A pneumatic rotary joint test device

Abstract

The present invention proposes a pneumatic rotary joint test device, including a runout and speed detection device and a test control box. The runout and speed detection device is used to fix the pneumatic rotary joint and complete the adjustment of the rotation speed and the detection of the runout amount. The test control box includes a pneumatic control unit and an interactive unit in a control box. The pneumatic control unit is supplied with air by an air intake unit fixed on the control box. The control monitoring panel located on the control box drives the pneumatic control unit and the runout and speed detection device through the interactive unit to provide test pressure and rotation support for the pneumatic rotary joint. The present invention completes the speed test, leakage test, and shell runout test of the pneumatic rotary joint through the runout and speed detection device and the test control box, which can effectively improve the test accuracy and efficiency of the pneumatic rotary joint.

Description

Technical Field

[0001] The invention relates to the field of pneumatic rotary joint testing devices, in particular to a pneumatic rotary joint testing device. Background Art

[0002] Pneumatic rotary joint is a rotary sealing device used to transmit compressed air. It is particularly suitable for scenarios that require rotary operation. It is widely used in mechanical manufacturing, automated production, metallurgical machinery and other fields.

[0003] The inspection process of pneumatic rotary joints mainly includes the maximum speed test, temperature rise test combined with temperature measuring instrument, leakage test, working pressure range test, constant pressure durability test, pulse durability test and installation requirements (jump test) inspection, etc. Through the above inspection process, the performance and quality of pneumatic rotary joints can be fully evaluated to ensure their reliability and safety in practical applications.

[0004] In the prior art, the above-mentioned test processes need to be carried out one by one, that is, only one test can be completed at the same time, so that it takes a long time to complete the test process of the pneumatic rotary joint, consumes more inspection manpower, and has low test efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention proposes a pneumatic rotary joint testing device, which simultaneously completes the maximum speed test of the pneumatic rotary joint, and combines with a temperature measuring instrument to perform temperature rise test, leakage test, working pressure range test, constant pressure durability test, pulse durability test and installation requirements (jump detection) inspection and other processes.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pneumatic rotary joint test device, comprising:

[0007] The runout and speed detection device comprises a rotation fixing unit and a runout detection unit. The rotation end of the pneumatic rotary joint is connected to the rotation fixing unit. The rotation fixing unit drives the rotation end of the pneumatic rotary joint to complete the rotation process. The runout detection unit is fixedly arranged above the other end of the pneumatic rotary joint and contacts with its upper surface, and is used to test the runout of the pneumatic rotary joint.

[0008] A test control box includes a control box body, in which a pneumatic control unit and an interactive unit are fixedly arranged. The pneumatic control unit is supplied with air by an air intake unit fixed on the control box body and supplies air to an air intake end of a pneumatic rotary joint. A control monitoring panel is fixedly arranged on the control box body. The control monitoring panel completes the test process of the pneumatic rotary joint by regulating the pneumatic control unit and a vibration and speed detection device through the interactive unit, and monitors and displays its leakage and vibration conditions.

[0009] Furthermore, the pneumatic control unit includes a differential pressure sensor and a comparison end and a test end respectively connected to the two ends of the differential pressure sensor, and a protective valve is also connected between the comparison end and the test end; the comparison end is connected to the air inlet end, and the test end is connected to the air inlet end of the pneumatic rotary joint.

[0010] Furthermore, a comparison gas container for storing test gas is provided between the comparison end and the air inlet end, and the air inlet end and the comparison gas container are switched on and off by a first solenoid valve.

[0011] Furthermore, it also includes a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve, wherein the first solenoid valve, the second solenoid valve and the fourth solenoid valve are all two-position two-way solenoid valves, the third solenoid valve is a two-position three-way solenoid valve, and the first solenoid valve, the second solenoid valve and the third solenoid valve are all connected to the intake end via an intake passage;

[0012] The output end of the first solenoid valve is connected to the first channel, and is connected to the comparison gas volume and one end of the protection valve through the first channel; the comparison gas volume is connected to a test end of the differential pressure sensor through the second channel, and the first channel and the second channel are cross-connected through the comparison gas volume;

[0013] The output end of the second solenoid valve is communicated with the output channel and the other test end of the differential pressure sensor, the output channel is communicated with the output end of the pneumatic control unit, one end of the third channel is communicated with the other test end of the differential pressure sensor and the first air inlet of the protection valve, and the output channel is cross-connected with the third channel;

[0014] The output end of the third solenoid valve is connected to the fourth channel, and the fourth channel is connected to the control port of the protection valve for regulating the opening and closing of the protection valve;

[0015] One end of the fourth solenoid valve is connected to the output channel, and the other end is connected to the exhaust channel;

[0016] The differential pressure sensor, comparison gas volume, and first, second, third and fourth solenoid valves are all fixedly arranged on an integrated valve block, and an air intake channel, an output channel, an exhaust channel, a first channel, a second channel, a third channel, a fourth channel, a control port, a first air intake port and a second air intake port are provided in the integrated valve block.

