MDI and PTMG supply system for producing high-resilience polyurethane

Abstract

The utility model provides an MDI (methylene diphenyl diisocyanate) and PTMG (polytetramethylene glycol) supply system for producing high-resilience polyurethane, which is used for connecting a production system and comprises a PTMG supply tank, the device is characterized by further comprising an MDI storage tank, an MDI elevated tank, an MDI supply tank, a first delivery pump, a second delivery pump, a third delivery pump, an electromagnetic valve, a first automatic regulating valve, a first filter, a second filter, a first mass flow meter, a second mass flow meter, a mixer and a controller, a liquid level meter is arranged in the MDI elevated tank; the controller is electrically connected with the first conveying pump, the electromagnetic valve, the second conveying pump, the third conveying pump, the first mass flow meter and the second mass flow meter, so that raw material supply is stable, manual operation is not needed, and the process stability is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of MDI and PTMG supply system for producing high resilience polyurethane. BACKGROUND

[0002] In spandex production, MDI is mixed with PTMG as main raw material to participate in polymerization reaction, and MDI and PTMG polymerization reaction is precisely delivered by delivery pump and flow meter according to certain ratio, therefore, stable MDI flow delivery is extremely important for polymerization reaction, and directly determines the stability of the entire spandex process.

[0003] In actual production, MDI supply tank liquid level fluctuation can cause MDI supply pump frequency change, and MDI supply pump frequency change can cause MDI flow fluctuation. MDI in MDI supply tank is automatically replenished by MDI high tank, and too low or too high high tank liquid level directly affects MDI replenishment speed of supply tank, thereby affecting MDI liquid level in supply tank, causing MDI flow fluctuation, therefore, MDI high tank liquid level stability indirectly affects process stability. At present, MDI replenishment in MDI high tank is manually controlled by artificial, and this process needs artificial frequent operation, if operation is forgotten, MDI high tank can be blown, MDI flows into other storage tanks through reverse nitrogen gas pipeline, causing major process accidents and losses, or causing MDI high temperature tank liquid level to be too low, causing replenishment speed to slow down, causing product process fluctuation, and reducing product quality. UTILITY MODEL CONTENTS

[0004] The utility model solves technical problems, and provides a kind of MDI and PTMG supply system for producing high resilience polyurethane, so that raw material supply is stable, without artificial operation, and process stability is guaranteed.

[0005] The utility model is implemented as follows: a kind of MDI and PTMG supply system for producing high resilience polyurethane, for connecting production system, including PTMG supply tank, further including: MDI storage tank, MDI high tank, MDI supply tank, first delivery pump, second delivery pump, third delivery pump, electromagnetic valve, first automatic regulating valve, first filter, second filter, first mass flow meter, second mass flow meter, mixer and controller.

[0006] The MDI storage tank is connected to one end of the electromagnetic valve through a first conveying pump, the other end of the electromagnetic valve is connected to the MDI head tank through a first filter, the MDI head tank is connected to the supply tank through the first automatic regulating valve, the supply tank is connected to the second filter through a second conveying pump, the second filter is connected to the mixer through a first mass flow meter; the PTMG supply tank is connected to the mixer through a third conveying pump and a second mass flow meter, and the mixer is used for mixing MDI raw materials and PTMG raw materials and then supplying a production system.

[0007] A liquid level gauge is arranged in the MDI head tank; and the controller is electrically connected to the first conveying pump, the electromagnetic valve, the second conveying pump, the third conveying pump, the first mass flow meter and the second mass flow meter.

[0008] Further, the first pressure gauge and the second pressure gauge are arranged at two ends of the first filter, and the controller is electrically connected to the first pressure gauge and the second pressure gauge respectively.

[0009] Further, the first manual valve, the second manual valve, the third manual valve and the fourth manual valve are arranged between the MDI storage tank and the first conveying pump, at two ends of the electromagnetic valve, and between the first filter and the MDI head tank.

[0010] Further, the fifth manual valve and the sixth manual valve are arranged at two ends of the first automatic regulating valve.

[0011] Further, the seventh manual valve, the eighth manual valve and the ninth manual valve are arranged between the second filter, and the eighth manual valve is arranged between the first mass flow meter and the mixer.

