Polypropylene melt flow rate meter

Abstract

The invention relates to the technical field of detector bodies, in particular to a polypropylene melt flow rate meter which comprises a detector body, two sets of mouth mold calibration mechanisms arranged at the top of the detector body, a pressurization mechanism arranged on one set of mouth mold calibration mechanism and a feeding mechanism arranged on the other set of mouth mold calibration mechanism. The cylinder depth pairing mechanism is arranged on the detector body; and the in-cylinder vibration mechanism is arranged on the cylinder depth pairing mechanism. The two symmetrically-distributed mouth mold calibration mechanisms are arranged on the two sides of the charging barrel on the top of the detector body, after the two mouth mold calibration mechanisms are closed, the mouth mold is put into the charging barrel through a clamp, the two closed mouth mold calibration mechanisms are matched to conduct calibration and pressing on the placed mouth mold, forced pressurization on the mouth mold is matched, and therefore the mouth mold calibration accuracy is greatly improved. Therefore, the problem that the hole position is not precise due to heat flow and subsequent material adhesion is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of detector bodies, and specifically to a polypropylene melt flow rate instrument. Background Technique

[0002] The detector body, also known as a melt indexer, is used to measure the melt flow rate MFR value of various plastics and resins in the viscous flow state. It is applicable to engineering plastics with relatively high melting temperatures such as polycarbonate, polyarylsulfone, fluoroplastics, and nylon, as well as plastics with relatively low melting temperatures such as polyethylene (PE), polystyrene (PS), polypropylene (PP), ABS resin, polyoxymethylene (POM), and polycarbonate (PC) resin. It is widely used in industries such as plastic production, plastic products, and petrochemical industry.

[0003] Currently, during the actual use of the detector body, in addition to the optimization of the control system, there are still certain drawbacks in the steps of manual operation. Since a fixture is required to pre-install the die before the material is put into the barrel, the die will have inaccurate hole positions due to the interference of the heating flow in the barrel after pre-installation. At the same time, after the inside of the barrel is heated, the material will also have difficulty in falling due to temperature problems, and in severe cases, it will cause blockage of the die or the barrel.

[0004] In view of this, a polypropylene melt flow rate instrument is designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] For this reason, the technical solution adopted by the present invention is as follows: A polypropylene melt flow rate instrument, including a detector body, two sets of die calibration mechanisms arranged on the top of the detector body, a pressurizing mechanism arranged on one set of die calibration mechanisms, a feeding mechanism arranged on the other set of die calibration mechanisms, a barrel depth matching mechanism arranged on the detector body, and a barrel internal vibrating mechanism arranged on the barrel depth matching mechanism, and the barrel internal vibrating mechanism is located directly above the two sets of die calibration mechanisms; the barrel depth matching mechanism includes a lead screw and a support plate arranged outside the lead screw; the barrel internal vibrating mechanism includes a protective cover arranged at the other end of the support plate, a tapered head installed at the bottom of the protective cover, a plurality of resonance strip plates movably installed inside the tapered head, and an internal tension spring connected between the tapered head and the resonance strip plates; a barrel for placing the die is opened at the top end of the detector body, and after the plurality of resonance strip plates extend into the barrel, they are used to accelerate the falling efficiency of the material; the die calibration mechanism includes a discharge barrel cover that is turned over and penetrates into the barrel, and the number of discharge barrel covers is two.

[0007] In a preferred example, the present invention can be further configured as follows: The barrel depth matching mechanism further includes a bottom pad provided on the top of the detector body, a shaft rod installed in the bottom pad, a cross rail installed outside the bottom pad, a top pad movably installed outside the shaft rod, a shaft head installed outside the top pad, a traction frame movably installed on the shaft head, a locking member movably installed at the bottom end of the traction frame, and the locking member is movably installed in the cross rail, two jacket sleeves provided on the top of the top pad, two first bolts passing through the two jacket sleeves and connected to the inside of the top pad, a mother pipe fixedly installed in the two jacket sleeves, and a sub-rod movably installed in the mother pipe; The bottom end of the lead screw is movably installed in the two jacket sleeves.

