Integrated airtightness testing and quantitative oil injection device and its usage method

Abstract

This invention discloses an integrated airtightness testing and quantitative oil injection device and its usage method. The device includes a frame, on which are mounted a mandrel clamping assembly, an airtightness testing assembly, an oil injection assembly, a vacuuming assembly, and a control system. The mandrel clamping assembly includes a cylinder and a mandrel, with the free end of the piston rod at the lower end of the cylinder connected to the upper part of the mandrel. The mandrel includes a column, within which vertical gas channels and liquid channels are spaced apart. The gas channels form inlet and outlet holes on the lower end face of the column, and the liquid channels form oil injection holes on the lower end face of the column. The lower end face of the column is a stepped surface. A first threaded hole and a second threaded hole are formed downwardly inclined from the outer periphery to the inner side of the middle of the column. The inner side of the first threaded hole communicates with the gas channel, and the inner side of the second threaded hole communicates with the liquid channel. This invention is a special tooling for processing vehicle chassis load-bearing wheels, realizing integrated and automated airtightness and oil injection operations.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing, and relates to a structure improvement of an air tightness detection tool for a chassis load wheel of a vehicle, in particular to an integrated air tightness detection and quantitative oil injection device and a use method thereof. BACKGROUND

[0002] The chassis load wheel of a vehicle is a key component of the vehicle, and the load wheel is a support base of the chassis of the vehicle and thus directly bears various loads transmitted by the vehicle and the road surface. In terms of structure, the load wheel is mainly composed of a vehicle bearing and a wheel hub. In order to ensure the normal use of the load wheel, a certain amount of lubricating oil needs to be added to the internal oil cavity of the load wheel to maintain the operation of the vehicle bearing. Therefore, after the chassis load wheel of the vehicle is processed, air tightness detection and oil injection operations need to be performed on the internal cavity of the load wheel.

[0003] At present, the existing air tightness detection and oil injection operation mode is manually operated, compressed air is manually injected for leakage test, and a syringe is used to inject lubricating oil into the oil cavity of the part. The operation standard is as follows:

[0004] Firstly, compressed air is injected, and pressure is maintained for 30 seconds to check whether there is leakage.

[0005] Then, 55ml of lubricating oil is injected into the oil port of the part by using a syringe, and the oil flows into the oil cavity through the oil hole of the workpiece and the gap of the bearing in about 3 minutes.

[0006] In the existing operation process, a large number of personnel are required, and the process time is too long. Moreover, due to the uncontrollability of manual operation, the quality of the product, such as air tightness and oil injection amount, cannot be guaranteed by manual operation, and the product precision and quality required by the customer cannot be achieved. Therefore, it is necessary to develop a special integrated air tightness detection and oil injection tool for the chassis load wheel of the vehicle, which can realize automatic operation. SUMMARY

[0007] The purpose of the present application is to provide an integrated air tightness detection and quantitative oil injection device and a use method thereof, which are used to solve the problems of the existing air tightness detection and oil injection operation for the chassis load wheel of the vehicle, such as a large number of personnel required, a large number of processes, a long time, a low work efficiency, and the like, and cannot effectively guarantee the quality of the product.

[0008] In order to achieve the purpose of the present application, the following technical solutions are adopted:

[0009] The integrated air tightness detection and quantitative oil injection device comprises a rack, a head pressing assembly, an air tightness detection assembly, an oil injection assembly, a vacuum pumping assembly and a control system which are mounted on the rack; the head pressing assembly comprises a cylinder and a head, the upper end of the cylinder is fixed on the rack, the free end of the piston rod at the lower end of the cylinder is connected with the upper part of the head, and the head is lifted and lowered by the cylinder; the head comprises a column body, vertical gas passages and liquid passages are arranged in the column body at intervals, the gas passages form gas inlet and outlet holes on the lower end face of the column body, the liquid passages form oil injection holes on the lower end face of the column body, the lower end face of the column body is a stepped face, the height of the stepped face at the position of the oil injection holes is lower than the height of the stepped face at the position of the gas inlet and outlet holes, a first wire hole and a second wire hole are formed in the middle part of the column body from the outer circumferential surface to the inner side and are inclined downward, the inner side of the first wire hole is in communication with the gas passages, and the inner side of the second wire hole is in communication with the liquid passages; the air charging port of the air tightness detection assembly and the air inlet port of the vacuum pumping assembly are respectively in sealed communication with the first wire hole through gas conveying pipes, the oil supply port of the oil injection assembly is in communication with the second wire hole through an oil conveying pipe, the air tightness detection assembly is used for charging air into the inner cavity of a workpiece through the gas inlet and outlet holes and maintaining pressure to perform air tightness detection when the head is connected with the oil hole of the workpiece, the vacuum pumping assembly is used for pumping the inner cavity of the workpiece through the gas inlet and outlet holes after air tightness detection of the workpiece, and the oil injection assembly is used for sucking lubricating oil into the inner cavity of the workpiece through the oil injection holes by pressure difference after vacuum pumping.

