。这些报警器的检测方式各不相同，有的采用红外检测方式，有的采用压力传感器方式，有的采用导电杆传导方式，虽然原理上可行，但是上述方式均不太适用于塑料挤出造粒这种工艺复杂、工况又不好的生产过程，所以没有得到很大的推广。
目前的塑料挤出造粒断条检测报警器主要存在以下三个缺点：(1)无论是红外检测还是压力传感都存在抗干扰能力差、系统不可靠，误操作或检测失效导致的误报警的情况。(2)红外检测、压力传感和导电杆都是比较精密的检测装置，购买成本较高，在清机时极容易损坏，所以在塑料造粒生产时不实用。(3)压力传感和导电杆均是接触式检测装置，塑料凝结在检测装置上极易造成检测装置损坏，不能循环使用，最终导致使用成本上升。
发明内容
本发明的主要目的在于克服现有技术的缺点与不足，提供一种塑料挤出机熔断条检测方法，该方法取材简单、成本低，实现简单，且监控效果好，有较高的推广应用前景。
本发明的另一目的在于提供一种基于上述塑料挤出机熔断条检测方法的检 测装置，该装置结构简单，配置方便，在出现断条时能够自动对外报警，监控效果好，有较高的推广应用前景。
本发明的目的通过以下的技术方案实现：一种塑料挤出机熔断条检测方法，包括以下步骤：
(1)将检测用料条放置于塑料挤出机出料口正下方，检测用料条的材料为当前塑料挤出机正在生产的产品的材料或者与正在生产的产品熔化性能相近的材料；
(2)一旦生产过程中出现断条时，断条落在上述检测用料条上，断条的余热将检测用料条加热至其玻璃化温度，从而检测用料条由常温时的玻璃态变为高弹态，直至被拉断或熔断；
(3)检测到检测用料条断裂后，对外报警。
更进一步的，所述检测用料条固定在料条支架上，料条支架至少一端是通过预紧力进行压紧或拉紧。从而在检测用料条变为高弹态时，更易于被拉断。
具体的，所述料条支架一端为锁紧装置，另一端为拉紧装置，一弹簧一端固定在拉紧装置末端，另一端固定在料条支架上，在正常检测时处于拉伸状态。
更进一步的，所述步骤(3)中，检测检测用料条是否断裂的步骤是：在料条支架的侧面设置有两个接触探测器，在正常检测时，拉紧装置的末端与其中一个接触探测器相接触，当检测用料条断裂后，弹簧复位，拉紧装置在弹簧弹力的作用下同时与两个接触探测器相连，从而与声光报警装置形成接触回路，声光报警装置对外进行声光报警。
一种基于上述塑料挤出机熔断条检测方法的检测装置，包括检测用料条、料条支架、两个接触探测器和声光报警装置，检测用料条的材料为当前塑料挤出机正在生产的产品的材料或者与正在生产的产品熔化性能相近的材料；料条支架包括锁紧装置、拉紧装置，在正常工作时，检测用料条的两端分别固定在锁紧装置和拉紧装置，拉紧装置处对检测用料条施加向上或向下的预紧力，检测用料条位于挤出机出料口正下方，拉紧装置的末端与其中一个接触探测器接触；在断条从挤出机出料口落到检测用料条上时，检测用料条被熔断或拉断，拉紧装置在预紧力作用下移动，从而拉紧装置同时与两个接触探测器相接触，进而与声光报警装置形成接触回路。从而实现在发生挤出造粒断条时，自动对外进行声光报警。
优选的，所述料条支架设置在一水槽上端两侧，检测用料条与水槽中水面的距离为5mm～150mm。在检测用料条被熔断后，直接掉入水槽中，从而避免发生烫伤等危险，提高装置的安全性。
更进一步的，所述距离为10mm～30mm。
优选的，所述拉紧装置末端固定一个弹簧，弹簧的另一端固定在料条支架上，在正常检测时弹簧处于拉伸状态。
本发明与现有技术相比，具有如下优点和有益效果：
