Preparation equipment and method of high-strength MPP pipe

Abstract

The application discloses a kind of preparation equipment of high-strength MPP pipe and its preparation method, belong to pipe preparation equipment technical field, including bottom plate, vacuum box is equipped on bottom plate, vacuum pump is equipped on the side of vacuum box, vacuum detector is equipped on the side of vacuum pump, a plurality of heaters are equipped on the other side of vacuum box, the top of each heater is matched with a temperature detector, a control assembly is equipped below heater, second spraying mechanism is equipped on the inner top of vacuum box, first baffle door is detachably connected at the inlet of vacuum box, first spraying mechanism is equipped on first baffle door, second baffle door is equipped on the side of vacuum box away from inlet.The first spraying mechanism of the application can spray the inner wall of the pipe, the outer wall of the pipe can be sprayed by the second spraying mechanism, so the inner and outer of the pipe can be sprayed, and the efficiency of pipe cooling and shaping can be effectively improved.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe manufacturing equipment, specifically relating to a manufacturing equipment and method for high-strength MPP pipes. Background Technology

[0002] MPP pipe, also known as MPP power cable protection pipe, is divided into open-cut and trenchless types. Trenchless MPP pipe is also called MPP jacking pipe or drag pipe. MPP pipe uses modified polypropylene as the main raw material. It features high temperature resistance, external pressure resistance, and high strength, and is suitable for medium and low voltage power transmission cable ducts below 10KV.

[0003] During the manufacturing process of MPP pipes, the extruded pipes are typically sent to a spray vacuum chamber for cooling and shaping. However, current methods for cooling and shaping pipes generally involve spraying a liquid into fine particles inside the vacuum chamber. These particles are then propelled by a vacuum pump from the spray nozzle and rapidly absorb heat, achieving quick cooling and drying. However, this method only sprays the surface of the pipe, leaving the inner wall untreated, resulting in slow shaping efficiency. Furthermore, because the spray vacuum chamber is relatively long, inconsistent temperature ranges can easily occur within it. This leads to varying cooling and shaping effects in different areas of the pipe due to temperature differences, ultimately affecting the final shaping quality. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength MPP tube manufacturing apparatus and method to solve the problems encountered in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A high-strength MPP tube manufacturing apparatus includes a base plate, a vacuum chamber on the base plate, a vacuum pump on one side of the vacuum chamber, a vacuum detector on one side of the vacuum pump, multiple heaters on the other side of the vacuum chamber, a temperature detector above each heater, a control assembly below each heater, and a second spray mechanism on the inner top of the vacuum chamber.

[0007] The vacuum chamber has a first baffle detachably connected to its inlet, and a first spray mechanism is provided on the first baffle. The vacuum chamber has a second baffle on the side away from the inlet, and the second baffle is detachably connected to the first spray mechanism.

[0008] Furthermore, a rotating shaft is provided at the center of the first barrier, a first drive motor is provided at one end of the rotating shaft, and the other end of the rotating shaft is connected to the first spray mechanism. Handles are provided on both sides of the first drive motor, and four locking pins are arranged in a circular array on the inner side of the first barrier.

[0009] Furthermore, the first spraying mechanism includes a mounting shaft connected to a rotating shaft and a first gear. The first gear is connected to a first stop via a reinforcing rib, and the mounting shaft passes through the first gear. A spray box is provided on the mounting shaft. A first mounting groove and a second mounting groove are respectively provided on the upper and lower sides of the spray box. A lead screw is provided in both the first and second mounting grooves. A sliding plate that is slidably connected to the mounting groove is fitted on the lead screw. A first nozzle is provided on the sliding plate. The first nozzle is connected to the spray box. One end of the lead screw extends outward and is connected to a second gear. The second gear meshes with the first gear.

[0010] Furthermore, the thread direction on the lead screw in the first mounting groove is opposite to the thread direction on the lead screw in the second mounting groove.