[0008] In a preferred example, the present invention can be further configured as follows: The die calibration mechanism further includes a neck sleeve provided on the outer wall of the discharge barrel cover, and the number of the neck sleeves is two; The feeding mechanism includes a feed bin installed in one of the neck sleeves, a cover provided at the top end of the feed bin, a sieve plate provided inside the feed bin, an end plate provided on the outer wall of the feed bin, a pin block movably installed in the feed bin and pressing on the top of the sieve plate, a third spring connected between the pin block and the end plate, and a plug plate movably installed inside the feed bin and located directly below the sieve plate.

[0009] In a preferred example, the present invention can be further configured as follows: The pressurizing mechanism includes an air chamber provided in the other neck sleeve and a diversion cover provided at the top end of the air chamber.

[0010] In a preferred example, the present invention can be further configured as follows: The in-barrel vibrating mechanism further includes an inner support column installed on the top of the cone head, a waterproof rubber sleeve provided inside the cone head, a bracket provided inside the waterproof rubber sleeve, a pull rod movably installed at the top end of the bracket, a crankshaft movably installed inside the inner support column, and the pull rod is movably installed on the crankshaft, a pressurizing head fixedly installed at the bottom end of the bracket, a base fixedly installed on one side of the top of the cone head, and a motor installed inside the base, and the transmission shaft in the motor is installed on the crankshaft.

[0011] In a preferred example, the present invention can be further configured as follows: An arc-shaped cavity is formed inside the cone head, and after the arc-shaped cavity communicates with the inner cavity of the air chamber, it is used to improve the efficiency of the material entering the barrel.

[0012] In a preferred embodiment, the present invention can be further configured as follows: The die calibration mechanism further includes a fixed block disposed on the detector body, a second bolt passing through the fixed block and installed inside the detector body, a positioning rod installed on the top of the fixed block, two sliding plates installed on the top of the positioning rod, a plug installed on the top of the two sliding plates, a stability-enhancing pad member movably installed inside the two sliding plates, a cushion plate disposed outside the two sliding plates, a first spring installed between the cushion plate and the positioning rod, and the first spring is located outside the two first springs, a swivel joint movably installed at the inner end of the second lead screw, a cantilever movably installed on the cushion plate and the swivel joint, a drawer plate movably installed outside the cantilever, and a second spring disposed between the cantilever and the drawer plate.

[0013] In a preferred embodiment, the present invention can be further configured as follows: The outer surface of the conical head is coated with a heat-insulating paint layer, and a pressure relief notch is provided on the inner wall of the protective cover.

[0014] In a preferred embodiment, the present invention can be further configured as follows: The inner wall of the sliding plate is provided with a T-shaped vertical groove, and the sliding plate is made of stainless steel material. The stability-enhancing pad member is composed of two L-shaped legs and an outer pad, and the L-shaped legs are movably installed in the T-shaped vertical groove.

[0015] In a preferred embodiment, the present invention can be further configured as follows: The bottom end of the discharge cylinder cover is provided with a funnel-shaped hole, and the diameter of the bottom port of the two discharge cylinder covers after closing is the same as the diameter of the die.

[0016] By adopting the above technical solutions, the beneficial effects achieved by the present invention are as follows: 1. By symmetrically arranging two die calibration mechanisms on both sides of the material cylinder at the top of the detector body in the present invention, after the two sets of die calibration mechanisms are closed, the die is placed into the material cylinder by using a fixture, and the placed die is calibrated and pressed by the two sets of die calibration mechanisms after closing. Combined with the forced pressurization of the die, the problem of inaccurate hole positions caused by heat flow and subsequent material adhesion can be avoided.

[0017] 2. By arranging a vibratory mechanism inside the cylinder directly above the two sets of die calibration mechanisms after closing in the present invention, as the vibratory mechanism inside the cylinder is pressed and descends uniformly into the two sets of die calibration mechanisms, when the uniformly distributed multiple resonance strip plates vibrate at a high frequency, the materials fed into the material cylinder can be quickly vibrated down, thereby avoiding the problem of thermal melting blockage caused by the accumulation of materials in a certain area of the material cylinder being heated.