[0012] Further, the tenth manual valve and the eleventh manual valve are arranged at two ends of the second mass flow meter.

[0013] The MDI and PTMG supply system for producing high-rebound polyurethane has the advantages that the MDI head tank realizes automatic material supplement, avoids liquid level fluctuation of the MDI head tank caused by manual operation, and ensures the stability of the whole process; and avoids production safety accidents caused by manual operation errors. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described in connection with the embodiments and with reference to the drawings.

[0015] Figure 1 is a principle block diagram of an MDI and PTMG supply system for producing high resilience polyurethane. DETAILED DESCRIPTION

[0016] Please refer to Figure 1 The utility model discloses a kind of MDI and PTMG supply systems for producing high resilience polyurethane, for connecting production system 101, including PTMG feed tank 102, MDI storage tank 103, MDI high tank 104, MDI feed tank 105, first delivery pump 106, second delivery pump 107, third delivery pump 108, solenoid valve 109, first automatic regulating valve 110, second automatic regulating valve 111, first filter 112, second filter 113, first mass flow meter 114, second mass flow meter 115, mixer 116 and controller (not shown in the figure);The controller is single-chip microcontroller or PC etc., can be directly purchased from market and used;First automatic regulating valve 110 and second automatic regulating valve 111 are market existing, directly purchase and use;First mass flow meter 114 and second mass flow meter 115 are market existing, directly purchase and use;

[0017] The MDI storage tank 103 is connected to one end of the solenoid valve 109 through the first delivery pump 106, the other end of the solenoid valve 109 is connected to the MDI high tank 104 through the first filter 112, the MDI high tank 104 is connected to the feed tank 105 through the first automatic regulating valve 110, the feed tank 105 is connected to the second filter 113 through the second delivery pump 107, the second filter 113 is connected to the mixer 116 through the first mass flow meter 114;The PTMG feed tank 102 is connected to the mixer 116 through the third delivery pump 108 and the second mass flow meter 115, the mixer 116 is used for mixing MDI raw materials and PTMG raw materials, and then supplying production system 101;The second automatic regulating valve 111 is used for connecting PTMG feed tank 102 and external PTMG raw materials, and the second automatic regulating valve 111 can be automatically opened and closed according to the set parameters, to ensure that the raw materials in the PTMG feed tank remain stable;

[0018] A liquid level gauge 1041 is arranged in the MDI high tank.

[0019] After the MDI raw material is sent into the MDI storage tank 103, it enters the MDI high tank 104 through the first conveying pump 106. At this time, the liquid level of the MDI high tank 104 is obtained by the liquid level meter 1041. When the liquid level reaches the set height, the electromagnetic valve 109 is closed, and the first conveying pump 106 is controlled to stop running. When the liquid level meter 1041 obtains that the liquid level in the MDI high tank 104 reaches the set low level, the electromagnetic valve 109 is opened, and the first conveying pump 106 is controlled to be opened, so that the MDI raw material in the MDI storage tank 103 enters the MDI high tank 104.

[0020] In the embodiment, preferably, the first pressure gauge 117 and the second pressure gauge 118 are further included, which are arranged at two ends of the first filter 112, and the controller is electrically connected with the first pressure gauge 117 and the second pressure gauge 118 respectively. The pressure difference between the first pressure gauge 117 and the second pressure gauge 118 can be used to know whether the first filter 112 is blocked, and the controller can timely inform the user to replace the filter element of the first filter 112.

[0021] In the embodiment, preferably, the first manual valve 119, the second manual valve 120, the third manual valve 121 and the fourth manual valve 122 are further included, the first manual valve 119 is arranged between the MDI storage tank 103 and the first conveying pump 106, the second manual valve 120 and the third manual valve 121 are arranged at two ends of the electromagnetic valve 109, and the fourth manual valve 122 is arranged between the first filter 112 and the MDI high tank 104. The first manual valve 119, the second manual valve 120, the third manual valve 121 and the fourth manual valve 122 are all normally open valves.

[0022] In the embodiment, preferably, the fifth manual valve 123 and the sixth manual valve 124 are further included, which are arranged at two ends of the first automatic regulating valve 110. If the first automatic regulating valve 110 fails, the fifth manual valve 123 and the sixth manual valve 124 can be closed at the same time, and then the first automatic regulating valve 110 can be disassembled for replacement or repair. The fifth manual valve 123 and the sixth manual valve 124 are normally open valves.