[0017] Furthermore, the air intake unit includes a straight pipe joint that passes through and is fixed on the control box body, one end of the straight pipe joint is connected to the air intake end, and the other end is fixed with a filter pressure reducing valve and a ball valve in sequence; the straight pipe joint and the air intake channel, the output channel and the air intake end are all connected by pipelines.

[0018] Furthermore, a control monitoring panel is also provided on the control box, and the control monitoring panel is composed of a plurality of operation buttons, a plurality of indicator lights for indicating the working status, a driving unit for regulating the operation of the rotating and fixing unit, and a monitoring module for monitoring the leakage and vibration of the pneumatic rotary joint;

[0019] The operation button drives the driving unit and the pneumatic control unit through the interactive unit to complete the test process of the pneumatic rotary joint, and the interactive unit obtains the leakage and beating data of the pneumatic rotary joint and displays them on the monitoring module, and the indicator light is also connected to the signal output end of the interactive unit;

[0020] The interaction unit includes a touch screen and a PLC unit, and the touch screen is electrically connected to the PLC unit.

[0021] Furthermore, the rotating fixing unit includes a servo motor fixedly mounted on the base plate, the servo motor is connected and fixed to the rotating end of the pneumatic rotary joint via a coupling joint, one end of the coupling joint is fixed on the rotating shaft, and the other end is threadedly engaged with the rotating end.

[0022] Furthermore, the vibration detection unit includes a vibration measurement gauge fixedly arranged on the bottom plate, and the top end of the gauge contacts the upper surface of the air inlet end of the pneumatic rotary joint.

[0023] Furthermore, the runout measurement meter is fixed on the base plate by a fixed bracket, the fixed bracket is composed of a first support rod and a second support rod, the second support rod is vertically fixed to the upper surface of the first support rod, and the runout measurement meter is fixedly arranged on one end of the second support rod close to the pneumatic rotary joint.

[0024] Furthermore, a fixing groove is opened along the length direction of the second support rod, and a bolt penetrates the fixing groove to fix the second support rod on the first support rod.

[0025] Compared with the prior art, the beneficial effects of the present invention include:

[0026] 1) After fixing the pneumatic rotary joint to be tested by the rotation fixing unit in the runout and speed detection device, the runout detection unit is used to detect the runout of the pneumatic rotary joint during the test. At the same time, the pneumatic control unit in the test control box is used to complete the inflation, pressure maintenance, detection and deflation processes of the pneumatic rotary joint, and the speed control of the rotation fixing unit is taken into account. Multiple tests of the pneumatic rotary joint can be completed at the same time, and there is no need to disassemble and assemble the pneumatic rotary joint to different test equipment to complete different test processes. The test efficiency of the pneumatic rotary joint can be effectively improved, and the labor and test equipment costs can be reduced;

[0027] 2) The pneumatic control unit installed in the control box is used to control the inflation, pressure maintenance, detection and deflation processes of the pneumatic rotary joint. The operator only needs to connect the pipeline to the air inlet end of the pneumatic rotary joint, and then directly control the test process on the control panel. The leakage amount can be visually observed through the meter on it, which reduces the operating requirements for the operator. In addition, a protection valve is provided in the pneumatic control unit, which can prevent the internal pressure from being too high due to a fault in the pneumatic control unit, and can also use the protection valve to test the leakage amount of the pneumatic rotary joint within the test pressure range, which greatly reduces the test requirements.

[0028] 3) By connecting and fixing the rotating end of the pneumatic rotary joint to the rotating fixing unit, and fixing a vibration detection unit at the other end, the pneumatic rotary joint is supported and fixed by the rotating fixing unit and the supporting unit, and the vibration detection unit is used to complete the vibration detection process of the pneumatic rotary joint. The two rotation and vibration detection processes can be performed simultaneously, which effectively reduces the detection time and improves the detection efficiency of the pneumatic rotary joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0030] Figure 1 The main structure of the pneumatic rotary joint test device is schematically shown;

[0031] Figure 2 The main structure of the first embodiment of the jitter and speed detection device is schematically shown;

[0032] Figure 3 The top view structure of the third embodiment of the runout and speed detection device is schematically shown;

[0033] Figure 4 The schematic diagram shows the internal top view structure of the pneumatic rotary joint test control box;

[0034] Figure 5 The main structure of the pneumatic rotary joint test control box is schematically shown;

[0035] Figure 6 The main structure of the control and monitoring panel is schematically shown;

[0036] Figure 7 The overall distribution structure of the interaction units is schematically shown;

[0037] Figure 8 The top view structure of the pneumatic control unit is schematically shown;

[0038] Fig. 9 The perspective structure of the gas path inside the integrated valve block is schematically shown;

[0039] Fig.10 The test principle diagram of the pneumatic rotary joint test control box is schematically shown.

