Water and pressure testing device for injection molding machine

Abstract

The utility model relates to the technical field of water testing of injection molding machines, and discloses a water testing and pressure measuring device for an injection molding machine, which comprises a vehicle body and a water supply module positioned on the vehicle body, the water supply module comprises a water tank, a water pump and a one-way valve; the water pump unidirectionally pumps water in the water tank to the waterway detection module; the water path detection module comprises a comparison water path and a test water path which are connected with each other, and a detection structure for detecting whether the test water path leaks water, and one end, far away from the test water path, of the comparison water path is connected with the one-way valve; the detection structure comprises a first opening and closing structure for controlling the connection and disconnection of the comparison water path and the test water path, a second opening and closing structure for controlling the connection and disconnection of a water outlet of the test water path, and a first pressure gauge and a second pressure gauge respectively positioned on the comparison water path and the test water path; the water and pressure testing device can judge whether the tested waterway leaks water or not by directly comparing the values of the first pressure gauge and the second pressure gauge, the labor intensity is reduced, and the accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water testing of injection molding machines, in particular to a water testing and pressure measuring device used in injection molding machines. Background Art

[0002] The traditional method of testing the water circuit (water circuit inside the product) in the injection molding machine factory is to use the workshop water source to test the water. The test water circuit is connected to the workshop water source through a pipeline, and the water pressure of the workshop water source is 0.3MPa. That is, after the gas in the test water circuit is discharged, it is maintained at a water pressure of 0.3MPa for 24 hours. The employees manually find out whether there is a water outlet in the test water circuit to determine whether the test water circuit is qualified. However, the location of the workshop water source is fixed. If the location of the test water circuit is far away from the workshop water source, a long pipeline is required for connection. The pipelines piled on the ground will hinder the employees who are walking, and in serious cases, they will trip and injure the employees.

[0003] A Chinese patent with application number 202220506433.4 discloses a water testing device for an injection molding machine cooler, comprising a movable water testing tank, a water storage chamber for storing water being provided on the water testing tank, and wheels being rotatably installed on the bottom of the water testing tank; a water outlet joint and a water pump, one end of the water outlet joint being connected to the water storage chamber through the water pump, and the other end of the water outlet joint being used to be connected to the water inlet interface of the cooler, the water pump being used to transport the water in the water storage chamber to the water outlet joint, and a plurality of water outlet joints being provided; a water dividing block, a water dividing chamber, a water dividing inlet and a water dividing outlet being provided on the water dividing block, the number of the water dividing outlets being the same as the number of the water outlet joints and being assembled one-to-one, each water dividing outlet being connected to the water dividing inlet through the water dividing chamber, and the water dividing inlet being connected to the water pump.

[0004] This solution facilitates the water test by moving the water test tank to the test waterway where the water test is required. However, it is still necessary to manually find and identify whether there is a water outlet in the test waterway that causes water leakage, which is labor-intensive and has low accuracy. Utility Model Content

[0005] The utility model aims at the shortcomings of the prior art that searching and judging the water leakage point by human eyes leads to high labor intensity and low accuracy, and provides a water testing and pressure measuring device used in an injection molding machine.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A water testing and pressure measuring device used in an injection molding machine comprises a vehicle body and a water supply module located on the vehicle body, wherein a water circuit detection module is connected to the water supply module, the water supply module comprises a water tank, a water pump which one-way pumps water in the water tank to the water circuit detection module, and a one-way valve which is arranged between the water pump and the water circuit detection module and which limits the backflow of water; the water circuit detection module comprises a comparison water circuit and a test water circuit which are connected to each other, and a detection structure which detects whether the test water circuit is leaking, wherein one end of the comparison water circuit which is away from the test water circuit is connected to the one-way valve, and the detection structure comprises a first opening and closing structure which controls the on-off of the comparison water circuit and the test water circuit, a second opening and closing structure which controls the on-off of a water outlet of the test water circuit, and a first pressure gauge and a second pressure gauge which are respectively arranged on the comparison water circuit and the test water circuit, wherein when the difference between the first pressure gauge and the second pressure gauge is greater than the error value between the two, there is a leak in the test water circuit; otherwise, it represents that there is no leak in the test water circuit.