[0011] Furthermore, a turntable is provided on the inner wall of the second gate, and a slot is provided at the center of the turntable. The slot is engaged with the other end of the mounting shaft. Four fixing slots are arranged in a ring on the turntable. Each fixing slot is provided with an electric control cylinder. A sliding block is provided on the output end of the electric control cylinder. The sliding block is slidably connected to the fixing slot, and an arc-shaped fixing plate is installed on the sliding block. A rubber pad is provided on the arc-shaped fixing plate.

[0012] Furthermore, the second spray mechanism includes a slide groove installed at the top of the vacuum chamber, a threaded rod provided in the slide groove, a second drive motor for driving is provided at one end of the threaded rod, a slider that is slidably connected to the slide groove is fitted on the threaded rod, a second nozzle is provided on the slider, and the second nozzle is connected to an external spray box.

[0013] Furthermore, the bottom of the vacuum chamber is provided with several support mechanisms at equal intervals. Each support mechanism includes a support frame, the top of which is provided with an arc-shaped support groove, and the inner wall of the arc-shaped support groove is provided with several rollers.

[0014] A method for preparing a high-strength MPP tube, comprising the aforementioned equipment for preparing a high-strength MPP tube, wherein the preparation method includes:

[0015] Step 1: The extruded pipe and the first spraying mechanism are successively fed into the vacuum chamber, and the first and second gates are sealed.

[0016] Step 2: Control the operation of the vacuum pump and heater to adjust the vacuum level and temperature inside the vacuum chamber to a suitable level and temperature.

[0017] Step 3: Drive the first drive motor to work, which drives the first nozzle to rotate on the inner wall of the pipe and move towards the pipe, thereby spraying the inside of the pipe evenly.

[0018] Step 4: Close the first nozzle, drive the first electric cylinder to extend and retract, fix the pipe with four arc-shaped fixing plates, so that the pipe and the installation shaft rotate together. At the same time, start the second drive motor to drive the second nozzle to move back and forth, and spray the outer wall of the rotating pipe evenly.

[0019] Step 5: While spraying, the temperature and vacuum level inside the vacuum chamber are monitored by temperature and vacuum detectors to ensure that the temperature and vacuum level are always at a level that is conducive to the cooling and shaping of the pipe.

[0020] Furthermore, the method for monitoring temperature and vacuum level in step five is as follows:

[0021] Based on the installation location of the temperature detector, the vacuum chamber is divided into n equally spaced regions. At regular intervals, the temperature is measured using the formula... Calculate the temperature deviation value of the i-th region. Where t1 is the start time, t2 is the end time, and T... i (t) is the fitted curve of the historical temperature change over time in the i-th region, and w1 and w2 are the scaling coefficients;

[0022] The obtained temperature deviation value With threshold interval [T] thX T thY Comparison:

[0023] When the temperature deviation value is not within the threshold range, the corresponding heater is controlled and adjusted by the control assembly:

[0024] like Then through the formula Lower the temperature (T) - The number of degrees, & is the conversion coefficient;

[0025] like Then through the formula Increase the temperature by T + Number of degrees.

[0026] The beneficial effects of this invention are:

[0027] The present invention can spray the inner wall of the pipe through a first spray mechanism and spray the outer wall of the pipe through a second spray mechanism, so that the inner and outer sides of the pipe can be sprayed, which can effectively improve the efficiency of pipe cooling and shaping.

[0028] The present invention utilizes the meshing of the second gear and the first gear to drive the first nozzle to move along the pipe direction on the inner wall of the pipe when the first nozzle rotates in a circular motion, thereby spraying various parts of the pipe interior to accelerate the pipe shaping speed.

[0029] The invention uses multiple temperature detectors to divide the long area inside the vacuum chamber into multiple short areas and detects the temperature in each short area. This allows for the determination of the temperature change of each area relative to the overall temperature inside the vacuum chamber, and corresponding adjustments can be made to ensure that the temperature of each area can be restored to uniformity in a timely manner, thus facilitating the shaping of the pipe.