[0040] Numbers in the figure:

[0041] 1-Jumping and speed detection device;

[0042] 11-rotating fixed unit, 111-servo motor, 112-coupling joint;

[0043] 12-jump detection unit, 121-jump test meter, 122-first support rod, 123-second support rod;

[0044] 13- bottom plate;

[0045] 2-Test control box;

[0046] 21-control box, 211-first instruction indication area, 212-second instruction indication area, 213-operation button, 214-speed controller, 215-input pressure display screen, 216-output pressure display screen, 217-differential pressure detection leakage display screen, 218-servo drive, 219-output connector;

[0047] 22-pneumatic control unit, 221-integrated valve block, 222-differential pressure sensor, 223-protection valve, 224-first solenoid valve, 225-second solenoid valve, 226-third solenoid valve, 227-fourth solenoid valve, 228-comparison gas volume;

[0048] 2211-intake channel, 2212-output channel, 2213-exhaust channel, 2214-first channel, 2215-second channel, 2216-third channel, 2217-fourth channel, 2218-control port, 2219-first air inlet, 2220-second air inlet;

[0049] 23-air inlet unit, 231-straight pipe joint, 232-filter pressure reducing valve, 233-ball valve;

[0050] 24-interactive unit, 241-switching power supply, 242-low ripple power supply, 243-PLC unit, 244 touch screen. DETAILED DESCRIPTION

[0051] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0052] Figure 1 The schematic diagram shows the main structure of the pneumatic rotary joint test device. Figure 1 As shown, it includes a vibration and speed detection device 1 and a test control box 2. After the pneumatic rotary joint to be tested is manually installed on the vibration and speed detection device 1, and the pipeline is connected to the air inlet end of the pneumatic rotary joint, the test control box 2 is used to synchronously complete the relevant detection processes of the vibration, leakage and pressure maintenance of the pneumatic rotary joint. During the process, there is no need to repeatedly disassemble and install the pneumatic rotary joint to complete different test processes, and the test results are completely observed from the meter body on the test control box 2.

[0053] The jitter and speed detection device 1 will be described in detail below.

[0054] The control and detection device includes a rotating fixed unit 11 and a jumping detection unit 12. The rotating end of the pneumatic rotary joint is connected to the rotating fixed unit 11, and the jumping detection unit 12 is fixedly arranged above the other end of the pneumatic rotary joint and in contact with its upper surface, and is used to monitor the jumping condition of the air inlet end of the pneumatic rotary joint.

[0055] Example 1

[0056] Figure 2 The main structure of the first embodiment of the jitter and speed detection device is schematically shown. Figure 2As shown, in this embodiment, the rotation fixing unit 11 includes a servo motor 111 fixedly arranged on the bottom plate 131, and the servo motor 111 drives the rotating end of the pneumatic rotary joint to rotate. The rotating shaft of the servo motor 111 and the rotating end of the pneumatic rotary joint are connected and fixed through a coupling 112. One end of the coupling 112 is fixed on the rotating shaft of the servo motor 111, and the coupling 112 is on the same axis as the rotating shaft of the servo motor 111. The other end of the coupling 112 is fixedly connected to the rotating end. The main shaft is driven to rotate by the servo motor 111, so that the rotating end is driven to rotate by the coupling 112. It is worth mentioning that the coupling 112 and the rotating end are connected and fixed by threaded matching. In this embodiment, the servo motor 111 is lifted by the first fixing member so that the center of the rotating shaft of the servo motor 111 and the center of the rotating end of the pneumatic rotary joint are on the same axis, so that the linear coupling 112 can drive the rotating end.