1、本发明装置结构简单，配置方便，在出现断条时能够自动对外报警，提醒员工及时进行清理，不仅提高了成品的产出率和生产效率，节省了检查监视的人工成本，还可以提高产品质量，减少损失浪费，有较高的推广应用前景。
2、本发明方法稳定性高，只有在检测用料条因为断条的余热导致熔断时，两个接触探测器才会被接通，进而才会对外输出报警，避免出现误报警。
3、本发明中，操作人员在操作时容易接触到的检测用料条、料条支架都不会轻易损坏，实用性强。
4、本发明中检测用料条采用的材料可以是正在生产的产品，从而可以在生产时截取料条作为材料，所以使用成本低，即使检测用料条断裂或者残留在产品中也不会造成品质隐患。
附图说明
图1是本发明装置的结构示意图。
其中：1-检测用料条；2-锁紧装置；3-拉紧装置；4-接触探测器；5-弹簧；6-水槽。
具体实施方式
下面结合实施例及附图对本发明作进一步详细的描述，但本发明的实施方式不限于此。
实施例1
本实施例塑料挤出机熔断条检测方法及检测装置是应用在塑料挤出造粒过程中的辅助检测方法和检测装置。装置结构具体如图1所示，包括检测用料条1、 料条支架、两个接触探测器4和声光报警装置，检测用料条的材料为当前塑料挤出机正在生产的产品的材料或者与正在生产的产品熔化性能相近的材料；料条支架包括锁紧装置2、拉紧装置3，在要开始进行检测时，检测用料条1的两端分别固定在锁紧装置2和拉紧装置3，拉紧装置处设置一个弹簧5，用于对检测用料条1施加向上或向下的预紧力，检测用料条1位于挤出机出料口正下方。拉紧装置3的末端与其中一个接触探测器4接触；在断条从挤出机出料口落到检测用料条上1时，检测用料条1被熔断或拉断，拉紧装置3在预紧力作用下移动，从而拉紧装置3同时与两个接触探测器4相接触，进而与声光报警装置形成接触回路。
本实施例中，在正常工作状态下，弹簧处于拉伸状态。断条从挤出机出料口落到检测用料条1上，检测用料条1被熔断，拉紧装置3在弹簧拉紧作用下进行向下运动，使弹簧复位。
本实施例中，料条支架设置在一水槽6上端，锁紧装置2、把手拉紧装置3分别设置于水槽的两侧，检测用料条1与水槽6中水面的距离为30mm。在实际应用中，这一距离可根据水槽的大小、断条的温度等综合考虑。
本实施例中，检测用料条所采用的材料既可以为当前塑料挤出机正在生产的产品的材料也可以为与正在生产的产品熔化性能相近的材料。可以为PP类产品、PS类产品等，这里所述的“熔化性能相近”是指检测用料条能够在断条余热作用下被熔断或拉断。如果熔化性能太高则会导致检测用料条不能被熔断，因此达不到检测的目的。熔化性能太低，又有可能会导致不是断条的物质接触到检测用料条上时，该检测装置也会对外报警。
本实施例中，锁紧装置的目的是为了将检测用料条一端进行固定，可以有预紧力，也可以没有预紧力，如果采用没有预紧力的机构，则普通的螺栓、夹板等装置即可作为锁紧装置来使用。如果采用有预紧力的机构，则可以在上述装置的基础上，添加一处于拉伸或者压缩的弹簧，从而可以在检测用料条处于高弹态更容易被拉断。同样，操作人员也可以采用带弹簧的凸轮结构，通过改变料条轨道半径来实现拉紧。
同理，本实施例中的拉紧结构的目的是为了将检测用料条一端进行固定的同时，还对检测用料条施加向上或向下的预紧力，即为拉紧。可以采用多种现有技术中已有的这种拉紧装置，例如可以采用带弹簧的凸轮结构，通过改变料条轨道 半径来实现拉紧。