[0030] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a schematic diagram of another structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the internal structure of the vacuum chamber of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the first gate of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the first sprayer of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of the second gate of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the second spraying mechanism of the present invention;

[0039] Figure 8 This is a schematic diagram of the support mechanism of the present invention.

[0040] Figure caption:

[0041] 1. Base plate; 2. Vacuum chamber; 3. Vacuum pump; 4. Vacuum detector; 5. Heater; 6. Temperature detector; 7. Control assembly; 8. First gate; 9. Second gate; 10. First spray mechanism; 11. Second spray mechanism; 12. Support mechanism; 801. Rotating shaft; 802. First drive motor; 803. Handle; 804. Locking pin; 101. Mounting shaft; 102. First gear; 103. Spray box; 104. First mounting slot; 105. 2. Mounting slot; 106. Lead screw; 107. Slide plate; 108. First nozzle; 109. Second gear; 901. Turntable; 902. Slot; 903. Fixing slot; 904. Electric cylinder; 905. Sliding block; 906. Arc-shaped fixing plate; 907. Rubber pad; 201. Slide groove; 202. Threaded rod; 203. Slider; 204. Second nozzle; 205. Second drive motor; 301. Support frame; 302. Arc-shaped support groove; 303. Roller. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Equipment for manufacturing high-strength MPP pipes, such as Figures 1-3 As shown, the vacuum chamber includes a base plate 1, a vacuum chamber 2 on the base plate 1, a vacuum pump 3 on one side of the vacuum chamber 2, a vacuum detector 4 on one side of the vacuum pump 3, a heater 5 on the other side of the vacuum chamber 2, several temperature detectors 6 equidistantly arranged above the heater 5, a control assembly 7 below the heater 5, a second spray mechanism 11 on the inner top of the vacuum chamber 2, a first baffle 8 detachably connected to the inlet of the vacuum chamber 2, a first spray mechanism 10 on the first baffle 8, a second baffle 9 on the side of the vacuum chamber 2 away from the inlet, and the second baffle 9 is detachably connected to the first spray mechanism 10. The control assembly 7 controls all electrical components on the preparation equipment, facilitating operation. The vacuum pump 3 maintains a certain vacuum in the vacuum chamber 2 and detects the vacuum level through the vacuum detector 4, ensuring that the vacuum chamber 2 maintains a constant vacuum level, which is beneficial for cooling and shaping the pipe. The first spray mechanism 10 sprays the pipe from the inner wall, while the second spray mechanism 11 sprays the pipe from the outer wall, accelerating the cooling and shaping of the pipe. The heater 5 maintains a certain temperature inside the vacuum chamber 2, which is detected by the temperature detector 6, thus quickly drying and cooling the pipe.

[0044] like Figure 4 As shown, a rotating shaft 801 is provided at the center of the first gate 8. One end of the rotating shaft 801 is provided with a first drive motor 802, and the other end of the rotating shaft 801 is connected to the first spray mechanism 10. Handles 803 are provided on both sides of the first drive motor 802. Four locking pins 804 are also arranged in a circular array on the inner side of the first gate 8. The locking pins 804 are installed and fixed by cooperating with the locking holes on the vacuum box 2. The first gate 8 and the vacuum box 2 are detachably connected. When detached, it is used for feeding. When installed, the first spray mechanism 10 can be sent into the vacuum box 2, and the vacuum box 2 can also be sealed to ensure that the cooling and shaping of the pipe can proceed normally.