[0010] In order to further achieve the purpose of the application, the following technical solutions can also be used:

[0011] The column body comprises a middle thick cylindrical segment and a lower thin cylindrical segment which are coaxially arranged, and a funnel-shaped transition segment is arranged at the connecting end of the thick cylindrical segment and the thin cylindrical segment, and the diameter of the thick cylindrical segment is 3-6 times the diameter of the thin cylindrical segment.

[0012] The lower end face of the column body is a stepped face formed by two same semicircles, and a sealing rubber ring is sleeved on the outer periphery of the lower end face of the column body; and a connecting part with a plurality of through holes is arranged on the upper end of the column body.

[0013] The first wire hole is located above the second wire hole, and the first wire hole and the second wire hole are staggered on the cross section of the column body; the cross sectional areas of the gas passages and the liquid passages are the same; the upper end of the gas passage is in communication with the inner side of the first wire hole, and the upper end of the liquid passage is in communication with the inner side of the second wire hole.

[0014] The integrated air tightness detection and quantitative oil injection device, the air tightness detection assembly includes a pressure reducing valve, a first pressure sensor, an inflation solenoid valve, a first stop solenoid valve and a gas supply pipe for connection, the first wire hole is communicated with an external gas source through the gas supply pipe, the gas supply pipe is sequentially provided with the pressure reducing valve, the first pressure sensor, the inflation solenoid valve and the first stop solenoid valve, the first pressure sensor is used for monitoring the pressure of the gas supply pipe during inflation and pressure maintaining, the inflation solenoid valve is used for opening during inflation and closing during pressure maintaining, and the working pressure range of the inflation solenoid valve is 0-137.9 kPa, and the first stop solenoid valve is used for closing the gas supply pipe after the workpiece inner cavity is inflated and pressure maintained.

[0015] The integrated air tightness detection and quantitative oil injection device, the oil injection assembly includes a quantitative oil cup, an oil level detection sensor and an oil valve, the oil inlet of the quantitative oil cup is connected with an external electric oil pump and an oil tank through an oil supply pipe in sequence, the oil level detection sensor is fixed on the upper portion of the quantitative oil cup through bolts, the oil level detection sensor is used for detecting the oil level of the quantitative oil cup and stopping oil injection after being filled, one end of the oil valve is communicated with the oil outlet of the quantitative oil cup, and the other end of the oil valve is connected with the second wire hole through the oil supply pipe as an oil supply port.

[0016] The integrated air tightness detection and quantitative oil injection device, the quantitative oil cup includes an oil cup, an oil cup outer sleeve, an oil amount adjusting sleeve and a cup cover, the oil cup and the oil amount adjusting sleeve are installed in the oil cup outer sleeve, the oil amount adjusting sleeve is installed in the outer periphery of the upper portion of the oil cup in reverse, and the cup cover is installed at the upper end of the oil cup outer sleeve, the oil cup is a cylindrical structure with an open upper end, the bottom of the oil cup is provided with an oil outlet, the oil amount adjusting sleeve is installed on the outer periphery of the upper portion of the oil cup, the outer periphery of the lower portion of the oil cup is provided with an oil return groove, and a vertical groove is formed in the upper portion of the oil cup, an inclined groove is formed in the oil amount adjusting sleeve, a sealing ring is installed between the oil cup and the oil amount adjusting sleeve, and the sealing ring is located below the vertical groove and the inclined groove, a threaded hole and a through hole are formed in the top plate of the oil amount adjusting sleeve, the threaded hole is connected with the cup cover through an adjusting screw, and the through hole is used as the oil inlet of the quantitative oil cup, and the bottom of the oil return groove is provided with a drain port, and the drain port is connected with an external oil tank through an oil pipe.