[0018] 3. By respectively arranging a pressurization mechanism and a feeding mechanism on the two sets of die calibration mechanisms in the present invention, after the feeding mechanism successfully feeds the materials into the material cylinder until the vibratory mechanism inside the cylinder descends into the two discharge cylinder covers, the air flow sent into the material cylinder by the pressurization mechanism can accelerate the heating speed of the instrument heating module and improve the falling efficiency of the materials at the same time. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the present invention when used; Figure 2 It is an explosion schematic diagram of the present invention; Figure 3 It is a schematic diagram of the barrel depth matching mechanism of the present invention; Figure 4 For the present invention Figure 3 A partial explosion diagram; Figure 5 It is a schematic diagram of the material vibrating mechanism in the cylinder of the present invention; Figure 6 It is a partial schematic diagram of the present invention; Figure 7 It is a schematic diagram of the pressurizing mechanism and the feeding mechanism of the present invention; Figure 8 It is an exploded schematic diagram of the die calibration mechanism of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of a local explosion.

[0020] Reference numerals: 100, barrel depth matching mechanism; 110, bottom pad; 1101, cross rail; 1102, shaft rod; 1103, top pad; 1104, shaft head; 1105, traction frame; 1106, locking piece; 120, first bolt; 130, jacket; 140, screw rod; 150, mother tube; 1501, sub-rod; 160, support plate; 200, vibrating material mechanism in the cylinder; 210, shield; 2101, cone head; 2102, arc cavity; 2103, inner support column; 2104, base; 2105, motor; 2106, crankshaft; 220, anti-seepage rubber sleeve; 230, bracket; 2301, pull rod; 2302, booster head; 240, resonance strip; 250, built-in tension spring; 300, detector body; 400, die calibration mechanism; 410, fixing block; 4101, second bolt; 4102, positioning rod; 4103, slide plate; 4104, plug; 4105, pad; 4106, first spring; 420, stabilizing pad; 430, second screw rod; 4301, adapter; 440, cantilever; 450, second spring; 460, drawer plate; 470, discharge barrel cover; 480, neck sleeve; 500, pressurization mechanism; 510, air chamber; 520, deflector; 600, feeding mechanism; 610, silo; 6101, end plate; 620, cover; 630, sieve plate; 640, plug plate; 650, pin block; 660, third spring. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention.

[0023] The following describes a polypropylene melt flow rate instrument provided by some embodiments of the present invention in conjunction with the accompanying drawings.

[0024] Embodiment 1: Combined Figures 1 to 9 As shown in the figure, a polypropylene melt flow rate instrument provided by the present invention includes a detector body 300, two sets of die calibration mechanisms 400 provided on the top of the detector body 300, a pressurizing mechanism 500 provided on one set of die calibration mechanisms 400, a feeding mechanism 600 provided on the other set of die calibration mechanisms 400, a barrel depth matching mechanism 100 provided on the detector body 300, and a barrel internal vibrating mechanism 200 provided on the barrel depth matching mechanism 100. The barrel internal vibrating mechanism 200 is located directly above the two sets of die calibration mechanisms 400. After the two sets of die calibration mechanisms 400 are closed, they are used to calibrate the die and provide an effective path for material transfer. The barrel internal vibrating mechanism 200 vibrates inside the two closed die calibration mechanisms 400, which is used to provide a high falling speed of the material and dredge the barrel inside the detector body 300. The pressurizing mechanism 500 is used to increase the heating speed inside the barrel and accelerate the falling of the material. The feeding mechanism 600 is used to screen the material to avoid blockage of the barrel and die caused by impurities in the material.