[0057] Example 2

[0058] Figure 3 The top view of the third embodiment of the jitter and speed detection device is schematically shown. Figure 3 As shown, in this embodiment, on the basis of embodiment 1, the aforementioned runout measurement meter 121 is fixed on the bottom plate 131 through a fixing bracket, the fixing bracket is composed of a first support rod 122 and a second support rod 123, the first support rod 122 is vertically fixed on the bottom plate 131, a fixing groove is provided along the length direction of the second support rod 123, and the second support rod 123 is fixed on the first support rod 122 by bolts penetrating the fixing groove, and the runout measurement meter is fixedly set on one end of the second support rod 123 close to the pneumatic rotary joint. Through the fixing groove provided and the bolt, the position of the runout measurement meter fixed on the second support rod 123 can be adjusted and fixed, so as to provide the possibility for different specifications of pneumatic rotary joints to cooperate with the support unit 2 to complete the test on the rotation runout and speed detection device 1, avoid the need to separately set corresponding detection devices for pneumatic rotary joints of multiple specifications, and effectively reduce the test cost.

[0059] The test control box 2 is described in detail below.

[0060] Figure 4 The schematic diagram shows the internal top view of the pneumatic rotary joint test control box. Figure 5 The schematic diagram shows the main structure of the pneumatic rotary joint test control box. Figure 4-5As shown, the test control box 2 includes a control box body 21, in which a pneumatic control unit 22 is fixedly arranged. The pneumatic control unit 22 is supplied with air by an air intake unit 23 fixed on the control box body 21, and is adjusted and monitored by a control panel fixed on the control box body 21; the aforementioned pneumatic control unit 22 includes a differential pressure sensor 222 and a comparison end and a test end respectively connected to the two ends of the differential pressure sensor 222, and a protective valve 223 is also connected between the comparison end and the test end to ensure that the pressure in the pneumatic control unit 22 is within a safe range.

[0061] Figure 6 The schematic diagram shows the top view of the pneumatic control unit. Figure 7 The schematic diagram shows the perspective structure of the gas path inside the integrated valve block. Figure 6-7 The pneumatic control unit 22 is described. The pneumatic control unit 22 includes an integrated valve block 221, a comparison gas volume 228, a differential pressure sensor 222, a protection valve 223, and a plurality of solenoid valves; a plurality of air passages are provided in the aforementioned integrated valve block 221, the comparison gas volume 228, the differential pressure sensor 222, the protection valve 223, and a plurality of solenoid valves are fixedly arranged on the integrated valve block 221, and the two ends of the differential pressure sensor 222 are respectively connected to the comparison gas volume 228 and the output channel 2212 opened on the integrated valve block 221, the comparison gas volume 228 is used to store the test pressure and output the test pressure to one end of the differential pressure sensor 222, and a plurality of solenoid valves are fixedly arranged on the integrated valve block 221 and are connected to the air passages, and the solenoid valves are used to control the air intake of the comparison gas volume 228 and the opening and closing state of the protection valve 223. The protection valve 223 is a plate-type two-position two-way air-controlled valve, which is in a normally open state and can balance the test pressure at both ends of the differential pressure sensor 222 to protect the differential pressure sensor 222. When it is necessary to perform a pressure-maintaining test on the pneumatic rotary joint under test, the plate-type air-controlled valve can be closed to disconnect the test end and the comparison end of the differential pressure sensor 222. At this time, if the pneumatic rotary joint under test leaks, the pressure at the test end is significantly lower than the pressure at the comparison end, and the pressure-maintaining test can be completed. If no leakage occurs, the test pressures at the test end and the comparison end remain consistent.

[0062] The aforementioned solenoid valve comprises a first solenoid valve 224, a second solenoid valve 225 and a third solenoid valve 226, which are fixedly arranged side by side on the integrated valve block 221. The aforementioned first solenoid valve 224, the second solenoid valve 225 and the fourth solenoid valve 227 are all two-position two-way solenoid valves, and the third solenoid valve 226 is a two-position three-way solenoid valve; the air inlet end of the first solenoid valve 224 is connected to the air inlet channel 2211 provided in the integrated valve block 221, and the output end of the first solenoid valve 224 is connected to the comparison gas volume 228 and one of the air inlets of the protection valve 226 through the first channel 2214 provided in the integrated valve block 221, and at the same time, the second channel 2215 provided on the comparison gas volume 228 and the test end clamp plate is connected to the differential pressure sensor 222 The first channel 2214 is cross-connected through the comparison gas volume 228, the air inlet of the second solenoid valve 225 is connected with the air inlet channel 2211 opened in the integrated valve block 221, and the output port of the second solenoid valve 225 is connected with the output port through the output channel 2212, the output port of the second solenoid valve 225 is connected with the output end of the differential pressure sensor and the other air inlet of the protection valve 226 through the third channel 2216 respectively, the channel 2212 and the third channel 2216 provided in the integrated valve block 221 are cross-connected, the air inlet of the third solenoid valve 226 is connected with the air inlet channel 2211 opened in the integrated valve block 221, the output port of the third solenoid valve 226 is connected with the fourth channel 2217 opened in the integrated valve block 221 and the control port 2218 of the protection valve 226, which is used for opening and closing the protection valve 226. The aforementioned first solenoid valve 224, second solenoid valve 225 and third solenoid valve 226 are arranged in sequence on the integrated valve block 221, and the intake channel 2211 is based on the width direction of the integrated valve block 221, and the intake channel 2211 is connected to the first solenoid valve 224, the second solenoid valve 225 and the third solenoid valve 226 at the same time, that is, the intake channel 2211 can simultaneously supply test pressure to the first solenoid valve 224, the second solenoid valve 225 and the third solenoid valve 226, and then determine their directions according to their respective opening and closing, thereby completing the relevant transportation or control process.