[0045] like Figure 4 , Figure 5 As shown, the first spraying mechanism 10 includes a mounting shaft 101 connected to a rotating shaft 801 and a first gear 102. The first gear 102 is connected to a first stop 8 via a reinforcing rib, and the mounting shaft 101 passes through the first gear 102. A spray box 103 is provided on the mounting shaft 101. A first mounting groove 104 and a second mounting groove 105 are respectively provided on the upper and lower sides of the spray box 103. A lead screw 106 is provided in both the first mounting groove 104 and the second mounting groove 105. A sliding plate 107 is fitted on the lead screw 106 and slidably connected to the mounting groove. A first nozzle 108 is provided on the sliding plate 107. The first nozzle 108 is connected to the spray box 103. One end of the lead screw 106 extends outward and is connected to a second gear 109. The second gear 109 meshes with the first gear 102. After the first spray mechanism 10 is fed into the vacuum chamber 2, it is inserted into the middle of the pipe. Then, the first drive motor 802 drives the mounting shaft 101 to rotate, thereby causing the spray chamber 103 to rotate as well. Simultaneously, due to the meshing of the second gear 109 and the first gear 102, the lead screw 106 rotates. When the lead screw 106 rotates, it causes the sliding plate 107 to slide within its respective mounting slot. This allows the first nozzle 108 to move along the pipe direction. During this movement... The mounting groove rotates, allowing the first nozzle 108 to move forward in a rotating manner along the inner wall of the pipe, thereby spraying the inside of the pipe and accelerating the shaping speed. The thread direction on the lead screw 106 in the first mounting groove 104 is opposite to the thread direction on the lead screw 106 in the second mounting groove 105, so that the initial positions of the two first nozzles 108 can be placed at both ends of the pipe to be shaped. When the first drive motor 802 rotates, the two first nozzles 108 move towards the center simultaneously, which can accelerate the spraying speed.

[0046] like Figures 6-8As shown, a turntable 901 is provided on the inner wall of the second gate 9. A slot 902 is provided at the center of the turntable 901. The slot 902 is engaged with the other end of the mounting shaft 101. Four fixing slots 903 are arranged in a ring on the turntable 901. An electric cylinder 904 is provided in each fixing slot 903. A sliding block 905 is provided on the output end of the electric cylinder 904. The sliding block 905 is slidably connected to the fixing slot 903. An arc-shaped fixing plate 906 is installed on the sliding block 905. A rubber pad 907 is provided on the arc-shaped fixing plate 906. The arc-shaped fixing plate 906 can fix the pipe. The adjustment is made according to the different diameters of the pipe by extending and retracting the electric cylinder 904. The rubber pad 907 is provided to fit the arc-shaped fixing plate 906 with the inner wall of the pipe with different diameters. The second spraying mechanism 11 includes a slide groove 201 installed at the top of the vacuum chamber 2. A threaded rod 202 is provided within the slide groove 201. One end of the threaded rod 202 is equipped with a second drive motor 205 for driving. A slider 203, slidably connected to the slide groove 201, is fitted onto the threaded rod 202. A second nozzle 204 is provided on the slider 203 and is connected to an external spray box. The second drive motor 205 drives the threaded rod 202 to rotate, thereby causing the second nozzle 204 on the slider 203 to move back and forth, spraying the outer wall of the pipe. The slot 902 is connected to the other end of the mounting shaft 101, so that when the mounting shaft 101 rotates, it will move the turntable 901 together. When spraying the outer wall of the pipe, the electric control cylinder 904 extends and retracts, adjusting the position of the four arc-shaped fixing plates 906 according to the inner diameter of the pipe to fix the pipe. When the mounting shaft 101 rotates, it will drive the pipe to rotate together, and then the second drive motor 205 will rotate, driving the second spray head 204 to move back and forth, which can spray the outer wall of the rotating pipe to ensure uniform spraying and thus ensure the quality of pipe shaping. The bottom of the vacuum box 2 is also provided with several support mechanisms 12 at equal intervals. The support mechanism 12 includes a support frame 301. The top of the support frame 301 is provided with an arc-shaped support groove 302. Several rollers 303 are provided on the inner wall of the arc-shaped support groove 302. The arc-shaped support groove 302 on the support mechanism 12 supports the pipe to be shaped, while the roller 303 reduces resistance and makes it easier for the pipe to rotate when the mounting shaft 101 drives the pipe to rotate.