[0025] The barrel depth matching mechanism 100 includes a lead screw 140 and a support plate 160 provided outside the lead screw 140; The barrel internal vibrating mechanism 200 includes a shield 210 provided at the other end of the support plate 160, a conical head 2101 installed at the bottom of the shield 210, a plurality of resonance strip plates 240 movably installed inside the conical head 2101, an internal tension spring 250 connected between the conical head 2101 and the resonance strip plates 240, an inner support column 2103 installed at the top of the conical head 2101, an anti-seepage rubber sleeve 220 provided inside the conical head 2101, a bracket 230 provided inside the anti-seepage rubber sleeve 220, a pull rod 2301 movably installed at the top end of the bracket 230, a crankshaft 2106 movably installed inside the inner support column 2103, and the pull rod 2301 is movably installed on the crankshaft 2106. A pressurizing head 2302 is fixedly installed at the bottom end of the bracket 230, a base 2104 is fixedly installed on one side of the top of the conical head 2101, and a motor 2105 is installed inside the base 2104. The transmission shaft inside the motor 2105 is installed on the crankshaft 2106; The exterior of the conical head 2101 is coated with a heat-insulating paint layer, and pressure relief notches are provided on the inner wall of the shield 210; The die calibration mechanism 400 includes a discharge cylinder cover 470 that is turned over and penetrates into the cylinder, and the number of the discharge cylinder covers 470 is two, a fixing block 410 provided on the detector body 300, a second bolt 4101 that penetrates into the fixing block 410 and is installed in the detector body 300, a positioning rod 4102 installed on the top of the fixing block 410, two sliding plates 4103 installed on the top of the positioning rod 4102, a plug 4104 installed on the top of the two sliding plates 4103, a stability-enhancing pad member 420 movably installed inside the two sliding plates 4103, a cushion plate 4105 provided outside the two sliding plates 4103, a first spring 4106 installed between the cushion plate 4105 and the positioning rod 4102, and the first spring 4106 is located outside the two first springs 4106, a swivel joint 4301 movably installed at the inner end of the second lead screw 430, a cantilever 440 movably installed on the cushion plate 4105 and the swivel joint 4301, a drawer plate 460 movably installed outside the cantilever 440, and a second spring 450 provided between the cantilever 440 and the drawer plate 460; The inner wall of the sliding plate 4103 is provided with a T-shaped vertical groove, and the sliding plate 4103 is made of stainless steel. The stability-enhancing pad member 420 is composed of two L-shaped legs and an outer pad, and the L-shaped legs are movably installed in the T-shaped vertical groove; The bottom end of the discharge cylinder cover 470 is provided with a funnel-shaped hole, and the diameter width of the bottom port of the two discharge cylinder covers 470 after closing is the same as the die diameter width.

[0026] In the initial state, the two discharge cylinder covers 470 are turned outward and maintain a certain distance from the cylinder at the top of the detector body 300. When it is necessary to detect polypropylene, the two second lead screws 430 are pre-adjusted to reverse until the swivel joint 4301 at the inner end of the second lead screw 430 pushes the cantilever 440 to turn over. At this time, the cantilever 440 will approach the center of the cylinder along the cushion plate 4105 until the two discharge cylinder covers 470 form a closed state. At this time, the ports at the bottom ends of the two discharge cylinder covers 470 are symmetrical with the cylinder, and then the die is delivered to the cylinder by using a fixture; With the overall uniform descent of the vibrating material mechanism 200 in the cylinder, the two finally compressed discharge cylinder covers 470 will extend into the cylinder. The two discharge cylinder covers 470 will first press and fix the die. After multiple resonance strip plates 240 are inserted into the cylinder later, the vibrating resonance strip plates 240 will not interfere with the die. At the same time, the material put into the cylinder will also accelerate and slide down under the action of the vibration wave, avoiding the problems of blocking the cylinder and the die.

[0027] Example 2: Combined with Figures 3 to 9As shown, on the basis of Embodiment 1, the barrel depth matching mechanism 100 further includes a bottom pad 110 arranged on the top of the detector body 300, a shaft rod 1102 installed in the bottom pad 110, a cross rail 1101 installed outside the bottom pad 110, a top pad 1103 movably installed outside the shaft rod 1102, a shaft head 1104 installed outside the top pad 1103, a traction frame 1105 movably installed on the shaft head 1104, a locking member 1106 movably installed at the bottom end of the traction frame 1105, and the locking member 1106 is movably installed in the cross rail 1101. Two jacket sleeves 130 are arranged on the top of the top pad 1103. Two first bolts 120 penetrate into the two jacket sleeves 130 and are connected to the inside of the top pad 1103. A mother pipe 150 is fixedly installed in the two jacket sleeves 130, and a sub-rod 1501 is movably installed in the mother pipe 150; The bottom end of the lead screw 140 is movably installed in the two jacket sleeves 130.