[0063] It is worth noting that a fourth solenoid valve 227 is also included. The fourth solenoid valve 227 is arranged in sequence on one side of the third solenoid valve 226. One end of the fourth solenoid valve 227 is connected to the output channel 2212, and the other end of the fourth solenoid valve 227 is connected to the exhaust channel 2213. The aforementioned output channel 2212 and exhaust channel 2213 are both opened based on the length direction of the integrated valve block 221.

[0064] The output end of the first solenoid valve 224 is connected to the comparison gas volume 228, and the end of the differential pressure sensor 222 close to the comparison gas volume 228 is the comparison end, and the comparison test pressure is provided by the comparison gas volume 228. The comparison gas volume 228 and the differential pressure sensor 222 are connected and penetrated by a combination pad, and the aforementioned combination pad is fixed to the comparison end of the differential pressure sensor 222 by a through-plate screw, and the comparison end is connected to the second channel 2215 by a clamping plate. The end of the differential pressure sensor 222 connected to the output channel 2212 is the test end, and the test end is connected to the third channel 2216 of the gas path channel by a clamping plate, and the aforementioned clamping plate is fixed to the test end of the differential pressure sensor 222 by a through-plate screw.

[0065] The protection valve 223, namely the plate-type gas-controlled valve, is described in detail below. The plate-type air-controlled valve includes a valve core movably arranged in a valve cavity, and a control port 2218, a first air inlet 2219 and a second air inlet 2220 are respectively provided in the length direction of the valve cavity. The position switching of the valve core in the valve cavity is completed by inputting control compressed air into the control port 2218 provided on the protection valve 223, wherein the control port 2218 of the protection valve 223 is connected with the output port of the third solenoid valve 226 for regulating its on-off, and the first air inlet 2219 of the protection valve 223 is simultaneously connected with the output port of the second solenoid valve 225 and the test end of the differential pressure sensor 222, and the second air inlet 2220 of the protection valve 223 is connected with the comparison gas volume 228 through an air path channel provided in the integrated valve block 221, and the first air inlet 2219 and the second air inlet 2220 of the protection valve 223, i.e., the plate-type air-controlled valve, are supplied with air through the provided air path channel to keep it in a normally open state. A control port 2218 is provided in the thickness direction of the valve cavity. The output end of the second solenoid valve 225 is connected to the control port 2218 , and the control compressed air is supplied to the interior of the protection valve 223 through the control port 2218 . In actual use, when the protection valve 223, i.e., the plate-type air-controlled valve, is in a normally open state, the valve core in the valve cavity is in a position close to the control port 2218, and at this time, the third solenoid valve 226 is in a closed state. After the test pressure is sent in through the second air inlet 2220 by means of the comparison air volume 228, since there is no compressed air in the control port 2218, the first and second air inlets 2220 are connected, so that the test end of the differential pressure sensor 222 and the comparison end of the differential pressure sensor 222 are also connected, and the pressure is completely consistent with the test end; and when the third solenoid valve 226 is in an open state, compressed air flows from the output port of the third solenoid valve 226 into the protection valve 223, i.e., the control port 2218 of the plate-type air-controlled valve, the valve core in the protection valve 223 moves to the right, and the first air inlet 2219 and the second air inlet are in a cut-off state, so that the comparison end and the test end of the differential pressure sensor 222 are in a cut-off state, and the leakage detection of the test piece can be completed at this time.

[0066] The following is a detailed description of the air intake unit 23. The air intake unit 23 is fixedly arranged on the side of the control box 21, and includes a straight pipe joint 231, a filter pressure reducing valve 232 and a ball valve 233. The straight pipe joint 231 penetrates the thickness direction of the control box 21 and is connected to the filter pressure reducing valve 232 located outside the control box 21. The other end of the filter pressure reducing valve 232 is connected to a ball valve 233. The ball valve 233 is used to regulate the opening and closing of the air intake unit 23, and the filter pressure reducing valve 232 is used to regulate the air pressure of the input test gas. Then, the air intake process of the test gas is completed through the pipe body plugged into the input port of the air intake channel 2211 and the straight pipe joint 231.