[0017] The integrated air tightness detection and quantitative oil injection device, the vacuum pumping assembly includes a vacuum pump, a second stop solenoid valve, a second pressure sensor and a one-way valve, the air inlet of the vacuum pump is communicated with the first wire hole through a gas extraction pipe, the second stop solenoid valve, the second pressure sensor and the one-way valve are installed on the gas extraction pipe, the second pressure sensor is used for detecting the pressure of the gas extraction pipe during vacuumizing of the workpiece inner cavity, and the second stop solenoid valve is used for closing the gas extraction pipe during inflation, pressure maintaining and oil injection of the workpiece inner cavity.

[0018] The control system comprises a PLC programmable controller, a relay module, an input module, and a control power supply, the input module is used for inputting the collected pressure signals of the air tightness detection assembly, the oil injection assembly, the vacuum pumping assembly, and the inner cavity of the workpiece to the PLC programmable controller, and the PLC programmable controller outputs signals to the relay module, so as to control the starting or stopping of the air cylinder, the air tightness detection assembly, the oil injection assembly, and the vacuum pumping assembly.

[0019] The application further discloses a use method of the integrated air tightness detection and quantitative oil injection device.

[0020] S1, the air cylinder of the top head pressing assembly drives the top head to descend and connect with the oil hole of the workpiece;

[0021] S2, the air tightness detection assembly works to perform inflation and air tightness detection, the inner cavity of the workpiece is inflated to 20 PSI through the air inlet and outlet hole of the top head, and then the pressure is maintained for 30 seconds; the pressure sensor monitors whether the inner cavity pressure of the workpiece is between 124.11-137.9 kPa, if yes, the next step is entered, otherwise, the workpiece is determined to be unqualified;

[0022] S3, the vacuum pumping assembly works to perform air pumping, the inner cavity of the workpiece is pumped to 70 Pa through the air inlet and outlet hole of the top head, and then the top head is closed;

[0023] S4, the oil injection assembly works to perform oil injection, the inner cavity of the workpiece is filled with the lubricating oil in the quantitative oil cup to the oil cavity of the workpiece through the oil injection hole of the top head;

[0024] S5, after the oil injection assembly is closed to the set oil injection time, the air cylinder of the top head pressing assembly works to drive the top head to ascend and separate from the workpiece.

[0025] The application has the following advantages:

[0026] The application is a special tool for detecting and injecting oil for a workpiece of a chassis load wheel of a vehicle, realizes integrated air tightness and oil injection operation, and the top head pressing assembly adopts a double-channel structure, so that the inflation, air pumping and oil injection do not affect each other.

[0027] The application is convenient to operate and maintain, the top head pressing assembly, the air tightness detection assembly, the oil injection assembly, the vacuum pumping assembly and the control system can realize automatic operation, solve the problems of too many personnel, too many processes, too long process time and unguaranteed product quality in the existing work operation mode, greatly improve the work efficiency and reduce the manual operation error, effectively improve the production efficiency and realize large-scale automatic production, and reduce the labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings required to be used in the embodiments or prior art description will be briefly introduced.

[0029] Figure 1 is a perspective view of the present application;

[0030] Figure 2 is a front view of the present application (the right protective cover is removed in the drawing); Figure 1

[0031] Figure 3 is a perspective view of the cylinder described in the present application; Figure 1

[0032] Figure 4 is a left side view of the present application; Figure 3

[0033] Figure 5 is an A-A sectional view of the present application; Figure 4

[0034] Figure 6 is a perspective view of the oil measuring cup described in the present application; Figure 1

[0035] Figure 7 is a schematic view of the internal structure of the present application; Figure 6

[0036] Figure 8 is a schematic view of the structure of the oil cup described in the present application; Figure 7

[0037] Figure 9 is a perspective view of the oil cup described in the present application; Figure 7

[0038] Figure 10 is a perspective view of the outer sleeve of the oil cup described in the present application; Figure 7

[0039] Figure 11 is a schematic view of the structure of the oil amount adjusting sleeve described in the present application; Figure 7

[0040] Figure 12 is a perspective view of the oil amount adjusting sleeve. Figure 7

[0041] Reference signs:

[0042] ​​​​​​​​​​​1-Workbench, 2-Column, 3-Support plate, 4-Cylinder, 5-Car chassis load-bearing wheel workpiece, 6-Column body, 61-Connecting part, 62-Rough cylindrical section, 63-Transition section, 64-Slim cylindrical section, 65-First threaded hole, 66-Second threaded hole, 67-Gas passage, 68-Liquid passage, 69-Air inlet / outlet, 70-Oil filling hole, 7-Metering oil cup, 71-Oil cup, 711-Oil outlet, 712-Vertical groove, 713-Return Oil tank, 714-oil drain port, 72-oil cup outer fixed sleeve, 73-oil quantity adjustment sleeve, 731-tilting groove, 732-threaded hole, 733-through hole, 74-cup cover, 75-adjusting screw, 76-sealing ring, 8-inflation solenoid valve, 9-first shut-off solenoid valve, 10-second shut-off solenoid valve, 11-oil cup solenoid valve, 13-inflation pressure reducing valve, 14-cylinder pressure reducing valve, 15-first pressure sensor, 16-second pressure sensor. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0044] In the description of the embodiments of this invention, unless otherwise explicitly limited, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0045] like Figure 1 , Figure 2 As shown, the integrated airtightness testing and quantitative oil injection device disclosed in this embodiment is a special tooling for vehicle chassis load-bearing wheels. Structurally, the device consists of a frame, a top clamping assembly, an airtightness testing assembly, an oil injection assembly, a vacuuming assembly, and a control system.

[0046] The frame serves as the mounting bracket and support base for other components, including a worktable 1 made of a base plate, a column 2, a bracket plate 3, an oil cup 71 fixing plate, a valve body bracket, a sensor bracket, and other components. The worktable 1 serves as the positioning and working platform for the vehicle chassis load-bearing wheel workpiece 5. The lower end of the column 2 is vertically fixed to the worktable 1, and the upper part of the column 2 is used to install the aforementioned brackets and components.

[0047] like Figure 1 , Figures 3-5 As shown, the mandrel clamping assembly in this embodiment mainly consists of a mandrel and a cylinder 4. The mandrel is installed below the cylinder 4, and the free end of the piston rod of the cylinder 4 is fixedly connected to the upper end of the mandrel. The cylinder 4 is used to drive the mandrel to move up and down.

[0048] When the cylinder 4 works, it pushes the piston rod to move, and the piston rod drives the top head to move up and down. The cylinder 4 is vertically installed on the support plate 3, that is, the upper end of the cylinder 4 is fixed with the support plate 3, or the cylinder 4 is connected with the support plate 3 through the cylinder 4 seat, and one end of the support plate 3 is vertically fixed on one side of the upper part of the stand column 2. Since the top head is located above the workbench 1, after the vehicle chassis load wheel workpiece 5 is placed on the workbench 1 and positioned, the top head is driven to descend by the cylinder 4, and the lower end surface thereof can be connected with the oil hole of the vehicle chassis load wheel workpiece 5.

[0049] Then, according to the set operation steps, the control system starts the airtightness detection assembly, the oil injection assembly, and the vacuum pumping assembly to sequentially perform corresponding airtightness detection and oil injection operations. After completion, the cylinder 4 drives the top head to rise and lift, and the vehicle chassis load wheel workpiece 5 can be removed from the workbench 1 and moved away for detection of the next workpiece.

[0050] As shown in Figure 3 , in order to facilitate the connection of the piston rod of the cylinder 4 with the column body 6, a connection part 6261 with a plurality of through holes 733 is arranged at the upper end of the column body 6. The connection part 6261 is similar to a flange, and thus a corresponding specified flange can be directly welded with the column body 6. A corresponding flange is arranged on the free end of the piston rod of the cylinder 4, and the two are fixedly connected through bolts.

[0051] The top head of the embodiment is an irregular circular column body 6, as shown in Figures 3-5 , and vertical gas passages 67 and liquid passages 68 are arranged at intervals on the inner side of the column body 6. The outlet of the gas passage 67 at the lower end surface of the column body 6 serves as an air inlet and outlet hole 69, and the outlet of the liquid passage 68 at the lower end surface of the column body 6 serves as an oil injection hole 70.

[0052] At the same time, in order to facilitate operation and accurately control the flow and time of the gas or liquid medium, the circular cross-sectional areas of the gas passage 67 and the liquid passage 68 are set to be the same in the embodiment.

[0053] Continuing to refer to Figure 3 , Figure 5 , the column body 6 is provided with a first inclined thread hole 65 and a second thread hole 66 from the outer periphery to the inner side in the middle part, and the first thread hole 65 and the second thread hole 66 are inclined downward from the outside to the inside. The inner side of the first thread hole 65 is in communication with the gas passage 67, and the inner side of the second thread hole 66 is in communication with the liquid passage 68, and the first thread hole 65 is located above the second thread hole 66.