[0008] With the above scheme, in the prior art, when the product leaves the factory, the test water circuit inside the product is tested with a water pressure of 0.3MPa. However, when the product is actually used, the water pressure of the test water circuit inside the product is often higher than 0.3MPa, which makes the test water circuit leak when in use, that is, insufficient test pressure when the injection molding machine leaves the factory may cause the possibility of water circuit failure when the injection molding machine is in use. Therefore, it is necessary to perform a pressurized test when setting up the injection molding machine at the factory. The above scheme can simultaneously achieve pressurization and detection. The test water circuit is connected to the comparison water circuit, the first opening and closing structure and the second opening and closing structure are opened, the water pump is turned on, and the water in the water tank is pumped to the test water circuit in a one-way manner until the gas inside the test water circuit is emptied, the second opening and closing structure is closed, and the water pump continues to pump water to the test water circuit. The water pressure inside the test water circuit gradually rises to reach the preset value for detection, and the water pump stops. Due to the presence of the one-way valve, water will not flow back, the water pressure is maintained at the preset value, and the water pressure in the comparison water circuit and the test water circuit is equal. At this time, the first opening and closing structure is closed, the comparison water channel is disconnected from the test water channel, the first pressure gauge detects the water pressure of the comparison water channel, and the second pressure gauge detects the water pressure of the test water channel. The values ​​of the first pressure gauge and the second pressure gauge can be directly compared to determine whether the test water channel is leaking. Only when there is a leak does it need to manually find the water outlet point, which reduces labor intensity while improving accuracy.

[0009] Preferably, the first opening and closing structure includes a main pipe having one end sealed and connected to the comparison water circuit, and at least one water branch that can be connected to the test water circuit is arranged on the main pipe along its axial direction, and each water branch is provided with a first control valve for controlling the opening and closing of the water branch, and each water branch is provided with a second pressure gauge.

[0010] With the above scheme, water flows into the test water channel after passing through the comparison water channel, the main pipe and the water branch in sequence. If one water branch is set, one test water channel can be tested at the same time; if multiple water branches are set, multiple test water channels can be tested at the same time, thereby improving the detection efficiency; each water branch is provided with a first control valve, so that the opening and closing of each water branch can be controlled separately, so the number of test water channels tested at the same time can also be adjusted by controlling the number of openings and closings of the first control valve. In addition, when any water branch is damaged or fails, it can be closed and repaired separately. The water branch is connected to the test water channel, and the second pressure gauge is provided on the water branch. Detecting the water pressure in the water branch is to detect the water pressure in the test water channel.

[0011] Preferably, a diversion part is provided on at least one water-passing branch, and the diversion part includes a diversion pipe which can be sealed and connected with the water-passing branch, and at least one diversion joint provided on the diversion pipe which can connect the diversion pipe with the test water circuit, and each diversion joint is provided with a second control valve for controlling the opening and closing of the diversion joint, and a second pressure gauge is provided on the diversion pipe.

[0012] With the above scheme, water flows into the test water circuit after passing through the water branch, the diverter pipe and the diverter joint in sequence. One diverter joint is provided, and one water branch can detect one test water circuit; multiple diverter joints are provided so that one water branch can test multiple test water circuits at the same time, further improving the detection efficiency; each diverter joint is provided with a second control valve, so that the opening and closing of each diverter joint can be controlled separately, so the number of test water circuits detected at the same time can also be adjusted by controlling the number of openings and closings of the second control valve. The second pressure gauge is provided on the diverter pipe, and the water pressure in the test water circuit is detected by detecting the water pressure in the diverter pipe.

[0013] Preferably, the second opening and closing structure is a hydraulic quick connector arranged on the water outlet of the test water channel.

[0014] By adopting the above scheme, the hydraulic quick connector can quickly realize the opening and closing of the water outlet of the test water channel.