[0028] Preferably, the bottom pad 110 is fixed to the top of the detector body 300 by welding. Among them, the top end of the sub-rod 1501 is fixedly installed inside the support plate 160; When the lead screw 140 is rotated forward, the support plate 160 will rise along the threaded section of the lead screw 140, and the overall barrel internal vibrating mechanism 200 will be lifted upward at a constant speed until the barrel internal vibrating mechanism 200 completely withdraws from the inner cavities of the two discharge barrel covers 470. After the barrel internal vibrating mechanism 200 completely withdraws, the pusher rod required for subsequent detection can be placed in the barrel, and then the weights can be placed on the pusher rod; In order to increase the falling speed of the material in the barrel, by controlling the reverse rotation of the lead screw 140 until the uniformly distributed multiple resonance strip plates 240 continuously descend towards the inside of the barrel. During the descent of the resonance strip plates 240, the vibrating resonance strip plates 240 can prevent the material from accumulating and sticking.

[0029] Embodiment 3: Combined with Figures 7 to 9 As shown, on the basis of Embodiment 1, the die calibration mechanism 400 further includes two neck sleeves 480 arranged on the outer wall of the discharge barrel cover 470; The feeding mechanism 600 includes a feed bin 610 installed in one neck sleeve 480, a cover 620 arranged at the top end of the feed bin 610, a sieve plate 630 arranged inside the feed bin 610, an end plate 6101 arranged on the outer wall of the feed bin 610, a pin block 650 movably installed in the feed bin 610 and pressing on the top of the sieve plate 630, a third spring 660 connected between the pin block 650 and the end plate 6101, and a plug board 640 movably installed inside the feed bin 610 and located directly below the sieve plate 630.

[0030] Preferably, the storage bin 610 and the cover 620 are made of ceramic materials, and the sieve plate 630 is made of aluminum alloy material. A sieve mesh is provided inside the sieve plate 630 for filtering impurities and dust in the material. Among them, the top of the pin block 650 is provided with an inclined surface. In the initial state, the pin block 650 is pressed against the sieve plate 630 by the third spring 660. The material placed along the port of the storage bin 610 is sputtered towards the inclined surface of the sieve plate 630 under the guiding action of the inclined surface of the pin block 650. At this time, the impurities mixed in the material can be accelerated and removed.

[0031] Embodiment 4: Combined Figure 5 and Figure 7 As shown, on the basis of Embodiment 1, the pressurizing mechanism 500 includes an air chamber 510 provided in another neck sleeve 480 and a flow guide cover 520 provided at the top of the air chamber 510. An arc-shaped cavity 2102 is provided inside the conical head 2101. After the arc-shaped cavity 2102 communicates with the inner cavity of the air chamber 510, it is used to improve the efficiency of the material entering the barrel.

[0032] Preferably, a hose is provided at the top of the flow guide cover 520. According to the different mechanisms of sending air in and exhausting air out through the hose according to the pretreatment requirements of the barrel in the detector body 300, the heating rate before the pre-detection in the barrel can be accelerated, and at the same time, the cooling rate after the barrel test can also be accelerated accordingly.