[0054] In order to increase the structural strength of the column body 6, the column body 6 is divided into coaxial upper, middle and lower parts, the middle part is a thick cylindrical segment, and the lower part is a thin cylindrical segment 64. A funnel-shaped transition segment 63 is arranged at the connection end of the thick cylindrical segment and the thin cylindrical segment 64, and the diameter of the thick cylindrical segment is 3-6 times the diameter of the thin cylindrical segment 64.

[0055] The first wire hole 65 and the second wire hole 66 are staggered on the transverse section of the column 6. The upper end of the gas passage 67 is in communication with the inner side of the first wire hole 65, and the upper end of the liquid passage 68 is in communication with the inner side of the second wire hole 66.

[0056] Continuing to refer to Figure 5 As shown, the lower end surface of the column 6 is provided as a stepped surface, and the stepped surface at the position of the oil injection hole 70 is lower than the stepped surface at the position of the gas inlet and outlet hole 69. The lower end surface of the column 6 in this embodiment is a stepped surface composed of two identical semicircles. In addition, a soft sealing rubber ring is fixed around the lower end of the top head, which plays a sealing role when the top head is connected to the oil hole of the workpiece 5 of the vehicle chassis load-bearing wheel.

[0057] The top head pressing assembly disclosed in this embodiment can drive the movement of the top head by the up-and-down movement of the cylinder 4 controlled by the electromagnetic valve, and the lifting and loosening and the lowering and pressing of the top head can be driven by the up-and-down movement of the cylinder 4 controlled by the electromagnetic valve. The main function of the top head is to inflate, vacuumize and inject oil into the bearing cavity of the workpiece 5 of the vehicle chassis load-bearing wheel, and at the same time, an integrated structure for the above operations is realized, which, in combination with the air tightness detection assembly, the oil injection assembly and the vacuumizing assembly, can realize automatic operation.

[0058] The top head is provided with a double-channel and double-outlet structure in structure, which can avoid mutual interference of gas transmission and oil injection. The gas inlet and outlet hole 69 and the oil injection hole 70 are provided in a state of inconsistent height to prevent oil return after oil injection through the gas inlet and outlet hole 69. The inclined first wire hole 65 and the second wire hole 66 are respectively used for fixing the gas transmission pipe and the oil pipe. The inclined arrangement of the first wire hole 65 and the second wire hole 66 can not only strengthen the stability and firmness of the connection head part, but also avoid the oil return hidden danger that may be caused by parallel arrangement. The first wire hole 65 and the second wire hole 66 are staggered on the transverse section of the column 6, which facilitates the arrangement and installation of the gas transmission pipe, the oil pipe and the connection head, and at the same time, can also reduce the vertical volume of the column 6.

[0059] The gas inlet of the air tightness detection assembly and the gas inlet of the vacuumizing assembly are respectively in sealed communication with the first wire hole 65 through the gas transmission pipe. The air tightness detection assembly is used for inflating the workpiece cavity through the gas inlet and outlet hole 69 and maintaining pressure for air tightness detection when the top head is connected to the oil hole of the workpiece, and the vacuumizing assembly is used for vacuumizing the workpiece cavity through the gas inlet and outlet hole after air tightness detection of the workpiece,

[0060] The air tightness detection assembly includes a pressure reducing valve, a first pressure sensor 15, an inflation solenoid valve 8, a first stop solenoid valve 9, and a gas supply pipe for connection, and constitutes a gas supply channel from an external gas source to the first wire hole 65 and the gas inlet and outlet hole 69. The pressure reducing valve, the first pressure sensor 15, the inflation solenoid valve 8, and the first stop solenoid valve 9 are sequentially installed on the gas supply pipe. The first pressure sensor 15 is used to monitor the pressure of the gas supply pipe during inflation and pressure maintenance. The inflation solenoid valve 8 is used to open during inflation and close during pressure maintenance. The working pressure range of the inflation solenoid valve 8 is 0-137.9 kPa. The first stop solenoid valve 9 is used to close the gas supply pipe after the workpiece inner cavity is inflated and pressure maintained.

[0061] During air tightness detection, the workpiece inner cavity is inflated and pressure maintained by using the above-mentioned gas supply channel and components, and the sealing performance is judged by monitoring whether the pressure change is within a reasonable range. Since it can be automatically operated step by step, it overcomes the problems of existing detection methods, such as too many personnel, too many processes, too long process time, and incomplete product quality guarantee, thereby greatly improving work efficiency, reducing manual operation errors, effectively improving production efficiency, and realizing large-scale automated production, and reducing labor costs.