[0015] Preferably, a control structure is provided on the comparison water circuit to control the water pump to start up to pressurize the test water circuit or to control the water pump to shut down when the pressure reaches a preset value.

[0016] With the above solution, when the control structure detects that the water pressure has reached a preset value, it controls the water pump to shut down and stop pressurizing. There is no need for employees to wait for pressurization and recognize pressure changes with the human eye, which reduces labor intensity and increases accuracy.

[0017] Preferably, the control structure includes a controller electrically connected to the water pump for controlling the start and stop of the water pump, and a pressure sensor disposed in the comparison water channel for sensing the internal water pressure thereof, and the pressure sensor is signal-connected to the controller.

[0018] With the above solution, the pressure sensor detects and compares the water pressure in the water circuit and feeds back to the controller. When the water pressure reaches the preset value, the controller controls the water pump to turn off; when pressurization is required, the controller controls the water pump to turn on.

[0019] Preferably, a pressure tank is provided on the comparison water channel in sealed communication with the test water channel to smoothly change the water pressures in the comparison water channel and the test water channel.

[0020] When adopting the above solution, the way the water pump pumps water to pressurize it will generally cause a more drastic change in water pressure, making it more difficult for the water pump to stop at the moment the water pressure reaches the preset value. Therefore, a pressure tank is set up to control the smooth change of water pressure and make the stopping of the water pump more accurate.

[0021] Preferably, a water changing structure is provided between the water tank and the water pump to facilitate water changing in the water tank. The water changing structure includes a water pipe connected to the water tank, a connecting pipe connected to the water inlet of the water pump, and a hose whose two ends are respectively detachably connected to the water pipe and the connecting pipe. A third control valve for controlling the opening and closing of the water pipe is provided on the water pipe.

[0022] By adopting the above scheme, the water in the water tank needs to be changed regularly. First, close the third control valve, remove one end of the hose from the water pipe or the connecting pipe, and then open the third control valve to allow the water in the water tank to flow out. Then close the third control valve to store water in the water tank, and reconnect the hose to the water pipe or the connecting pipe in a sealed manner.

[0023] The utility model has significant technical effects due to the adoption of the above technical scheme: the water pump pumps water into the test water circuit, the hydraulic quick connector is closed after the test water circuit is exhausted, and cooperates with the one-way valve to steadily increase the pressure of the comparison water circuit and the test water circuit under the action of the water pump and the pressure tank, and after the pressure sensor senses that the water pressure reaches a preset value, it transmits a signal to the controller to control the water pump to be closed, and the one-way valve limits the backflow of water to maintain the pressure of the comparison water circuit and the test water circuit, and the pressure is maintained for two hours after the first control valve is closed. By observing the difference displayed by the first pressure gauge and the second pressure gauge, it can be determined whether the test water circuit is leaking, and the provision of multiple water branches and diversion joints can test multiple test water circuits at the same time, thereby improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an axonometric diagram of a water testing and pressure measuring device used in an injection molding machine in an embodiment;

[0025] Figure 2 yes Figure 1 A in the enlarged view;

[0026] Figure 3 yes Figure 1 The enlarged view of point B in the figure;

[0027] Figure 4is a disassembled diagram of a water testing and pressure measuring device used in an injection molding machine in an embodiment;

[0028] Figure 5 yes Figure 4 The enlarged view of point C in the figure;

[0029] Figure 6 yes Figure 4 The enlarged view of D in the figure;

[0030] Figure 7 yes Figure 4 The enlarged view of point E in the figure;

[0031] Figure 8 yes Figure 4 Enlarged view of point F in FIG.