[0033] The working principle and usage process of the present invention: Pretreatment is carried out before detecting the melt flow rate of polypropylene. Pre-adjust the reverse rotation of the second lead screw 430. At this time, the second lead screw 430 will advance along the inside of the stability-enhancing pad 420 towards the center of the barrel hole at the top of the detector body 300. The adapter 4301 movably installed at the inner end of the second lead screw 430 will push the cantilever 440 to turn sideways, and the cantilever 440 will turn downwards along the inner end of the pad 4105 until the discharge barrel cover 470 forms a vertical angle with the top of the detector body 300. Then, turn the other discharge barrel cover 470 sideways at the same angle in the above manner until the two discharge barrel covers 470 form a closed structure, and the bottom ends of the two closed discharge barrel covers 470 are symmetrical with the top of the barrel of the detector body 300. Then use the die cleaning rod to deliver the die down along the inner cavities of the two discharge barrel covers 470 until the die is placed in the barrel at the top of the detector body 300. Then loosen the nut inside the locking member 1106, and control the bottom end of the traction frame 1105 to move horizontally outward along the cross rail 1101. In the initial state, the inclined top pad 1103 will be pulled and form a closure with the top end of the bottom pad 110. At this time, the support plate 160 arranged outside the lead screw 140 will reverse the suspended in-cylinder vibrating mechanism 200 directly above the two discharge cylinder covers 470 until the evenly distributed multiple resonance strip plates 240 are symmetric with the center of the inner cavity of the two discharge cylinder covers 470; Then pull out the insertion plate 640 outward, and at the same time lift the pin block 650 upward until the materials in the upper half cavity of the bin 610 are screened by the sieve plate 630 and transferred to the lower half cavity. Then the materials will be transferred to the two discharge cylinder covers 470 along the bottom pipe of the bin 610, and finally the materials will enter the cylinder at the top of the detector body 300 along the die orifice; Then adjust the lead screw 140 to reverse, and the support plate 160 will drive the in-cylinder vibrating mechanism 200 to descend as a whole. Finally, the conical head 2101 will be adapted to the inclined surface at the bottom of the inner cavity of the two discharge cylinder covers 470, and the arc cavity 2102 will form a communication state with the bottom end of the air chamber 510, and the bottom ends of the two discharge cylinder covers 470 will also calibrate and press the die orifice; With the start of the motor 2105, the crankshaft 2106 will drive the pull rod 2301 to stretch reciprocally, and the bracket 230 will drive the boosting head 2302 to vibrate at a high frequency. At this time, the evenly distributed multiple resonance strip plates 240 will also be vibrated accordingly, and the materials put into the cylinder at the top of the detector body 300 can accelerate the descent under the action of vibration, thus avoiding the problem of blockage of the die orifice and the inner wall of the cylinder caused by the temperature rise in the cylinder.

[0034] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A melt flow rate instrument for polypropylene, comprising a detector body (300), characterized in that, It further includes two sets of die calibration mechanisms (400) arranged on the top of the detector body (300), a pressurizing mechanism (500) arranged on one set of die calibration mechanisms (400), a feeding mechanism (600) arranged on the other set of die calibration mechanisms (400), a barrel depth matching mechanism (100) arranged on the detector body (300), and a barrel internal vibrating mechanism (200) arranged on the barrel depth matching mechanism (100), and the barrel internal vibrating mechanism (200) is located directly above the two sets of die calibration mechanisms (400); The barrel depth matching mechanism (100) includes a lead screw (140) and a support plate (160) arranged outside the lead screw (140); The barrel internal vibrating mechanism (200) includes a shield (210) arranged at the other end of the support plate (160), a tapered head (2101) installed at the bottom of the shield (210), a plurality of resonance strip plates (240) movably installed inside the tapered head (2101), and an internal tension spring (250) connected between the tapered head (2101) and the resonance strip plates (240); A material barrel for placing the die is opened at the top end of the detector body (300), and after the plurality of resonance strip plates (240) extend into the material barrel, they are used to improve the falling efficiency of the material; The die calibration mechanism (400) includes a discharging cylinder cover (470) that is turned over and penetrates into the material barrel, and the number of the discharging cylinder covers (470) is two.

2. The melt flow rate instrument for polypropylene according to claim 1, characterized in that, The barrel depth matching mechanism (100) further includes a bottom pad (110) arranged on the top of the detector body (300), a shaft rod (1102) installed inside the bottom pad (110), a cross rail (1101) installed outside the bottom pad (110), a top pad (1103) movably installed outside the shaft rod (1102), a shaft head (1104) installed outside the top pad (1103), a traction frame (1105) movably installed on the shaft head (1104), a locking member (1106) movably installed at the bottom end of the traction frame (1105), and the locking member (1106) is movably installed inside the cross rail (1101), two clamping sleeves (130) arranged on the top of the top pad (1103), two first bolts (120) that penetrate into the two clamping sleeves (130) and are connected inside the top pad (1103), a main pipe (150) fixedly installed inside the two clamping sleeves (130), and a sub rod (1501) movably installed inside the main pipe (150); The bottom end of the lead screw (140) is movably installed inside the two clamping sleeves (130).