[0062] In this embodiment, in order to simplify and unify gas delivery and pressure control, three first pressure reducing valves are provided. One is a main pressure reducing valve for the main gas supply pipe after the external gas source, which is divided into two branch gas supply pipes after the main gas supply pipe. One of the branch gas supply pipes is provided with an inflation pressure reducing valve 13 and is connected to the inflation solenoid valve 8 to provide relatively stable 20 PSI gas during air tightness detection operation. The other branch gas supply pipe is provided with a cylinder pressure reducing valve 14 and is connected to the gas supply port of the cylinder body of the cylinder 4 for adjusting the clamping force of the cylinder 4.

[0063] The main pressure reducing valve, the inflation pressure reducing valve 13, and the cylinder pressure reducing valve 14 are connected to one gas source, and the gas passes through the three pressure reducing valves to subdivide different functions. The external gas source enters from the main pressure reducing valve, and then connects the other two pressure reducing valves. Their on-off is controlled by the electromagnetic valve, which is started step by step by the output signal of the programmable logic controller of the control system. It can simplify the setting of the gas supply pipe, facilitate the control and management of gas delivery and pressure.

[0064] In addition, three pressure sensors are provided. One is used to monitor the gas source pressure of the main gas supply pipe to ensure that the gas source supply is normal and the gas pressure meets the operation requirements. The second one is installed after the first stop valve and is used to monitor the pressure of the branch gas supply pipe during air tightness test, that is, the pressure of the inner cavity of the workpiece 5 during pressure maintenance, to determine whether the workpiece 5 of the truck chassis supporting wheel meets the sealing requirement. The other one is used on the exhaust pipe to monitor whether the vacuum negative pressure of the exhaust pipe and the vacuum extraction meet the requirements of 80 Pa pressure and 70 Pa inner cavity of the workpiece 5. The above-mentioned pressure sensors have digital display to display the required pressure value.

[0065] In the air tightness test, first, the gas of 137.9 kPa passes through the inflation pressure reducing valve 13 and then the inflation electromagnetic valve 8, and is filled to 137.9 kPa, and then is closed, and is kept for 30 seconds. Then, the air tightness of the workpiece 5 of the vehicle chassis load wheel is detected and judged according to the pressure value displayed on the pressure sensor. In this embodiment, it is required to be qualified between 0-137.9 kPa, and unqualified below the range, and the unqualified is displayed on the configured display screen, and automatic alarm and prompt are performed.

[0066] The first cut-off electromagnetic valve 9 is used to avoid negative pressure in the pipeline after evacuation, and oil return problem after oil injection. The cut-off electromagnetic valve is opened during inflation and pressure keeping, and is closed after the above operation is completed, that is, the first cut-off electromagnetic valve 9 is closed during oil injection and vacuumizing.

[0067] The vacuumizing assembly includes a vacuum pump, a second cut-off electromagnetic valve 10, a second pressure sensor 16, and a one-way valve. The air inlet of the vacuum pump is communicated with the first wire hole 65 through an air exhaust pipe. The second cut-off electromagnetic valve 10, the second pressure sensor 16, and the one-way valve are installed on the air exhaust pipe. The second pressure sensor 16 is used to detect the pressure of the air exhaust pipe during the evacuation of the inner cavity of the workpiece. The second cut-off electromagnetic valve 10 is used to close the air exhaust pipe during the inflation, pressure keeping, and oil injection of the inner cavity of the workpiece.

[0068] As shown in Figure 1 , Figure 6 * Figure 12 The oil injection assembly used in this embodiment includes a quantitative oil cup 7, an oil level detection sensor, and an oil valve. The oil inlet of the quantitative oil cup 7 is connected with an external electric oil pump and an oil tank through an oil conveying pipe in sequence. The oil injection assembly is communicated with the second wire hole 66 through an oil conveying pipe. The oil injection assembly is used to suck lubricating oil into the oil cavity of the workpiece 5 through the oil injection hole 70 by using pressure difference after vacuumizing.

[0069] The quantitative oil cup 7 is used to inject a certain amount of lubricating oil into the oil cavity of the workpiece 5 after the workpiece 5 meets the air tightness requirement. Since the device is used to suck lubricating oil into the oil cavity of the workpiece 5 by using negative pressure, the oil injection efficiency is high, the time is short, and the quantitative, controllable, and sufficient oil injection operation is realized, and waste can be effectively avoided.