[0047] In use, the extruded tube is fed into the arc-shaped support groove 302 inside the vacuum chamber 2. Then, the first spray mechanism 10 is fed into the vacuum chamber 2, and the first baffle 8 and the second baffle 9 are closed. The mounting shaft 101 is then engaged with the slot 902. The vacuum pump 3 is then controlled to bring the vacuum chamber 2 to a certain vacuum level, while the heater 5 brings the vacuum chamber 2 to a certain temperature. The first drive motor 802 is then started, causing the spray box 103 to rotate. Under the meshing of the first gear 102 and the second gear 109, the lead screw 106 rotates as well. When the lead screw 106 rotates, it causes the slide plate 107 to slide in its respective mounting groove. This allows the first nozzle 108 to move along the direction of the tube. Since the mounting groove rotates during the movement, the first nozzle 108 can move within the tube. While the wall rotates, it moves forward, spraying the interior of the pipe. After the inner wall is sprayed, the first nozzle 108 is closed. At this time, the first electrically controlled cylinder 904 is driven to extend and retract, attaching the four arc-shaped fixing plates 906 to the inner wall of the pipe to fix it. When the mounting shaft 101 rotates, it drives the pipe to rotate as well. At the same time, the second drive motor 205 drives the second nozzle 204 to move back and forth, spraying the rotating pipe evenly on its outer surface. During spraying, the temperature and vacuum level inside the vacuum chamber 2 are monitored by the temperature detector 6 and the vacuum detector 4. When an abnormality occurs, it is transmitted to the control assembly 7 to adjust the vacuum pump 3 and the heater 5, adjusting the temperature and vacuum level inside the vacuum chamber 2 to keep them at a level conducive to the cooling and shaping of the pipe. The method for monitoring the temperature and vacuum level is as follows:

[0048] Based on the installation location of temperature detector 6, the vacuum chamber 2 is divided into n equally spaced regions. At regular intervals, the temperature is measured using the formula... Calculate the temperature deviation value of the i-th region. Where t1 is the start time, t2 is the end time, and T... i (t) is the fitted curve of the historical temperature change over time in the i-th region, and w1 and w2 are the scaling coefficients;

[0049] The obtained temperature deviation value With threshold interval [T] thX T thY Comparison:

[0050] When the temperature deviation value is not within the threshold range, the corresponding heater 5 is controlled and adjusted through the control assembly 7:

[0051] like If the temperature deviation is too high, the temperature in that area is higher than the overall temperature inside vacuum chamber 2, and the temperature in that area needs to be lowered. This can be achieved using the formula... Lower the temperature (T) - The number of degrees, & is the conversion coefficient;

[0052] like If the temperature deviation value is too low, the temperature in this area is considered to be lower than the overall temperature inside vacuum chamber 2, and the temperature in this area needs to be increased. This can be achieved using the formula... Increase the temperature by T + Number of degrees.

[0053] This operation allows us to determine the temperature changes in each area relative to the overall temperature within vacuum chamber 2, and to make corresponding adjustments to ensure that the temperatures in each area return to uniformity in a timely manner, thus guaranteeing temperature balance and facilitating the shaping of the pipe. Specifically, we first use... The temperature changes in a single area and the overall temperature changes within vacuum chamber 2 over a historical period were obtained, and then based on... The temperature changes in a single area and the overall temperature changes within vacuum chamber 2 over a real-time time period are obtained. Finally, the results are calculated using the formula... The temperature deviation values ​​of various areas within vacuum chamber 2 are analyzed to determine if the temperature deviation value is outside the threshold range. If the temperature deviation value is outside the threshold range, it indicates that the temperature needs to be adjusted. If the temperature deviation is too high, the temperature in that area is higher than the overall temperature inside vacuum chamber 2, and the temperature in that area needs to be lowered. This can be achieved using the formula... Lower the temperature (T) - The number of degrees, & is the conversion coefficient; if If the temperature deviation value is too low, the temperature in this area is considered to be lower than the overall temperature inside vacuum chamber 2, and the temperature in this area needs to be increased. This can be achieved using the formula... Increase the temperature by T + The temperature can be adjusted precisely and promptly based on the measured deviation to ensure consistent temperature within the vacuum chamber 2 and guarantee the quality of pipe cooling and shaping. The historical temperature variation over time fitting curve T... i (t), threshold interval [T] thX T thY All of these can be fitted based on historical data. The proportional coefficients w1 and w2, as well as the conversion coefficient, can all be determined after comprehensive analysis of historical data and relevant data in big data. They will not be described in detail here.

