Vacuum box for pipe production

Abstract

According to the technical scheme, the vacuum box for pipe production comprises a vacuum box body and a water level control device, and the vacuum box body is connected with a vacuum pump and used for vacuumizing from the top of the vacuum box body; the water level control device comprises a vacuum isolation tank, a communicating assembly and a liquid level feedback assembly, the liquid level feedback assembly is installed in the vacuum box and used for monitoring the liquid level height, and the vacuum isolation tank is arranged at the bottom of the vacuum box and communicates with the interior of the vacuum box through the communicating assembly; and the communicating assembly is used for opening or closing a passage between the vacuum box and the vacuum isolation tank. The vacuum pump is arranged at the top of the vacuum box for suction, water suction is avoided, meanwhile, under the arrangement of the water level control device, when the liquid level is too high, water is drained into the vacuum isolation tank through the vacuum isolation tank, the communication assembly and the liquid level feedback assembly, and the situation that the spraying head at the bottommost portion is submerged is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipe production equipment technical field especially relates to a pipe production is with vacuum box. BACKGROUND

[0002] The vacuum box with the spray system plays a very important role in the pipe production process, especially in improving the cooling efficiency and product quality. The spray system can significantly accelerate the cooling speed of the plastic pipe through uniform water cooling treatment of the pipe, thereby shortening the molding cycle and improving the production efficiency.

[0003] For example, Chinese patent 201720415900.1 discloses a PVC extrusion line cooling vacuum box water spraying device, which comprises a box body and a water tank, a cover is arranged on the upper plate surface of the box body, water pipes are arranged at the corners formed by the upper and lower plate surfaces and the side wall of the box body, and spray heads are arranged on the water pipes.

[0004] For the above prior art, the existing vacuum box for pipe production, through the vacuum pump simultaneously sucking water and air in the box, will cause the negative pressure in the vacuum box to be unstable and fluctuate, at the same time, due to the interval of the spray head and the surrounding in the vacuum box, the bottom spray head is also submerged by the accumulated water, which will cause the uneven water cooling effect of the pipe. SUMMARY

[0005] Therefore, it is necessary to provide a vacuum box for pipe production to solve the technical problems of unstable negative pressure caused by the vacuum pump simultaneously sucking water and air, and the bottom spray head being submerged by the accumulated water.

[0006] To achieve the above technical purpose, the technical scheme of the utility model provides a vacuum box for pipe production, comprising:

[0007] a vacuum box connected with a vacuum pump, the suction end of the vacuum pump is installed at the top of the vacuum box, for vacuumizing from the top of the vacuum box; and

[0008] a water level control device, which comprises a vacuum isolation tank, a communication assembly and a liquid level feedback assembly, the liquid level feedback assembly is installed inside the vacuum box for monitoring the liquid level height, the vacuum isolation tank is arranged at the bottom of the vacuum box and communicates with the inside of the vacuum box through the communication assembly, the communication assembly is used to open or close the passage between the vacuum box and the vacuum isolation tank.

[0009] Further, the vacuum isolation tank comprises a tank body and a vacuum suction pump, the tank body is parallel to the length direction of the vacuum box and is fixedly connected therewith, and the vacuum suction pump is arranged above the side of the tank body to suck the vacuum in the tank body.

[0010] Further, the communication assembly comprises a communication pipe and a communication opening and closing mechanism, two ends of the communication pipe are connected with and communicate with the vacuum isolation tank and the vacuum box respectively, and the communication opening and closing mechanism is arranged on the communication pipe and used for controlling opening and closing of the communication pipe.

[0011] Further, the communication opening and closing mechanism comprises an electric control valve, and the electric control valve is mounted on the communication pipe.

[0012] Further, the number of the communication pipes is at least two.

[0013] Further, the communication opening and closing mechanism comprises a sealing cover and a hydraulic push rod, the sealing cover is correspondingly covered on the top end of the communication pipe, the hydraulic push rod is mounted on the inner side of the vacuum box, the extension end of the hydraulic push rod is connected with each sealing cover through a support, and the sealing cover is driven to be lifted and opened to the communication pipe or to be pressed and closed to the communication pipe.

[0014] Further, the tank body is provided with a liquid discharge valve.

[0015] Further, an openable pipeline is arranged on the upper side of the tank body and used for communicating with the atmosphere.

[0016] Further, the liquid level feedback assembly comprises a liquid level sensor, and the liquid level sensor is mounted in the vacuum box and on the inner side of the vacuum isolation tank.

[0017] Further, a controller is further arranged, and the liquid level sensor, the vacuum suction pump, the communication assembly, the liquid discharge valve and the pipeline are electrically connected with the controller.