[0023] In the embodiment, preferably, a seventh manual valve 125 and an eighth manual valve 126 are arranged between the second filter 113, and a ninth manual valve 127 is arranged between the first mass flow meter 114 and the mixer 116, the closing of the seventh manual valve 125 and the eighth manual valve 126 can be used for maintenance or replacement of the second filter 113, and the closing of the eighth manual valve 126 and the ninth manual valve 127 can be used for maintenance or replacement of the first mass flow meter 114, the seventh manual valve 125, the eighth manual valve 126 and the ninth manual valve 127 are normally open valves.

[0024] In the embodiment, preferably, a tenth manual valve 128 and an eleventh manual valve 129 are arranged at two ends of the second mass flow meter 115, and the simultaneous closing of the tenth manual valve 128 and the eleventh manual valve 129 can be used for maintenance or replacement of the second mass flow meter 115, the tenth manual valve 128 and the eleventh manual valve 129 are normally open valves.

[0025] A twelfth manual valve 130 is arranged at the bottom of the MDI supply tank 105 and connected to the second delivery pump 107 through the twelfth manual valve 130, and a thirteenth manual valve 131 is arranged at the bottom of the PTMG supply tank 102 and connected to the third delivery pump 108 through the thirteenth manual valve 131, the twelfth manual valve 130 is arranged for maintenance of the MDI supply tank 105, and the thirteenth manual valve 131 is arranged for maintenance of the PTMG supply tank 102, and the twelfth manual valve 130 is a normally open valve.

[0026] A fourteenth manual valve 132 and a fifteenth manual valve 133 are arranged at two ends of the second automatic regulating valve 111 and used for maintenance or replacement of the second manual regulating valve 111, and the fourteenth manual valve 132 and the fifteenth manual valve 133 are normally open valves.

[0027] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described by us are only illustrative, not for limiting the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. An MDI and PTMG supply system for producing high-resilience polyurethane, for connecting to a production system, comprising a PTMG supply tank, characterized in that: Also includes: MDI storage tank, MDI high-level tank, MDI supply tank, first transfer pump, second transfer pump, third transfer pump, solenoid valve, first automatic regulating valve, first filter, second filter, first mass flow meter, second mass flow meter, mixer, and controller; The MDI storage tank is connected to one end of the solenoid valve via a first delivery pump. The other end of the solenoid valve is connected to the MDI high-level tank via a first filter. The MDI high-level tank is connected to the supply tank via a first automatic regulating valve. The supply tank is connected to the second filter via a second delivery pump. The second filter is connected to the mixer via a first mass flow meter. The PTMG supply tank is connected to the mixer via a third delivery pump and a second mass flow meter. The mixer is used to mix MDI and PTMG raw materials before supplying them to the production system. The MDI high-level tank is equipped with a level gauge; the controller is electrically connected to the first delivery pump, the solenoid valve, the second delivery pump, the third delivery pump, the first mass flow meter, and the second mass flow meter.

2. The MDI and PTMG supply system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes a first pressure gauge and a second pressure gauge, which are located at both ends of the first filter, and the controller is electrically connected to the first pressure gauge and the second pressure gauge respectively.

3. The MDI and PTMG supply system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes a first manual valve, a second manual valve, a third manual valve and a fourth manual valve. The first manual valve is located between the MDI storage tank and the first delivery pump. The second and third manual valves are located at both ends of the solenoid valve. The fourth manual valve is located between the first filter and the MDI high-level tank.

4. The MDI and PTMG supply system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes a fifth manual valve and a sixth manual valve, which are located at both ends of the first automatic regulating valve.

5. The MDI and PTMG supply system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes a seventh manual valve, an eighth manual valve, and a ninth manual valve, wherein the seventh and eighth manual valves are located between the second filter, and the eighth manual valve is located between the first mass flow meter and the mixer.

6. The MDI and PTMG supply system for producing high-resilience polyurethane as described in claim 1, characterized in that: It also includes a tenth manual valve and an eleventh manual valve, which are located at both ends of the second mass flow meter.

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