[0070] The oil level detection sensor is fixed on the upper part of the quantitative oil cup 7 through bolts. The oil level detection sensor is used to detect the oil level of the quantitative oil cup 7 and stop oil injection after being filled. One end of the oil valve is communicated with the oil outlet 711 of the quantitative oil cup 7. The other end of the oil valve is connected with the second wire hole 66 through the oil conveying pipe as the oil supply port.

[0071] The quantitative oil cup 7 comprises an oil cup 71, an oil cup outer sleeve 72, an oil volume adjusting sleeve 73, and a cup cover 74. The oil cup 71 and the oil volume adjusting sleeve 73 are installed in the oil cup outer sleeve 72, the oil volume adjusting sleeve 73 is installed on the outer periphery of the upper portion of the oil cup 71 in reverse, and the cup cover 74 is installed on the upper end of the oil cup outer sleeve 72.

[0072] Continuing to refer to FIG. 1, Figure 8 , Figure 9 In this embodiment, the oil cup 71 is a cylindrical structure with an open upper end, the bottom of the oil cup 71 is provided with an oil outlet 711, the upper portion of the oil cup 71 is provided with the oil volume adjusting sleeve 73, the lower portion of the oil cup 71 is provided with an oil return groove 713, the upper portion of the oil cup 71 is provided with a vertical groove 712, the oil volume adjusting sleeve 73 is provided with an inclined groove 731, a sealing ring 76 is installed between the oil cup 71 and the oil volume adjusting sleeve 73, and the sealing ring 76 is located below the vertical groove 712 and the inclined groove 731.

[0073] The top plate of the oil volume adjusting sleeve 73 is provided with a threaded hole 732 and a through hole 733, the threaded hole 732 is connected with the cup cover 74 through an adjusting screw 75, the through hole 733 serves as an oil inlet of the quantitative oil cup 7, the bottom of the oil return groove 713 is provided with an oil outlet 714, and the oil outlet 714 is connected with an external oil tank through an oil pipe.

[0074] When the lubricating oil in the oil cup 71 is full, the lubricating oil can overflow through the inclined groove 731 and flow into the oil return groove 713 on the lower periphery, and then return to the oil tank through the oil outlet 714 and the oil pipe.

[0075] The oil level detection sensor of the oil filling assembly is installed above the oil cup 71 and fixed by bolts to detect the oil level, and the oil filling is stopped after the oil cup 71 is filled to the horizontal level. The oil valve is a pneumatic oil valve, and the upper port of the oil valve is communicated with the oil outlet 711 of the oil cup 71 through a connecting head. After vacuumizing, the oil filling is ready with a pressure sensor, and the oil valve is controlled to be opened by the oil cup electromagnetic valve 11.

[0076] The vacuumizing unit mainly comprises a vacuum pump, a second pressure sensor 16, a negative pressure valve and other components. After the air tightness detection, the process before the oil filling machine is started

[0077] The control system comprises a PLC programmable controller, a relay module, an input module, and a control power supply. The input module is used to input the pressure signals collected by the air tightness detection assembly, the oil filling assembly, the vacuumizing assembly, and the inner cavity of the workpiece to the PLC programmable controller, and the PLC programmable controller outputs signals to the relay module to control the start or stop of the air cylinder 4, the air tightness detection assembly, the oil filling assembly, and the vacuumizing assembly.

[0078] In this embodiment, the PLC programmable controller is a product of MITSUBISHI FX1S-30MT model.

[0079] The method for using the device, the process and steps are as follows:

[0080] 1. Place and position the vehicle chassis load wheel workpiece 5 in the direction shown, and rotate the oil hole position to the position aligned below the top head. Figure 1

[0081] 2. Then turn on the device power switch, vacuum device switch, and oil pump switch, and observe that the oil level in the oil tank and all pressure gauges are normal, and proceed to the next step.

[0082] 3. Press the start switch, the air tightness detection assembly works, the cylinder 4 drives the top head to the oil hole position, starts to inflate for 2 seconds to a pressure of 137.9 kPa, and then closes the inlet valve; pressure maintaining for 30 seconds, the pressure sensor monitors whether the internal cavity pressure of the workpiece is between 124.11-137.9 kPa, if yes, the exhaust valve is opened for 2 seconds, the vehicle chassis load wheel workpiece 5 is internally depressurized and exhausted, and then the exhaust valve is closed to proceed to the next step, otherwise it is determined that the workpiece is unqualified;

[0083] 4. The vacuum pumping assembly works to pump air in the internal cavity of the vehicle chassis load wheel workpiece 5, and the internal cavity is pumped to 70 Pa through the inlet and outlet holes 69 of the top head from the oil hole of the workpiece, and then the valve is closed. Proceed to the next step.