[0054] In summary, a method for preparing a high-strength MPP pipe mainly includes the following steps:

[0055] Step 1: The extruded pipe and the first spraying mechanism 10 are successively fed into the vacuum chamber 2, and the first gate 8 and the second gate 9 are sealed.

[0056] Step 2: Control the operation of vacuum pump 3 and heater 5 to adjust the vacuum level and temperature in vacuum chamber 2 to a suitable level and temperature.

[0057] Step 3: Drive the first drive motor 802 to work, which drives the first nozzle 108 to rotate on the inner wall of the pipe and move towards the pipe, thereby spraying the inside of the pipe evenly.

[0058] Step 4: Close the first nozzle 108, drive the first electric cylinder 904 to extend and retract, fix the pipe with four arc-shaped fixing plates 906, so that the pipe and the mounting shaft 101 rotate together, and at the same time start the second drive motor 205 to drive the second nozzle 204 to move back and forth, and spray the outer wall of the rotating pipe evenly.

[0059] Step 5: While spraying, the temperature and vacuum level inside the vacuum chamber 2 are monitored by temperature detector 6 and vacuum detector 4 to ensure that the temperature and vacuum level are always at a level that is conducive to the cooling and shaping of the pipe.

[0060] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A preparation equipment of high-strength MPP pipe, comprising a base plate (1), characterized in that, A vacuum chamber (2) is provided on the base plate (1). A vacuum pump (3) is provided on one side of the vacuum chamber (2). A vacuum detector (4) is provided on one side of the vacuum pump (3). A plurality of heaters (5) are provided on the other side of the vacuum chamber (2). A temperature detector (6) is provided above each heater (5). A control assembly (7) is provided below each heater (5). A second spray mechanism (11) is provided on the inner top of the vacuum chamber (2). The second spray mechanism (11) includes a second nozzle (204). The vacuum chamber (2) is detachably connected to a first baffle (8) at its inlet. A first spray mechanism (10) is provided on the first baffle (8). A second baffle (9) is provided on the side of the vacuum chamber (2) away from the inlet. The second baffle (9) is detachably connected to the first spray mechanism (10). A rotating shaft (801) is provided at the center of the first baffle (8). A first drive motor (802) is provided at one end of the rotating shaft (801). The other end of the rotating shaft (801) is connected to the first spray mechanism (10). Handles (803) are provided on both sides of the first drive motor (802). Four locking pins (804) are also arranged in a circular array on the inner side of the first baffle (8). The first spraying mechanism (10) includes a mounting shaft (101) connected to a rotating shaft (801) and a first gear (102). The first gear (102) is connected to a first stop (8) via a reinforcing rib, and the mounting shaft (101) passes through the first gear (102). A spray box (103) is provided on the mounting shaft (101). A first mounting groove (104) and a second mounting groove (105) are respectively provided on the upper and lower sides of the spray box (103). A lead screw is provided in both the first mounting groove (104) and the second mounting groove (105). (106), the lead screw (106) is fitted with a sliding plate (107) that is slidably connected to the mounting groove. The sliding plate (107) is provided with a first nozzle (108). The first nozzle (108) is connected to the spray box (103). One end of the lead screw (106) extends outward and is connected to a second gear (109). The second gear (109) meshes with the first gear (102). The thread direction on the lead screw (106) in the first mounting groove (104) is opposite to the thread direction on the lead screw (106) in the second mounting groove (105). The inner wall of the second gate (9) is provided with a turntable (901), and a slot (902) is provided at the center of the turntable (901). The slot (902) is engaged with the other end of the mounting shaft (101). The turntable (901) has four fixed slots (903) arranged in a ring. Each fixed slot (903) is provided with an electric cylinder (904). The output end of the electric cylinder (904) is provided with a sliding block (905). The sliding block (905) is slidably connected to the fixed slot (903). An arc-shaped fixing plate (906) is installed on the sliding block (905). A rubber pad (907) is provided on the arc-shaped fixing plate (906). The first nozzle (108) moves forward while rotating on the inner wall of the pipe, thereby spraying the inside of the pipe. After the inner wall is sprayed, the first nozzle (108) is closed. At this time, the electric control cylinder (904) is driven to extend and retract, and the four arc-shaped fixing plates (906) are attached to the inner wall of the pipe to fix the pipe. When the mounting shaft (101) rotates, it drives the pipe to rotate together. At the same time, the second nozzle (204) sprays the outer surface of the rotating pipe.

