A kind of hose automatic tying pressure testing device and control method

Abstract

The present invention provides a device and control method for automatic hose tying and pressure testing, the device comprising a control cabinet, a PLC controller is arranged in the control cabinet; a common interface is arranged at the upper part of the control cabinet, and is used to connect the hose interface; a tying mechanism is driven by a first motor, and the PLC controller controls the first motor to drive the tying mechanism to wind the steel wire around the connecting part of the hose and the hose interface; a clamping mechanism comprises a pressing plate; a hydraulic control unit comprises an oil pump and a first oil cylinder, and the oil pump motor drives the first oil cylinder to drive the pressing plate to rise or fall; a water pressure control unit comprises a water supply tank, a return water tank, a water pump, a water inlet valve, and an exhaust valve. The present invention can automatically realize the tying of the hose and the hose interface, and perform a pressure test on the tying hose, avoiding the influence of unstable tying interface quality caused by manual tying, and timely testing the hose tying interface, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hoses, and in particular to a hose automatic tying and pressure testing device and a control method. Background Art

[0002] At present, manual tying machines are often used to tie hoses. The density, length and tension of the wire winding are manually controlled. Due to the different working conditions and strength of different workers, the connection quality between the hose and the interface is directly affected, the production process is unstable, and defective products cannot be found in time. After the hoses are tied, they are manually stacked and transported to the water test line for testing. Sampling inspection has certain quality risks and takes a long time. Summary of the invention

[0003] The object of the present invention is to provide an automatic hose splicing and pressure testing device and a control method, which can automatically realize the splicing of hoses and hose interfaces, and perform pressure tests on the spliced ​​hoses, thereby avoiding the influence of unstable quality of the splicing interfaces due to manual splicing, and timely performing water tests on the hose splicing interfaces, thereby reducing the waste of transportation, waiting, and repeated actions, improving the stability and reliability of production, and improving work efficiency.

[0004] In order to achieve the above object, the present invention mainly adopts the following technical solutions:

[0005] A hose automatic tying and pressure testing device, the device comprising:

[0006] A control cabinet, wherein a PLC controller is arranged in the control cabinet;

[0007] A common interface, which is arranged at the upper part of the control cabinet and is used to connect a hose interface;

[0008] The tying mechanism is driven by a first motor, and the PLC controller controls the first motor to drive the tying mechanism to wind the steel wire around the connection part between the hose and the hose interface;

[0009] A clamping mechanism, the clamping mechanism comprising a pressing plate;

[0010] A hydraulic control unit, comprising an oil pump and a first oil cylinder, wherein an output end of the first oil cylinder is connected to the pressing plate, and an oil pump motor drives the first oil cylinder to drive the pressing plate to rise or fall;

[0011] The water pressure control unit includes a water supply tank, a return water tank, a water pump, a water inlet valve, and an exhaust valve. The water inlet valve is arranged at a common interface. The water pump injects water in the water supply tank into the hose through the water inlet valve, and the water in the hose flows back to the return water tank through the exhaust valve.

[0012] In some embodiments, a clamping disc is provided on the common interface, and the clamping disc locks the connection between the common interface and the hose interface.

[0013] In some embodiments, the device further comprises a storage box for storing the hose.

[0014] In some embodiments, the hydraulic control unit further includes a first pressure sensor, and the first pressure sensor is used to detect the pressure value in the first oil cylinder.

[0015] In some embodiments, the water pressure control unit further includes a second pressure sensor, and the second pressure sensor is used to detect the water pressure value in the hose.

[0016] In some embodiments, the hydraulic control unit further includes a second oil cylinder, and a motor drives the second oil cylinder to drive the water pressure bag to rise or fall.

[0017] The present invention also provides a control method for an automatic bonding and pressure testing device, the method comprising the following steps:

[0018] Hose tying: Connect the hose interface to the common interface. According to the set tension, length and density of the steel wire wrapped around the hose, the PLC controller controls the first motor to drive the tying mechanism to wrap the steel wire around the connection part between the hose and the hose interface.