[0032] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Vehicle body; 2. Water tank; 3. Water pump; 4. One-way valve; 5. Comparison water circuit; 6. Test water circuit; 7. First pressure gauge; 8. Second pressure gauge; 9. Main pipe; 10. Water branch; 11. First control valve; 12. Diverter pipe; 13. Diverter joint; 14. Second control valve; 15. Hydraulic quick connector; 16. Controller; 17. Pressure sensor; 18. Pressure tank; 19. Water pipe; 20. Connecting pipe; 21. Hose; 22. Third control valve; 23. Fourth control valve. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Example

[0035] A water testing and pressure measuring device used in injection molding machines, referring to Figures 1 to 8 , including a vehicle body 1, a water supply module is arranged on the vehicle body 1, and a water channel detection module is connected to the water supply module. The water supply module includes a water tank 2 and a water pump 3 (the water pump is a light vertical multi-stage centrifugal pump with a model number of CDL1-23FSWPC produced by Jiangsu Nanfang Pump Industry Group Co., Ltd.) for one-way pumping water from the water tank 2 to the water channel detection module. A one-way valve 4 is arranged between the water pump 3 and the water channel detection module to prevent water from flowing back from the water channel detection module to the water pump 3.

[0036] The water channel detection module includes a comparison water channel 5 and a test water channel 6 connected to each other, and one end of the comparison water channel 5 away from the test water channel 6 is connected to the one-way valve 4. A detection structure for detecting whether the test water channel 6 is leaking is arranged between the comparison water channel 5 and the test water channel 6. The detection structure includes a first opening and closing structure for controlling the opening and closing of the comparison water channel 5 and the test water channel 6 and a second opening and closing structure for controlling the opening and closing of the water outlet of the test water channel 6. The comparison water channel 5 is provided with a first pressure gauge 7 for detecting the water pressure in the comparison water channel 5, and the test water channel 6 is provided with a second pressure gauge 8 for detecting the water pressure in the test water channel 6.

[0037] After the outlet of the test water circuit 6 is sealed, the water pressure in the water circuit 5 and the test water circuit 6 is increased to a preset value and then the two are disconnected. After a period of time, the values ​​of the first pressure gauge 7 and the second pressure gauge 8 can be directly compared to determine whether the test water circuit 6 is leaking. When the difference between the first pressure gauge 7 and the second pressure gauge 8 is greater than the error value between the two, there is a leak in the test water circuit 6. Only after the leak is found, it is necessary to manually find the water outlet, which reduces labor intensity and improves accuracy; otherwise, it means that there is no leak in the test water circuit 6, and the detection is completed. Under the limitations of the accuracy of the first pressure gauge 7 and the second pressure gauge 8 and the preparation process of the product's test water circuit 6, the readings of the first pressure gauge 7 and the second pressure gauge 8 will not be completely equal, that is, there is an error value. In this embodiment, the error value is set to 4% to 6% of the reading of the first pressure gauge 7. If the values ​​displayed by the first pressure gauge 7 and the second pressure gauge 8 are within the error value, it can be considered that there is no leak; otherwise, there is a leak. In this embodiment, the error value is set to 5% of the reading of the first pressure gauge 7.

[0038] The first opening and closing structure includes a main pipe 9 with one end sealedly connected to the comparison waterway 5, and at least one water branch 10 that can be connected to the test waterway 6 is arranged on the main pipe 9 along its axial interval, and each water branch 10 is provided with a first control valve 11 for controlling the opening and closing of the water branch 10. A diversion part is arranged on at least one water branch 10, and the diversion part includes a diversion pipe 12 that can be sealedly connected to the water branch 10 and at least one diversion joint 13 arranged on the diversion pipe 12 that can connect the diversion pipe 12 with the test waterway 6, and each diversion joint 13 is provided with a second control valve 14 for controlling the opening and closing of the diversion joint 13, and the second pressure gauge 8 is arranged on the diversion pipe 12.

[0039] The water flows through the comparison waterway 5, the main pipe 9, the water branch 10, the diverter pipe 12 and the diverter joint 13 in sequence and then flows into the test waterway 6. By controlling the opening and closing number of the first control valve 11 and the second control valve 14, the number of test waterways 6 to be tested simultaneously can be controlled. The second pressure gauge 8 is arranged on the diverter pipe 12. Since the water flows through the main pipe 9, the water branch 10, the diverter pipe 12, the diverter joint 13 and the test waterway 6, the water pressure in the test waterway 6 is tested by testing the water pressure in the diverter pipe 12.