[0067] The control monitoring panel is described in detail below. A number of operation buttons 213 and a first instruction indication area 211 and a second instruction indication area 212 corresponding to the operation buttons 213 are arranged on the control monitoring panel (the aforementioned first instruction indication area 211 and the second instruction indication area 212 are both indicator lights), which are used to indicate the control status of some operation buttons 213. The aforementioned operation buttons 213 include an emergency stop button, a power button, a manual / automatic adjustment knob, a forward / reverse adjustment knob, a start button, an inflation button, a pressure-maintaining button, a detection button, and a deflation button. The first instruction indication area 211 includes a power indicator light, a start indicator light, a forward indicator light, and a reverse indicator light. For example, after the power button is turned on and pressed, the power indicator light in the first instruction indication area 211 lights up, when the manual / automatic adjustment knob is adjusted to the automatic state, when the start button is pressed, the start indicator light is on, and the start-related function detection is completed by the PLC unit 243, and when the manual / automatic adjustment knob is adjusted to the manual state, the related function detection is completed by the forward / reverse adjustment knob, the inflation button, the pressure-maintaining button, the detection button and the deflation button through manual control. Regardless of whether it is detected in manual or automatic state, if an accident (including a dangerous state) occurs, the emergency stop button is pressed, and the pneumatic rotary joint under test should be stopped and deflated immediately. The forward indicator light and the reverse indicator light are used to indicate the control state of the forward / reverse adjustment knob. It is worth noting that the aforementioned manual / automatic adjustment knob, forward / reverse adjustment knob and start button are all used to control the action of the servo motor. A drive unit (including a speed controller 214 and a servo driver 218) is also provided on the control monitoring panel. Based on the aforementioned knobs or buttons in conjunction with the speed controller 214, the servo controller controls the direction and speed of the servo motor. The second instruction indication area 212 includes an inflation indicator light, a pressure-maintaining indicator light, a detection indicator light and a deflation indicator light. When the inflation button, the pressure-maintaining button, the detection button and the deflation button are pressed respectively, the aforementioned inflation indicator light, the pressure-maintaining indicator light, the detection indicator light and the deflation indicator light will light up accordingly to indicate the current air path test process for the pneumatic rotary joint. A monitoring module (including an input pressure display screen 215, an output pressure display screen 216 and a differential pressure detection leakage display screen 217) is also provided on the control monitoring panel. During the air circuit test of the pneumatic rotary joint, the test pressure of the input pneumatic control unit and the test pressure of the output pneumatic control unit are displayed, and the reading of the differential pressure sensor in the pneumatic control unit is displayed in real time. The output connector 219 for outputting the test pressure for the pneumatic control unit is also fixedly provided on the control monitoring panel.

[0068] An interactive unit 24 (i.e., an electrical installation board) is also provided in the control box 21. The electrical installation board includes a switching power supply 241, a low ripple power supply 242, a PLC unit 243, a touch screen 244, and a number of wiring grooves. The aforementioned switching power supply 241 is used to power the control box and assist in completing the control process of the pneumatic control unit. A power interface and an encoder are provided on the servo motor. The aforementioned low ripple power supply 242 is used to power the differential pressure sensor 222. The speed controller 214 located on the control monitoring panel and the signal output end of the related buttons or knobs are connected to the PLC unit 243. The PLC unit 243 cooperates with the servo driver 218 to accurately control the speed and direction of the servo motor with the help of the encoder provided on the servo motor. Due to the presence of the encoder, the number of rotations of the servo motor can be accurately controlled. The aforementioned PLC unit 243 is also used in the air circuit test process of the pneumatic rotary joint. The first solenoid valve, the second solenoid valve, the third solenoid valve, and the fourth solenoid valve located in the pneumatic control unit are all regulated by the PLC unit 243 to open and close. When the corresponding inflation button is pressed on the control monitoring panel, the PLC unit 243 can adjust the opening and closing state of the relevant solenoid valve to assist in completing the inflation process. The wiring trough provided on the electrical installation board can help ensure that the structure inside the control box is clear, and can avoid interference from the complicated internal wiring harness during the wiring process, the takeover process and the subsequent maintenance process.

[0069] The following is a detailed description of the test process of the pneumatic rotary joint test device. As shown on the control monitoring panel, the test process includes the inflation process, the pressure maintenance process, the detection process and the deflation process. Fig.10 , 1DT shown is the first solenoid valve, 2DT is the second solenoid valve, 3DT is the third solenoid valve, and 4DT is the fourth solenoid valve.