[0019] Water injection preparation: The PLC controller controls the oil pump motor to start, and the first oil cylinder pushes the pressing plate to rise until the pressure value in the first oil cylinder reaches the first pressure setting value, and then the pressing plate stops rising, and the pressing plate presses the end of the hose away from the hose interface;

[0020] Water injection: The PLC controller controls the water pump to inject water into the hose until the water pressure in the hose reaches the second pressure setting value;

[0021] Pressure holding test: After the water in the hose is retained in the hose for a set time, check whether the water pressure in the hose changes to determine the reliability of the connection between the hose and the hose interface;

[0022] Drainage and pressure relief: The PLC controller controls the exhaust valve to open and drain the water in the hose;

[0023] After the test: remove the hose interface from the public interface and store them in a classified manner.

[0024] In some embodiments, in the water injection preparation stage, after the pressure plate stops rising, the second oil cylinder pushes the hose water pressure bag to rise a second distance, and then prepares for water injection.

[0025] In some embodiments, the drainage and pressure relief stage also includes a PLC controller controlling the oil pump to start, and after the second oil cylinder descends a second distance, the first oil cylinder drives the pressure plate to descend until the pressure in the first oil cylinder reaches an initial value.

[0026] The automatic tying and pressure testing device provided by the present invention controls the tension, winding length and density of the steel wire winding through the PLC when the hose and the hose interface are tying, thereby ensuring the consistency of the connection between the interface and the hose. After the tying is completed, the PLC control device automatically completes the water pressure test of the hose interface to detect the safety and reliability of the connection between the hose and the hose interface. After the tying is completed using this device, there is no need to perform a separate water pressure test on the hose interface, which improves the work efficiency by 50%, eliminates quality risks, and eliminates the phenomenon of missed inspection. It solves the current problems of unstable quality of manual hose tying interfaces and timely and comprehensive verification of process compliance after the hose and the interface are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are 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 also be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the structure of the automatic bonding and pressure testing device provided by the present invention;

[0029] Figure 2 It is a cross-sectional schematic diagram of the common interface and the hose interface;

[0030] Figure 3 It is a schematic diagram of the structure of the clamping mechanism;

[0031] Figure 4 A schematic diagram of the PLC control principle of a specific embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the connection between the hose and the common interface;

[0033] Figure 6 It is a schematic diagram of the pressure plate pressing the hose;

[0034] Figure 7 Schematic diagram of water filling and pressure testing for hose;

[0035] Figure 8 This is a control flow chart of the automatic splicing pressure testing device of the present invention.

[0036] Description of reference numerals:

[0037] 1-pressure test bench; 2-control cabinet; 3-public interface, 31-clamping disc; 4-binding mechanism; 5-pressing mechanism, 51-pressing plate; 6-storage box; 7-first pressure sensor; 8-hose interface; 9-hose; 10-water pressure bag. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The invention provides a hose automatic tying pressure testing device, which is used for automatically tying a hose and a hose interface, and performing a water injection pressure maintenance test on the tied hose to detect the reliability of the connection between the hose and the hose interface.

[0040] like Figure 1 and Figure 2 As shown, the automatic hose splicing and pressure testing device includes a pressure testing platform 1, a control cabinet 2, a splicing mechanism 4 and a clamping mechanism 5. The pressure testing platform 1 and the control cabinet 2 are close together for easy operation. The control cabinet 2 is provided with a PLC controller for controlling the entire device to automatically complete the hose splicing and pressure testing. A common interface 3 is provided on the upper part of the control cabinet 2 for connecting the hose interface 8. A chuck 31 is also provided on the common interface 3 for locking. After the hose interface 8 is connected to the common interface 3, it is locked by the chuck 31 to make the connection between the common interface 3 and the hose interface 8 more secure. The size of the chuck 31 can be selected according to the diameter of the hose interface 8. As shown Figure 5 As shown, the hose 9 is sleeved on the hose interface 8 , and the hose interface 8 is clamped on the common interface 3 through the clamping disc 31 , so that the hose 9 is connected to the common interface 3 .

[0041] like Figure 1 As shown, a tying mechanism 4 is provided on the pressure test bench 1 and is driven by a first motor (not shown in the figure). The PLC controller controls the first motor to drive the tying mechanism 4 to wrap the steel wire around the connecting part of the hose 9 and the hose interface 8.

[0042] like Figure 1 and Figure 3 As shown, a clamping mechanism 5 is also provided on the pressure test platform 1, and the clamping mechanism 5 includes a pressure plate 51 that can rise and fall. When the pressure plate 51 rises, it can clamp the part of the hose away from the hose interface 8, thereby improving the sealing performance of the hose during the water pressure test. The hose automatic tying pressure test device also includes a storage box 6 for storing the hose.