本实施例的方法是：在挤出机造粒开机拉条前，将检测用料条通过锁紧装置和拉紧装置固定在料条支架上，位置位于横在挤出机机头下方，当挤出造粒生产出现断条时，断条首先耷拉在横着的检测用料条上，检测用料条不断地从断条中吸热直至温度上升到其玻璃化温度以上，检测用料条的分子形体也由玻璃态变为高弹态。在这个过程中，检测用料条截面上可承受的拉力越来越小直至其被水槽一侧与弹簧连接的拉紧装置拉断，这样弹簧复位，进而带动拉紧装置与料条支架侧壁上安装的两个接触探测器形成接触回路，声光报警装置同样在此回路中，从而输出声光报警。
在实际应用中，输出声光报警的同时，可以控制气动剪刀自动将料条剪断。也可以等操作人员发现声光报警后由其及时处理断条异常，以避免产生大块料，中断生产过程。操作人员处理完异常，可以通过锁紧装置和把手拉紧装置再次将一新的检测用料条固定在料条支架上，以实现下次检测。
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。

Claims (8)

  1. 一种塑料挤出机熔断条检测方法，其特征在于，包括以下步骤：
    (1)将检测用料条放置于塑料挤出机出料口正下方，检测用料条的材料为当前塑料挤出机正在生产的产品的材料或者与正在生产的产品熔化性能相近的材料；
    (2)一旦生产过程中出现断条时，断条落在上述检测用料条上，断条的余热将检测用料条加热至其玻璃化温度，从而检测用料条由常温时的玻璃态变为高弹态，直至被拉断或熔断；
    (3)检测到检测用料条断裂后，对外报警。
  2. 根据权利要求1所述的塑料挤出机熔断条检测方法，其特征在于，所述检测用料条固定在料条支架上，料条支架至少一端是通过预紧力进行压紧或拉紧。
  3. 根据权利要求1所述的塑料挤出机熔断条检测方法，其特征在于，所述料条支架一端为锁紧装置，另一端为拉紧装置，一弹簧一端固定在拉紧装置末端，另一端固定在料条支架上，在正常检测时处于拉伸状态。
  4. 根据权利要求1所述的塑料挤出机熔断条检测方法，其特征在于，所述步骤(3)中，检测检测用料条是否断裂的步骤是：在料条支架的侧面设置有两个接触探测器，在正常检测时，拉紧装置的末端与其中一个接触探测器相接触，当检测用料条断裂后，弹簧复位，拉紧装置在弹簧弹力的作用下同时与两个接触探测器相连，从而与声光报警装置形成接触回路，声光报警装置对外进行声光报警。
  5. 一种塑料挤出机熔断条检测装置，其特征在于，包括检测用料条、料条支架、两个接触探测器和声光报警装置，检测用料条的材料为当前塑料挤出机正在生产的产品的材料或者与正在生产的产品熔化性能相近的材料；料条支架包括锁紧装置、拉紧装置，在正常工作时，检测用料条的两端分别固定在锁紧装置和拉紧装置，拉紧装置处对检测用料条施加向上或向下的预紧力，检测用料条位于挤出机出料口正下方，拉紧装置的末端与其中一个接触探测器接触；在断条从挤出机出料口落到检测用料条上时，检测用料条被熔断或拉断，拉紧装置在预紧力作用下移动，从而拉紧装置同时与两个接触探测器相接触，进而与声光报警装置形成接触回路。
  6. 根据权利要求5所述的塑料挤出机熔断条检测装置，其特征在于，所述 料条支架设置在一水槽上端两侧，检测用料条与水槽中水面的距离为5mm～150mm。
  7. 根据权利要求6所述的塑料挤出机熔断条检测装置，其特征在于，所述距离为10mm～30mm。
  8. 根据权利要求5所述的塑料挤出机熔断条检测装置，其特征在于，所述拉紧装置末端固定一个弹簧，弹簧的另一端固定在料条支架上，在正常检测时弹簧处于拉伸状态。
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