3. The melt flow rate instrument for polypropylene according to claim 1, characterized in that, The die calibration mechanism (400) further includes neck sleeves (480) arranged on the outer wall of the discharging cylinder cover (470), and the number of the neck sleeves (480) is two; The feeding mechanism (600) includes a silo (610) installed in a neck sleeve (480), a cover (620) provided at the top of the silo (610), a sieve plate (630) provided inside the silo (610), an end plate (6101) provided on the outer wall of the silo (610), a pin block (650) movably installed in the silo (610) and pressing on the top of the sieve plate (630), a third spring (660) connected between the pin block (650) and the end plate (6101), and a plug plate (640) movably installed inside the silo (610) and located directly below the sieve plate (630).

4. The melt flow rate instrument for polypropylene according to claim 1, characterized in that The pressurizing mechanism (500) includes an air chamber (510) installed in another neck sleeve (480) and a flow guide cover (520) provided at the top of the air chamber (510).

5. The melt flow rate instrument for polypropylene according to claim 1, characterized in that, The in-barrel vibrating mechanism (200) further includes an inner support column (2103) installed at the top of the conical head (2101), an anti-seepage rubber sleeve (220) provided inside the conical head (2101), a bracket (230) provided inside the anti-seepage rubber sleeve (220), a pull rod (2301) movably installed at the top of the bracket (230), a crankshaft (2106) movably installed inside the inner support column (2103), and the pull rod (2301) is movably installed on the crankshaft (2106), a pressurizing head (2302) fixedly installed at the bottom end of the bracket (230), a base (2104) fixedly installed on one side of the top of the conical head (2101), and a motor (2105) installed inside the base (2104), and the transmission shaft in the motor (2105) is installed on the crankshaft (2106).

6. The melt flow rate instrument for polypropylene according to claim 1, characterized in that, An arc-shaped cavity (2102) is formed inside the conical head (2101), and after the arc-shaped cavity (2102) communicates with the inner cavity of the air chamber (510), it is used to improve the efficiency of the material entering the barrel.

7. The melt flow rate instrument for polypropylene according to claim 1, characterized in that The die calibration mechanism (400) further includes a fixing block (410) provided on the detector body (300), a second bolt (4101) passing through the fixing block (410) and installed inside the detector body (300), a positioning rod (4102) installed on the top of the fixing block (410), two sliding plates (4103) installed on the top of the positioning rod (4102), a plug (4104) installed on the top of the two sliding plates (4103), a stability-enhancing cushioning member (420) movably installed inside the two sliding plates (4103), a cushion plate (4105) provided outside the two sliding plates (4103), a first spring (4106) installed between the cushion plate (4105) and the positioning rod (4102), and the first spring (4106) is located outside the two first springs (4106), a swivel joint (4301) movably installed at the inner end of the second lead screw (430), a cantilever (440) movably installed on the cushion plate (4105) and the swivel joint (4301), a drawer plate (460) movably installed outside the cantilever (440), and a second spring (450) provided between the cantilever (440) and the drawer plate (460).

8. A melt flow rate instrument for polypropylene according to claim 1, characterized in that, The exterior of the conical head (2101) is coated with a heat-insulating paint layer, and a pressure relief notch is provided on the inner wall of the shield (210).

9. The melt flow rate instrument for polypropylene according to claim 7, wherein A T-shaped vertical groove is provided on the inner wall of the sliding plate (4103), and the sliding plate (4103) is made of stainless steel. The stability-increasing cushioning member (420) is composed of two L-shaped legs and an outer cushion, and the L-shaped legs are movably installed in the T-shaped vertical groove.

10. The melt flow rate instrument for polypropylene according to claim 7, characterized in that, A funnel-shaped hole is provided at the bottom end of the discharge cylinder cover (470), and the diameter width of the bottom end opening of the two discharge cylinder covers (470) after closing is the same as the diameter width of the die orifice.

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