[0040] In this embodiment, two water branches 10 and first control valves 11 are provided, each water branch 10 is provided with a shunt pipe 12, each shunt pipe 12 is provided with four shunt joints 13, and each shunt joint 13 is provided with a second control valve 14, that is, this embodiment can simultaneously detect up to eight test waterways 6. In addition, in this embodiment, a fourth control valve 23 is provided between the shunt pipe 12 and the second pressure gauge 8 to control the on-off between the shunt pipe 12 and the second pressure gauge 8.

[0041] The second opening and closing structure is a hydraulic quick connector 15 provided on the water outlet of the test water channel 6 , which can quickly realize the opening and closing of the water outlet of the test water channel 6 .

[0042] A control structure for controlling the water pump 3 to be turned on or off is provided on the comparison water circuit 5, and the control structure includes a controller 16 electrically connected to the water pump 3 and a pressure sensor 17 provided in the comparison water circuit 5, and the pressure sensor 17 is connected to the controller 16 by signal. In this embodiment, the controller 16 is a frequency converter (the frequency converter is a constant pressure water supply dedicated frequency converter with model number JT386FA produced by Huizhou Jintian Technology Co., Ltd.).

[0043] The pressure sensor 17 detects and compares the water pressure in the water circuit 5 and feeds back to the controller 16. When the water pressure reaches the preset value, the controller 16 controls the water pump 3 to stop pressurizing. There is no need for employees to wait for pressurization and the human eye to identify the pressure change, which reduces labor intensity and increases accuracy. When pressurization is required, the water pump 3 is controlled to start by the controller 16. The preset value is a pressure value greater than 0.3MPa, and the specific value is formulated according to the test requirements of the test water circuit 6. The control method of the controller 16 is a prior art and will not be described in detail here.

[0044] A pressure tank 18 (a vertical pressure tank of model LHA-24L produced by VAREM) is provided in a sealed manner on the comparison waterway 5 to control the water pressure to change smoothly. The principle, installation and control method of the pressure tank 18 are prior art and will not be described in detail here.

[0045] A water changing structure is provided between the water tank 2 and the water pump 3 to facilitate water changing in the water tank 2. The water changing structure includes a water pipe 19 connected to the water tank 2, a connecting pipe 20 connected to the water inlet of the water pump 3, and a hose 21 whose two ends are detachably connected to the water pipe 19 and the connecting pipe 20, respectively. The water pipe 19 is provided with a third control valve 22 for controlling the opening and closing of the water pipe 19. If the water in the water tank 2 needs to be changed regularly, the third control valve 22 is closed first, one end of the hose 21 is removed from the water pipe 19 or the connecting pipe 20, and then the third control valve 22 is opened to allow the water in the water tank 2 to flow out. After closing the third control valve 22, water is stored in the water tank 2, and the hose 21 is re-sealed and connected to the water pipe 19 or the connecting pipe 20. The detachable connection between the hose 21 and the water pipe 19 and the connecting pipe 20 is a prior art. In this embodiment, the detachable connection is achieved by an existing pipe joint, which will not be described in detail here.

[0046] The first control valve 11, the second control valve 14, the third control valve 22 and the fourth control valve 23 are ball valves, and the connection and opening and closing methods of the ball valves and the connection and opening and closing methods of the hydraulic quick connector 15 are all prior art and are not described in detail here. The first pressure gauge 7 and the second pressure gauge 8 are seismic pressure gauges.

[0047] The water pump 3 pumps water into the test water circuit 6, and the hydraulic quick connector 15 is closed after the test water circuit 6 is exhausted. In cooperation with the one-way valve 4, the comparison water circuit 5 and the test water circuit 6 are steadily pressurized under the action of the water pump 3 and the pressure tank 18. After the pressure sensor 17 senses that the water pressure reaches a preset value, it transmits a signal to the controller 16 to control the water pump 3 to close. The one-way valve 4 limits the backflow of water to maintain the pressure of the comparison water circuit 5 and the test water circuit 6. After closing the first control valve 11, keep it for two hours. By observing the difference displayed by the first pressure gauge 7 and the second pressure gauge 8, it can be determined whether the test water circuit 6 is leaking.