[0043] The automatic hose splicing pressure testing device also includes a hydraulic control unit and a water pressure control unit. The hydraulic control unit includes an oil pump and a first oil cylinder. The output end of the first oil cylinder is connected to a pressure plate 51. The oil pump motor drives the first oil cylinder to move, driving the pressure plate 51 to rise or fall, so that the pressure plate 51 presses or loosens the part of the hose away from the hose interface 8; the hydraulic control unit also includes a first pressure sensor for detecting the pressure value in the first oil cylinder. In some embodiments, a magnetically assisted electric contact pressure gauge is used to detect and display the pressure value in the first oil cylinder. When the pressure value in the first oil cylinder reaches a set value, the magnetically assisted electric contact pressure gauge sends a control signal to the PLC controller, thereby achieving the function of controlling the oil cylinder stroke.

[0044] When the pressure plate 51 presses the hose 9, a water pressure bag is formed when water is injected into the part of the hose between the pressure plate 51 and the hose interface 8. In the process of drainage and pressure relief, in order to quickly drain the water, we can raise the water pressure bag before injecting water, and lower the water pressure bag during drainage to form a height difference and accelerate drainage. In some embodiments, the hydraulic control unit further includes a second oil cylinder, which is used to drive the water pressure bag to rise and fall.

[0045] The water pressure control unit includes a water supply tank, a return water tank, a water pump, an inlet valve, an exhaust valve and a second pressure sensor. The inlet valve is arranged at the common interface 3. The PLC controller controls the water pump motor to inject the water in the water supply tank into the hose 9 through the inlet valve for pressure testing. After the pressure test is completed, the water in the hose 9 flows back to the return water tank through the exhaust valve. The second pressure sensor is used to detect the water pressure value in the hose 9. In some embodiments, a PCM300 pressure transmitter is used to detect the water pressure value in the hose 9. The PCM300 pressure transmitter is connected to the input end of the PLC controller to store the water pressure value in the PLC controller. At the same time, the PCM300 pressure transmitter is also connected to a water pressure gauge for real-time display of the water pressure value in the hose 9.

[0046] like Figure 4The figure shows the PLC control principle diagram of a specific embodiment of the present invention. The PLC controller used is the FX3U-32MT / ES PLC controller produced by Mitsubishi Corporation. In this embodiment, the X0 and X1 input terminals of the PLC controller are respectively connected to the start and emergency stop buttons for controlling the start and stop of the device. The X15 input terminal is connected to the mode selection switch for selecting the manual working mode or the automatic working mode. In the automatic working mode, the two processes of hose 9 tying and water injection pressure test are automatically completed in succession without manual participation. In the manual working mode, the hose 9 tying and water injection pressure test are independently controlled, and the two processes of tying and pressure test are respectively started manually; the X2 and X3 input terminals are connected to the first oil cylinder to send signals to the PLC controller. The X4 and X5 input terminals are connected to the second oil cylinder, and feedback signals are sent to the PLC controller to detect whether the water pressure bag of the hose 9 is in place. The X6 and X7 input terminals are used to detect whether the water inlet valve is in place, the X10 and X11 input terminals are used to detect whether the exhaust valve is in place, and the X12 input terminal is connected to an output terminal of a magnetic-assisted electric contact pressure gauge to detect whether the pressure value in the first oil cylinder reaches the set value. The X13 input terminal is connected to a foot switch signal to control the start and stop of the device. The Y0 output end of the PLC controller is connected to the oil pump motor to control the start and stop of the oil pump motor; the Y1 output end is connected to the water pump motor to control the start and stop of the water pump motor; the Y2 and Y3 output ends are connected to the first oil cylinder to control the rise and fall of the first oil cylinder respectively; the Y4 and Y5 output ends are connected to the second oil cylinder to control the rise and fall of the second oil cylinder respectively; the Y6 and Y7 output ends are connected to the exhaust valve to control the opening and closing of the exhaust valve respectively; the Y10 and Y11 output ends are connected to the water inlet valve to control the opening and closing of the water inlet valve respectively; the Y12 output end is connected to the first motor to control the start and stop of the first motor, and is used to control the working state of the tying mechanism 4.