[0018] Compared with the prior art, the vacuum pump is arranged on the top of the vacuum box, so that the water is avoided from being sucked, and under the arrangement of the water level control device, the water is discharged to the vacuum isolation tank when the liquid level is too high, the bottommost spray head is avoided from being submerged, and the negative pressure in the vacuum box can be maintained low and fluctuated during the water discharge process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a three-dimensional structure diagram of the vacuum box for pipe production according to the embodiment of the utility model;

[0020] Figure 2 is a front view schematic diagram of the vacuum box for pipe production according to the embodiment of the utility model, and an electric control valve is adopted;

[0021] Figure 3 is a front view schematic diagram of the vacuum box for pipe production according to the embodiment of the utility model, and a sealing cover is adopted;

[0022] Figure 4 This is a control block diagram of a vacuum box for pipe production according to an embodiment of the present utility model;

[0023] In the diagram: 1. Vacuum chamber; 101. Vacuum pump; 2. Water level control device; 21. Vacuum isolation tank; 211. Tank body; 212. Vacuum suction pump; 213. Drain valve; 214. Pipeline; 22. Connecting component; 221. Connecting pipe; 222. On / off mechanism; 2221. Electrically controlled valve; 2222. Sealing cover; 2223. Hydraulic push rod; 23. Liquid level feedback component; 2301. Liquid level sensor; 3. Controller. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0025] like Figures 1-4 As shown, this utility model provides a vacuum chamber for pipe production, including a vacuum chamber 1 and a water level control device 2. Spray heads are evenly spaced around the inside of the vacuum chamber 1, and a vacuum pump 101 is connected to it. The suction end of the vacuum pump 101 is installed at the top of the vacuum chamber 1, and the suction end of the vacuum pump 101 passes through a pipe to the inner top wall of the vacuum chamber 1, connecting the inside of the vacuum chamber 1, for drawing a vacuum from the top of the vacuum chamber 1, thereby avoiding the suction of air and water together during vacuuming and improving the stability of the negative pressure. The water level control device 2 includes a vacuum isolation tank 21, a connecting component 22, and a liquid level feedback component 23. The liquid level feedback component 23 is installed inside the vacuum chamber 1 for monitoring the liquid level height to provide early warning. The water level submerges the bottom spray head. The vacuum isolation tank 21 is located at the bottom of the vacuum box 1 and is connected to the interior of the vacuum box 1 through the connecting component 22. The connecting component 22 is used to open or close the passage between the vacuum box 1 and the vacuum isolation tank 21. During use, the vacuum isolation tank 21 is in a vacuum state, so that the negative pressure inside it is relatively balanced with the negative pressure of the vacuum box 1, avoiding the impact of air pressure imbalance on drainage. When the connecting component 22 opens the connection between the vacuum isolation tank 21 and the vacuum box 1, the water in the vacuum box 1 can be drained underwater into the vacuum isolation tank 21, thereby preventing the water in the vacuum box 1 from submerging the bottom spray head and maintaining the uniformity of spray cooling.

[0026] It should be noted that the vacuum degree of the vacuum isolation tank 21 can be adjusted to be slightly higher than that of the vacuum box 1, that is, to have a pressure difference that promotes water to enter the vacuum isolation tank 21, and to make the drainage between the vacuum box 1 and the vacuum isolation tank 21 smoother by using the pressure difference.

[0027] Furthermore, in order to evacuate the vacuum isolation tank 21, the vacuum isolation tank 21 includes a tank body 211 and a vacuum pump 212. The tank body 211 is parallel to the length direction of the vacuum chamber 1 and is fixedly connected to it, so that it has sufficient volume. The vacuum pump 212 is located on the upper side of the tank body 211 to evacuate the inside of the tank body 211. The vacuum pump 212 can be used to evacuate the inside of the tank body 211, and the vacuum state can be restored repeatedly after the liquid is drained.

[0028] Furthermore, the tank body 211 is provided with a drain valve 213. When the drain valve 213 on the tank body 211 is opened, the connecting component 22 is in a closed state. Conversely, when the connecting component 22 is in an open state, the drain valve 213 is closed.

[0029] Understandably, if it is necessary to drain the vacuum chamber 1, the prerequisite is that the tank 211 is evacuated by the vacuum isolation tank 21, and then the connecting component 22 is opened to drain the water from the vacuum chamber 1 into the tank 211. If it is necessary to drain the tank 211, the prerequisite is that the connecting component 22 is closed, thereby blocking the connection between the vacuum chamber 1 and the vacuum isolation tank 21 to prevent the drained liquid from communicating with the atmosphere and causing negative pressure fluctuations in the vacuum chamber 1. Then the drain valve 213 is opened to drain the water.

[0030] Furthermore, in order to improve the drainage rate and smoothness when the tank 211 is draining water, an openable pipe 214 is provided on the upper side of the tank 211 to connect to the atmosphere. When the drain valve 213 is opened to drain water from the tank 211, the pipe 214 is opened simultaneously to connect the tank 211 to the atmosphere, so as to assist drainage with atmospheric pressure.