[0070] Inflation process

[0071] During the inflation process, 1DT and 2DT are in the open state, 3DT is closed and does not move, the plate-type air control valve is in the normally open state, and 4DT is in the closed state. The test pressure is input into the pneumatic rotary joint through 1DT and the plate-type air control valve to complete the inflation process.

[0072] Pressure holding process

[0073] During this process, 1DT and 2DT are opened to complete the inflation process and then closed, and the vibration detection unit continues the rotation process.

[0074] Leakage detection process

[0075] During this process, 1DT is in the closed state, 2DT is opened and then restored to the closed state, and then 3DT is opened to close the plate-type air-controlled valve. During the detection process, the jump detection unit keeps rotating. After 3 to 5 seconds, the digital-to-analog conversion module in the PLC unit receives the pressure difference signal from the differential pressure sensor, and displays the measured leakage amount on the touch screen after calculation.

[0076] Deflation process

[0077] During this process, 1DT and 2DT are in the closed state, and 3DT and 4DT are opened to complete the deflation process.

[0078] The following is a detailed description of the constant pressure durability test process, pulse test process and temperature rise test process.

[0079] Constant pressure durability test process

[0080] In this process, open 1DT, 2DT and close 3DT, 4DT, complete the inflation process of the pneumatic rotary joint under the state of the plate-type air control valve being normally open, and then close 1DT, 2DT and keep rotating at a certain speed with the jump and speed detection device 1 until the time specified by the constant pressure durability test, during which the manual air replenishment process can be mixed. That is, the inflation process is mixed on the basis of the pressure holding process to complete the constant pressure durability test.

[0081] Pulse durability test process

[0082] In this process, 3DT is in a normally closed state, and the plate-type gas control valve is in a normally open state. 1DT and 2DT are regulated to open to complete the inflation process. At this time, 4DT is in a closed state. Then 1DT and 2DT are closed and 4DT is opened to complete the deflation process. The opening and closing processes of 1DT, 2DT and 4DT are cycled to form a cyclic inflation and deflation pulse. The cycle interval is several seconds. In this process, the beating and speed detection device 1 keeps rotating to observe the leakage on the control monitoring panel. That is, the inflation process and deflation process are cycled at fixed time intervals.

[0083] Temperature rise test process

[0084] On the basis of the aforementioned pressure-maintaining process or detection process, a temperature detection device is arranged at the sealing ring of the pneumatic rotary joint. After the compressed air with the highest working pressure is introduced into the pneumatic rotary joint to be tested and the highest speed is maintained for a certain period of time, such as 4 hours, the obtained temperature data is subtracted from the room temperature to obtain the temperature rise data.

[0085] The maximum speed test, leakage test, constant pressure durability test, and pulse durability test can all be set and controlled through the touch screen 244 and the PLC unit 243 electrically connected thereto.

[0086] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A pneumatic rotary joint test device, characterized in that: include: A runout and speed detection device (1) comprises a rotation fixing unit (11) and a runout detection unit (12), wherein the rotation end of a pneumatic rotary joint is connected to the rotation fixing unit (11), and the rotation fixing unit (11) drives the rotation end of the pneumatic rotary joint to complete the rotation process, and the runout detection unit (12) is fixedly arranged above the other end of the pneumatic rotary joint and contacts with its upper surface, and is used to test the runout of the pneumatic rotary joint; A test control box (2) comprises a control box (21), in which a pneumatic control unit (22) and an interaction unit (24) are fixedly arranged. The pneumatic control unit is supplied with air by an air intake unit (23) fixed on the control box (21) and supplies air to an air intake end of a pneumatic rotary joint. A control monitoring panel is fixedly arranged on the control box (21). The control monitoring panel controls the pneumatic control unit and a vibration and speed detection device through the interaction unit (24) to complete a test process for the pneumatic rotary joint, and monitors and displays its leakage and vibration conditions.

2. The pneumatic rotary joint testing device according to claim 1, characterized in that: The pneumatic control unit (22) comprises a differential pressure sensor (222) and a comparison end and a test end respectively connected to two ends of the differential pressure sensor (222), and a protection valve (223) is also connected between the comparison end and the test end; the comparison end is connected to the air inlet end, and the test end is connected to the air inlet end of the pneumatic rotary joint.

3. The pneumatic rotary joint testing device according to claim 2, characterized in that: A comparison gas container (228) for storing test gas is provided between the comparison end and the air inlet end, and the first solenoid valve (224) is used to regulate the on-off between the air inlet end and the comparison gas container (228).