[0047] like Figure 4 As shown, in some embodiments, the PLC control part also includes an analog input module, such as a FX2N-2AD input module, which serves as an extended input unit of the PLC controller. The PCM3000 pressure transmitter stores the water pressure value in the FX2N-2AD input module, and the PLC controller obtains the water pressure value through the FX2N-2AD input module.

[0048] like Figure 8 As shown, the present invention also provides a control method for an automatic bonding and pressure testing device, the method comprising the following steps:

[0049] Step S1: Hose tying;

[0050] In the initial state, the water inlet valve and the exhaust valve are both closed.

[0051] like Figure 5 As shown, the hose 9 is sleeved on the hose interface 8, and the hose interface 8 is clamped on the common interface 3 through the clamping plate 31, so that the hose 9 is connected to the common interface 3. According to different hose sizes, hose materials and sizes of the hose interface 8, such as the outer diameter of the hose, the outer diameter of the hose interface 8, and the connection length between the hose and the hose interface 8, the PLC controller sets the tension, winding length and winding density of the steel wire wound on the hose, and the PLC controller controls the first motor to drive the tying mechanism to wind the steel wire around the connection part of the hose 9 and the hose interface 8 according to the set tension, winding length and winding density.

[0052] By controlling the tying mechanism through the PLC controller to wind the steel wire around the connection between the hose 9 and the hose interface 8, the stability and consistency of the tying quality can be ensured, and the inconsistency in tying force, winding length and winding density caused by manual tying can be avoided, resulting in unstable tying quality.

[0053] Step S2: water injection preparation;

[0054] After the splicing is completed, the PLC controller controls the oil pump motor to start, driving the first oil cylinder to push the pressing plate 51 up, until the pressure value in the first oil cylinder reaches the first pressure setting value, the first oil cylinder stops rising, and the first distance the first oil cylinder rises at this time is recorded. The pressing plate 51 presses the end of the hose 9 away from the hose interface 8. Figure 6 As shown, the hose 9 is now pressed by the pressure plate 51 .

[0055] like Figure 7 As shown, in some embodiments, after the first oil cylinder stops working and the pressure plate 51 stops rising, the PLC controller controls the second oil cylinder (not shown in the figure) to work, pushing the water pressure bag 10 on the hose 9 to rise. The PLC controller sets the second oil cylinder to rise a second distance. After the second oil cylinder rises to the set distance, it stops working to prepare for water injection into the hose 9. The rising distance of the second oil cylinder is controlled by the PLC controller by controlling the stroke switch. By lifting the water pressure bag 10, a height difference is formed between the water pressure bag 10 and the hose interface 8. First, it is convenient to test the water pressure at the hose interface 8. Second, by lowering the water pressure bag 10 later, it is convenient to quickly empty the water in the hose 9 during the drainage and pressure relief process.

[0056] Step S3: water injection;

[0057] The PLC controller controls the water inlet valve and the exhaust valve to open, and starts the water pump motor to inject water into the hose 9. When the water pressure in the hose 9 reaches the second pressure setting value, the PLC controller controls the water inlet valve to close, stops injecting water into the hose 9, starts the timer in the PLC controller, and after timing Ts, closes the exhaust valve to ensure that the air in the water pressure bag 10 is exhausted. In this way, the measured water pressure is closer to the actual situation.

[0058] Step S4: pressure holding test;

[0059] After the water in the hose 9 is retained in the hose 9 for a set time, observe whether the water pressure in the water pressure gauge changes. If the water pressure does not change substantially, it is considered that the connection between the hose 9 and the hose interface 8 is reliable and of qualified quality. If the water pressure value changes by more than the set value, it is considered that the connection is unqualified.

[0060] Step S5: draining water and releasing pressure;

[0061] The PLC controller controls the exhaust valve to open, water to enter and water to be discharged. The PLC controller controls the oil pump motor to start, and the second oil cylinder descends, driving the water pressure bag 10 to descend, gradually draining the water in the hose 9, and the second oil cylinder stops descending after descending the second distance; the PLC controller controls the first oil cylinder to stop descending after the first distance, the oil pump motor stops working, and the exhaust valve is closed.

[0062] Step S6: The test ends.

[0063] The hose interface 8 is disassembled from the common interface 3, and qualified products and unqualified products are sorted and stored.