[0031] Understandably, after draining the water, it is necessary to close pipe 214 and drain valve 213, and re-vacuum tank 211 in preparation for the next use.

[0032] In addition, to increase the pumping speed, the drain valve 213 can also be connected to a water pump for active pumping and drainage, thereby improving drainage efficiency.

[0033] In one embodiment, in order to control the connection and disconnection between the vacuum isolation tank 21 and the vacuum box 1, the connection component 22 includes a connecting pipe 221 and a switching mechanism 222. The two ends of the connecting pipe 221 are connected to and communicate with the vacuum isolation tank and the vacuum box 1, respectively. The switching mechanism 222 is disposed on the connecting pipe 221 and is used to control the connection and disconnection of the connecting pipe 221.

[0034] Specifically, in one feasible embodiment, please refer to Figure 2The switching mechanism 222 includes an electrically controlled valve 2221, which is installed on the connecting pipe 221. By opening the electrically controlled valve 2221, the connecting pipe 221 can be opened to connect the vacuum isolation tank 21 and the vacuum box 1. Conversely, by closing the electrically controlled valve 2221, the connecting pipe 221 can be blocked to close the connection between the vacuum isolation tank 21 and the vacuum box 1.

[0035] Specifically, in another feasible embodiment, please refer to Figure 3 In order to improve the drainage rate, the number of the connecting pipes 221 is at least two, so as to carry out multi-channel drainage.

[0036] Furthermore, to synchronously control the opening and closing of multiple connecting pipes 221, the switching mechanism 222 includes a sealing cap 2222 and a hydraulic push rod 2223. The sealing caps 2222 are fitted onto the top ends of each connecting pipe 221, and the hydraulic push rods 2223 are installed inside the vacuum chamber 1. The telescopic ends of the hydraulic push rods 2223 are connected to each of the sealing caps 2222 via brackets, driving the sealing caps 2222 to lift and open the connecting pipes 221, or driving the sealing caps 2222 to press down and close the connecting pipes 221. There are two hydraulic push rods 2223, and a bracket connects the telescopic ends of the two hydraulic push rods 2223. Each sealing cap 2222 is fixed to the bracket and aligned with the top end of each connecting pipe 221. When the hydraulic push rods 2223 extend or retract, the sealing caps 2222 can be controlled to lift and lower, corresponding to the opening and closing of the connecting pipes 221, respectively.

[0037] Understandably, the hydraulic push rod 2223 can be installed in the vacuum chamber 1 in a recessed manner, and a seal is provided between its installation position and the inner bottom wall of the vacuum chamber 1 to prevent liquid from seeping in.

[0038] In one embodiment, in order to provide feedback on the liquid level height, the liquid level feedback component 23 includes a liquid level sensor 2301, which is installed inside the vacuum chamber 1 and also inside the vacuum isolation tank 21. The liquid level sensor 2301 in the vacuum chamber 1 is used to provide feedback on the liquid level height that submerges the bottommost spray head, while the liquid level sensor 2301 in the vacuum isolation tank 21 is used to provide feedback on whether the water has been drained.

[0039] Understandably, the liquid level sensor 2301 can be a photoelectric liquid level sensor. The photoelectric liquid level sensor can be set at the warning liquid level height. When the liquid level reaches this height, it provides signal feedback. Therefore, the photoelectric liquid level sensor can also be set in the connecting pipe 221 and on the drain port of the vacuum isolation tank 21, respectively monitoring whether the liquid in the vacuum box 1 is emptied and whether the liquid in the vacuum isolation tank 21 is emptied. The liquid level sensor 2301 can also be other liquid level sensors with liquid level monitoring effects.

[0040] It should be noted that the number of liquid level sensors 2301 is not limited in this embodiment. It is known that at least one photoelectric liquid level sensor is provided at the warning water level of the vacuum box 1 and the drain water level of the vacuum isolation tank 21. Preferably, a photoelectric liquid level sensor can also be provided in the connecting pipe 221 and at a higher liquid level position of the vacuum isolation tank 21, which can form a more multi-dimensional liquid level position feedback.

[0041] In one embodiment, to form basic automated control, please refer to... Figure 4 It also includes a controller 3. The liquid level sensor 2301, the connecting component 22, the vacuum pump 212, the drain valve 213, and the pipeline 214 are all electrically connected to the controller 3. The liquid level sensor 2301 is divided into a sensor installed in the vacuum chamber 1 and a sensor installed in the vacuum isolation tank 21. The connecting component 22 mainly connects the on / off mechanism 222 to the controller 3. If an electric control valve 2221 is used, the electric control valve 2221 is electrically connected to the controller 3. If a hydraulic push rod 2223 is used, the hydraulic push rod 2223 is electrically connected to the controller 3. The liquid level sensor 2301 in the vacuum chamber 1 sends a signal indicating that the water level has reached the warning level to the controller 3. The controller 3 then controls the on / off mechanism 222 to open for a period of time to drain the water into the vacuum isolation tank 21, and then closes it. After closing, the drain valve 213 is opened, and at the same time as the drain valve 213 is opened, the pipeline 214 is opened. The liquid level sensor 2301 in the vacuum isolation tank 21 detects that the water has been drained and sends a signal to the controller 3. The controller 3 then closes the drain valve 213, closes the pipeline 214, and then starts the vacuum pump 212 to create a vacuum.