[0048] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A water testing and pressure measuring device for an injection molding machine, comprising a vehicle body (1) and a water supply module located on the vehicle body (1), wherein a water channel detection module is connected to the water supply module, and characterized in that: The water supply module comprises a water tank (2), a water pump (3) for unidirectionally pumping water from the water tank (2) to the water channel detection module, and a one-way valve (4) for limiting water backflow arranged between the water pump (3) and the water channel detection module; the water channel detection module comprises a comparison water channel (5) and a test water channel (6) connected to each other, and a detection structure for detecting whether the test water channel (6) is leaking, the end of the comparison water channel (5) away from the test water channel (6) is connected to the one-way valve (4), the detection structure comprises a first opening and closing structure for controlling the opening and closing of the comparison water channel (5) and the test water channel (6), a second opening and closing structure for controlling the opening and closing of a water outlet of the test water channel (6), and a first pressure gauge (7) and a second pressure gauge (8) respectively located on the comparison water channel (5) and the test water channel (6); when the difference between the first pressure gauge (7) and the second pressure gauge (8) is greater than the error value between the two, there is a leak in the test water channel (6); On the contrary, it means that there is no leakage in the test water channel (6).

2. The water testing and pressure measuring device for an injection molding machine according to claim 1, characterized in that: The first opening and closing structure comprises a main pipe (9) having one end sealedly connected to the comparison water channel (5), at least one water-passing branch (10) which can be connected to the test water channel (6) is arranged on the main pipe (9) along its axial direction, and each water-passing branch (10) is provided with a first control valve (11) for controlling the opening and closing of the water-passing branch (10), and each water-passing branch (10) is provided with a second pressure gauge (8).

3. The water testing and pressure measuring device for an injection molding machine according to claim 2, characterized in that: A flow diversion portion is provided on at least one water-passing branch (10), the flow diversion portion comprising a flow diversion pipe (12) capable of being sealed and connected to the water-passing branch (10) and at least one flow diversion joint (13) provided on the flow diversion pipe (12) capable of connecting the flow diversion pipe (12) with a test water path (6), and each flow diversion joint (13) is provided with a second control valve (14) for controlling the opening and closing of the flow diversion joint (13), and a second pressure gauge (8) is provided on the flow diversion pipe (12).

4. The water testing and pressure measuring device for an injection molding machine according to claim 1, characterized in that: The second opening and closing structure is a hydraulic quick connector (15) arranged on the water outlet of the test water channel (6).

5. The water testing and pressure measuring device for an injection molding machine according to claim 1, characterized in that: A control structure is provided on the comparison water circuit (5) for controlling the water pump (3) to start up to pressurize the test water circuit (6) or for controlling the water pump (3) to shut down when the pressure reaches a preset value.

6. The water testing and pressure measuring device for an injection molding machine according to claim 5, characterized in that: The control structure comprises a controller (16) electrically connected to the water pump (3) for controlling the start and stop of the water pump (3) and a pressure sensor (17) arranged in the comparison water channel (5) for sensing the internal water pressure thereof, wherein the pressure sensor (17) is signal-connected to the controller (16).

7. The water testing and pressure measuring device for an injection molding machine according to claim 1, characterized in that: A pressure tank (18) is provided on the comparison water channel (5) in sealed communication with the comparison water channel (5) to smoothly change the water pressure in the comparison water channel (5) and the test water channel (6).

8. The water testing and pressure measuring device for an injection molding machine according to claim 1, characterized in that: A water changing structure is provided between the water tank (2) and the water pump (3) to facilitate water changing in the water tank (2). The water changing structure comprises a water pipe (19) in communication with the water tank (2), a connecting pipe (20) in communication with a water inlet of the water pump (3), and a hose (21) having two ends detachably connected to the water pipe (19) and the connecting pipe (20), respectively. A third control valve (22) is provided on the water pipe (19) to control the opening and closing of the water pipe (19).

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