[0064] By means of the automatic splicing pressure test device and control method provided by the present invention, when the hose 9 and the hose interface 8 are spliced, the tension, length and density of the steel wire winding are controlled by the PLC, thereby ensuring the consistency of the connection between the hose 9 and the hose interface 8. After the splicing is completed, the PLC control device automatically completes the water pressure test of the hose interface 8 to detect the safety and reliability of the connection between the hose 9 and the hose interface 8. After the splicing is completed using the device, there is no need to perform a separate water pressure test on the hose interface 8, thereby increasing the work efficiency by 50%, eliminating quality risks, and preventing missed inspections.

[0065] The automatic binding and pressure testing device provided by the present invention can be installed together with an automatic packaging line. Through the joint operation with the packaging line, the production process can be streamlined, thereby reducing the phenomena of hose handling, equipment idle waiting, repeated actions, etc., improving production efficiency and realizing the automation of the production process.

[0066] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A hose automatic tying and pressure testing device, characterized in that: The device comprises, A control cabinet, wherein a PLC controller is arranged in the control cabinet; A common interface, which is arranged at the upper part of the control cabinet and is used to connect a hose interface; The tying mechanism is driven by a first motor, and the PLC controller controls the first motor to drive the tying mechanism to wind the steel wire around the connection part between the hose and the hose interface; A clamping mechanism, the clamping mechanism comprising a clamping plate, when the clamping plate rises, the clamping plate clamps the part of the hose away from the hose interface, and when water is injected into the part of the hose between the clamping plate and the hose interface, a water pressure bag is formed; A hydraulic control unit includes an oil pump, a first oil cylinder and a second oil cylinder, wherein the output end of the first oil cylinder is connected to the pressing plate, the oil pump motor drives the first oil cylinder to drive the pressing plate to rise or fall, and the second oil cylinder drives the water pressure bag to rise or fall, and a height difference is formed between the water pressure bag and the hose interface; The water pressure control unit includes a water supply tank, a return water tank, a water pump, a water inlet valve, and an exhaust valve. The water inlet valve is arranged at a common interface. The water pump injects water in the water supply tank into the hose through the water inlet valve, and the water in the hose flows back to the return water tank through the exhaust valve.

2. The automatic hose tying and pressure testing device according to claim 1 is characterized in that: The common interface is provided with a clamping disc, and the clamping disc locks the connection between the common interface and the hose interface.

3. The automatic hose tying and pressure testing device according to claim 1 is characterized in that: The device also includes a storage box for storing the hose.

4. The automatic hose tying and pressure testing device according to claim 1 is characterized in that: The hydraulic control unit further includes a first pressure sensor, and the first pressure sensor is used to detect the pressure value in the first oil cylinder.

5. The automatic hose tying and pressure testing device according to claim 1 is characterized in that: The water pressure control unit further includes a second pressure sensor, and the second pressure sensor is used to detect the water pressure value in the hose.

6. A control method for an automatic splicing pressure test device, applied to the automatic splicing pressure test device as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: Hose tying: Connect the hose interface to the common interface. According to the set tension, length and density of the steel wire wrapped around the hose, the PLC controller controls the first motor to drive the tying mechanism to wrap the steel wire around the connection part between the hose and the hose interface. Water injection preparation: The PLC controller controls the oil pump motor to start, and the first oil cylinder pushes the pressing plate to rise until the pressure value in the first oil cylinder reaches the first pressure setting value, and then the pressing plate stops rising, and the pressing plate presses the end of the hose away from the hose interface; Water injection: The PLC controller controls the water pump to inject water into the hose until the water pressure in the hose reaches the second pressure setting value; Pressure holding test: After the water in the hose is retained in the hose for a set time, check whether the water pressure in the hose changes to determine the reliability of the connection between the hose and the hose interface; Drainage and pressure relief: The PLC controller controls the exhaust valve to open and drain the water in the hose; After the test: remove the hose interface from the public interface and store them in a classified manner.

7. The control method of the automatic splicing pressure testing device according to claim 6, characterized in that: In the water injection preparation stage, after the pressure plate stops rising, the second oil cylinder pushes the hose water pressure bag to rise a second distance and then prepares for water injection.

8. The control method of the automatic splicing pressure testing device according to claim 7, characterized in that: The drainage and pressure relief stage also includes the PLC controller controlling the oil pump to start, and after the second oil cylinder descends a second distance, the first oil cylinder drives the pressure plate to descend until the pressure in the first oil cylinder reaches the initial value.

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