2. The preparation equipment of high-strength MPP pipe according to claim 1, characterized in that, The second spray mechanism (11) includes a slide groove (201) installed at the top of the vacuum box (2). A threaded rod (202) is provided in the slide groove (201). One end of the threaded rod (202) is provided with a second drive motor (205) for driving. A slider (203) is fitted on the threaded rod (202) and slidably connected to the slide groove (201). A second nozzle (204) is provided on the slider (203). The second nozzle (204) is connected to an external spray box.

3. The preparation equipment of high-strength MPP pipe according to claim 2, characterized in that, The vacuum chamber (2) is also provided with several support mechanisms (12) at equal intervals at the bottom. The support mechanism (12) includes a support frame (301). The top of the support frame (301) is provided with an arc-shaped support groove (302). The inner wall of the arc-shaped support groove (302) is provided with several rollers (303).

4. A method for preparing a high-strength MPP pipe, comprising the apparatus for preparing a high-strength MPP pipe as described in any one of claims 1-3, characterized in that, The preparation method includes: Step 1: The extruded pipe and the first spraying mechanism (10) are successively fed into the vacuum chamber (2), and the first gate (8) and the second gate (9) are closed. Step 2: Control the operation of the vacuum pump (3) and heater (5) to adjust the vacuum level and temperature in the vacuum chamber (2) to a suitable vacuum level and temperature; Step 3: Drive the first drive motor (802) to work, and drive the first nozzle (108) to rotate on the inner wall of the pipe and move towards the pipe, so as to spray the inside of the pipe evenly. Step 4: Close the first nozzle (108), drive the electric control cylinder (904) to extend and retract, fix the pipe with four arc-shaped fixing plates (906), so that the pipe and the mounting shaft (101) rotate together, and at the same time start the second drive motor (205) to drive the second nozzle (204) to move back and forth, and spray the outer wall of the rotating pipe evenly. Step 5: While spraying, the temperature and vacuum level inside the vacuum chamber (2) are monitored by temperature detector (6) and vacuum detector (4) to keep the temperature and vacuum level at a level that is conducive to the cooling and shaping of the pipe.

5. The method for preparing a high-strength MPP pipe according to claim 4, characterized in that, The method for monitoring temperature and vacuum level in step five is as follows: Based on the installation location of the temperature detector (6), the vacuum chamber (2) is divided into n equally spaced regions. At regular intervals, the temperature is measured using the formula... + Calculate the temperature deviation value of the i-th region. ,in For the start time, End time, This is a fitted curve of the historical temperature change over time for the i-th region. as well as This is the proportionality coefficient; The obtained temperature deviation value With threshold range Comparison: When the temperature deviation value is not within the threshold range, the corresponding heater (5) is controlled and adjusted by the control assembly (7): like ∈ Then through the formula = ( - Lower the temperature. The number of degrees, & is the conversion coefficient; like ∈ Then through the formula = ( - Increase the temperature. Number of degrees.

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