[0042] Understandably, a solenoid valve is installed in pipe 214, mainly to control the opening and closing of the solenoid valve; among them, controller 3 can be a PLC programmable controller, and the above control can be achieved using conventional methods of existing technology, which will not be elaborated on here.

[0043] It should be noted that the connecting pipe between vacuum pump 101 and vacuum chamber 1, and the connecting pipe between vacuum suction pump 212 and tank 211 are all equipped with electrically controlled valves. Correspondingly, vacuum chamber 1 and tank 211 are also equipped with pressure sensors. Based on the negative pressure level, the valves are closed to cut off the connection with the pump body and maintain the internal vacuum level. The above are all conventional methods in this technical field and will not be elaborated on further here.

[0044] The specific working process of this utility model is as follows: When the on / off mechanism 222 is normally closed and the spray head is spraying normally, the liquid level sensor 2301 in the vacuum chamber 1 detects that the liquid level has reached the warning level and is about to submerge the bottom spray head. At this time, the on / off mechanism 222 opens to drain the water into the vacuum isolation tank 21, and then closes the on / off mechanism 222. After closing, the drain valve 213 is opened. At the same time as opening the drain valve 213, the pipe 214 is opened to drain the water. The water can also be actively pumped out by a water pump. After the water is drained, the liquid level sensor 2301 in the vacuum isolation tank 21 detects that the water has been drained and sends a signal to the controller 3. The controller 3 then closes the drain valve 213 and closes the pipe 214. The on / off mechanism 222 returns to its initial state, and the vacuum suction pump 212 is turned on to create a vacuum for the next drainage.

[0045] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum chamber for pipe production, characterized in that, include: A vacuum chamber, connected to a vacuum pump, wherein the pumping end of the vacuum pump is installed at the top of the vacuum chamber for drawing a vacuum from the top of the vacuum chamber; as well as A water level control device includes a vacuum isolation tank, a communication component, and a liquid level feedback component. The liquid level feedback component is installed inside the vacuum chamber and is used to monitor the liquid level. The vacuum isolation tank is located at the bottom of the vacuum chamber and is connected to the interior of the vacuum chamber through the communication component. The communication component is used to open or close the passage between the vacuum chamber and the vacuum isolation tank.

2. The vacuum chamber for pipe production according to claim 1, characterized in that, The vacuum isolation container includes a container body and a vacuum pump. The container body is parallel to the length direction of the vacuum chamber and is fixedly connected to it. The vacuum pump is located above the side of the container body to evacuate the container body.

3. The vacuum chamber for pipe production according to claim 1, characterized in that, The connecting component includes a connecting pipe and a switching mechanism. The two ends of the connecting pipe are connected and communicate with the vacuum isolation tank and the vacuum box, respectively. The switching mechanism is disposed on the connecting pipe and is used to control the opening and closing of the connecting pipe.

4. The vacuum chamber for pipe production according to claim 3, characterized in that, The on / off mechanism includes an electrically controlled valve, which is installed on the connecting pipe.

5. The vacuum chamber for pipe production according to claim 3, characterized in that, The number of connecting pipes is at least two.

6. The vacuum chamber for pipe production according to claim 5, characterized in that, The switching mechanism includes a sealing cover and a hydraulic push rod. The sealing covers are fitted onto the top of the connecting pipe one by one. The hydraulic push rod is installed inside the vacuum chamber. The telescopic end of the hydraulic push rod is connected to each of the sealing covers through a bracket, driving the sealing cover to lift up and open the connecting pipe, or driving the sealing cover to press down and close the connecting pipe.

7. The vacuum chamber for pipe production according to claim 2, characterized in that, The tank is equipped with a drain valve.

8. The vacuum chamber for pipe production according to claim 7, characterized in that, An openable pipe is provided on the upper side of the tank for connecting to the atmosphere.

9. The vacuum chamber for pipe production according to claim 8, characterized in that, The liquid level feedback component includes a liquid level sensor, which is installed inside the vacuum chamber and also inside the vacuum isolation tank.

10. The vacuum chamber for pipe production according to claim 9, characterized in that, It also includes a controller, and the liquid level sensor, vacuum pump, connecting component, drain valve and pipeline are all electrically connected to the controller.

Images