4. The pneumatic rotary joint testing device according to claim 3, characterized in that: The device further comprises a first solenoid valve (224), a second solenoid valve (225), a third solenoid valve (226) and a fourth solenoid valve (227); the first solenoid valve (224), the second solenoid valve (225) and the fourth solenoid valve (227) are all two-position two-way solenoid valves; the third solenoid valve (226) is a two-position three-way solenoid valve; and the first solenoid valve (224), the second solenoid valve (225) and the third solenoid valve (226) are all connected to the air intake end via the air intake passage (2211); The output end of the first solenoid valve (224) is in communication with the first channel (2214), and is simultaneously in communication with the comparison gas volume (228) and one end of the protection valve (223) via the first channel (2214); the comparison gas volume (228) is in communication with the comparison end of the differential pressure sensor (222) via the second channel (2215), and the first channel (2214) and the second channel (2215) are cross-connected via the comparison gas volume (228); The output end of the second solenoid valve (225) is communicated with the output channel (2212) and the other test end of the differential pressure sensor (222), the output channel (2212) is communicated with the output end of the pneumatic control unit (22), one end of the third channel (2216) is communicated with the test end of the differential pressure sensor (222) and the first air inlet (2219) of the protection valve (223), and the output channel (2212) and the third channel (2216) are cross-connected; The output end of the third solenoid valve (226) is in communication with a fourth channel (2217), and the fourth channel (2217) is in communication with a control port (2218) of the protection valve (223) for regulating the opening and closing of the protection valve (223); One end of the fourth solenoid valve (227) is in communication with the output channel (2212), and the other end is in communication with the exhaust channel (2213); The differential pressure sensor (222), the comparison gas volume (228), the first solenoid valve (224), the second solenoid valve (225), the third solenoid valve (226), and the fourth solenoid valve (227) are all fixedly arranged on the integrated valve block (221), and the integrated valve block (221) is provided with an intake channel (2211), an output channel (2212), an exhaust channel (2213), a first channel (2214), a second channel (2215), a third channel (2216), a fourth channel (2217), a control port (2218), a first air inlet (2219), and a second air inlet (2220).

5. The pneumatic rotary joint testing device according to claim 2, characterized in that: The air intake unit (23) comprises a straight pipe joint (231) that penetrates and is fixed on the control box (21); one end of the straight pipe joint (231) is connected to the air intake end, and the other end is fixed with a filter pressure reducing valve (232) and a ball valve (233) in sequence; the straight pipe joint (231) and the air intake channel (2211), and the output channel (2212) and the air intake end are all connected by pipelines.

6. The pneumatic rotary joint testing device according to claim 1, characterized in that: A control monitoring panel is also provided on the control box (21), and the control monitoring panel is composed of a plurality of operation buttons, a plurality of indicator lights for indicating the working status, a drive unit for regulating the operation of the rotating and fixing unit (11), and a monitoring module for monitoring the leakage and vibration of the pneumatic rotary joint; The operation button drives the driving unit and the pneumatic control unit (22) via the interactive unit (24) to complete the testing process of the pneumatic rotary joint, and the interactive unit (24) obtains the leakage and vibration data of the pneumatic rotary joint and displays them on the monitoring module, and the indicator light is also connected to the signal output end of the interactive unit (24); The interactive unit (24) comprises a touch screen (244) and a PLC unit (243), and the touch screen (244) is electrically connected to the PLC unit (243).

7. The pneumatic rotary joint testing device according to claim 1, characterized in that: The rotating fixing unit (11) comprises a servo motor (111) fixedly arranged on the base plate (13); the servo motor (111) is connected and fixed to the rotating end of the pneumatic rotary joint via a coupling joint (112); one end of the coupling joint (112) is fixed on the rotating shaft, and the other end is threadedly engaged with the rotating end.

8. The pneumatic rotary joint testing device according to claim 1, characterized in that: The vibration detection unit (12) comprises a vibration measurement gauge (121) fixedly arranged on the bottom plate (13), the top end of which contacts the upper surface of the air inlet end of the pneumatic rotary joint.

9. The pneumatic rotary joint testing device according to claim 8, characterized in that: The runout measurement gauge (121) is fixed on the base plate (13) by a fixed bracket, the fixed bracket is composed of a first support rod (122) and a second support rod (123), the second support rod (123) is vertically fixed to the upper surface of the first support rod (122), and the runout measurement gauge is fixedly arranged on one end of the second support rod (123) close to the pneumatic rotary joint.

10. The pneumatic rotary joint testing device according to claim 9, characterized in that: A fixing groove is provided along the length direction of the second support rod (123), and a bolt penetrates the fixing groove to fix the second support rod (123) on the first support rod (122).

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