[0084] 5. The oil injection assembly works, the oil level and oil quantity are qualified, the oil valve is opened, the oil cavity of the vehicle chassis load wheel workpiece 5 is automatically sucked into the oil cavity by using pressure difference, the oil valve is closed after 5 seconds, and the cylinder 4 of the top head pressing assembly works to drive the top head to rise and reset.

[0085] The controller can realize automatic operation of the top head operation, solve the existing manual operation mode, and solve the problems of too many personnel, too many processes, too long process time, and incomplete product quality guarantee, greatly improve the work efficiency and reduce the manual operation error, can effectively improve the production efficiency and realize large-scale automatic production, and reduce the labor cost.

[0086] The technical contents not described in detail in the present application are all known technologies.​

Claims

1. An integrated air tightness testing and quantitative oiling device comprising a frame, characterized in that, The rack is provided with a top head pressing assembly, a gas tightness detection assembly, an oil injection assembly, a vacuum pumping assembly and a control system; the top head pressing assembly comprises a cylinder and a top head, the upper end of the cylinder is fixed on the rack, the free end of the piston rod at the lower end of the cylinder is connected with the upper part of the top head, and the top head is driven by the cylinder to ascend and descend; the top head comprises a column body, vertical gas passages and liquid passages are arranged in the column body at intervals, the gas passages form gas inlet and outlet holes on the lower end face of the column body, the liquid passages form oil injection holes on the lower end face of the column body, the lower end face of the column body is a stepped face, the height of the stepped face at the position of the oil injection holes is lower than the height of the stepped face at the position of the gas inlet and outlet holes, a first wire hole and a second wire hole are formed in the outer circumferential surface of the middle part of the column body and inclined downward, the inner side of the first wire hole is in communication with the gas passages, and the inner side of the second wire hole is in communication with the liquid passages; the inflation port of the gas tightness detection assembly and the gas inlet port of the vacuum pumping assembly are respectively in sealed communication with the first wire hole through a gas conveying pipe, the oil supply port of the oil injection assembly is in communication with the second wire hole through an oil conveying pipe, the gas tightness detection assembly is used for inflating the inner cavity of the workpiece through the gas inlet and outlet holes and keeping pressure to perform gas tightness detection when the top head is connected with the oil hole of the workpiece, the vacuum pumping assembly is used for pumping the inner cavity of the workpiece through the gas inlet and outlet holes after the gas tightness detection of the workpiece, and the oil injection assembly is used for sucking lubricating oil into the inner cavity of the workpiece through the oil injection holes by pressure difference after the vacuum pumping.

2. The integrated air tightness detection and quantitative oiling device according to claim 1, characterized in that, The column body comprises a middle thick cylindrical segment and a lower thin cylindrical segment arranged coaxially, and a funnel-shaped transition segment is arranged at the connecting end of the thick cylindrical segment and the thin cylindrical segment, and the diameter of the thick cylindrical segment is 3-6 times the diameter of the thin cylindrical segment.

3. The integrated air tightness detection and quantitative oiling device according to claim 1, characterized in that, The lower end face of the column body is a stepped face formed by two identical semicircles, and a sealing rubber ring is sleeved on the outer periphery of the lower end face of the column body.

4. The integrated air tightness detection and quantitative oiling device according to claim 1, characterized in that, The gas tightness detection assembly comprises a pressure reducing valve, a first pressure sensor, an inflation electromagnetic valve, a first cut-off electromagnetic valve and a gas conveying pipe for connection, the first wire hole is in communication with an external gas source through the gas conveying pipe, and the gas conveying pipe is sequentially provided with the pressure reducing valve, the first pressure sensor, the inflation electromagnetic valve and the first cut-off electromagnetic valve, the first pressure sensor is used for monitoring the pressure of the gas conveying pipe during inflation and pressure keeping, the inflation electromagnetic valve is used for being opened during inflation and being closed during pressure keeping, and the working pressure range of the inflation electromagnetic valve is 0-137.9 kPa, and the first cut-off electromagnetic valve is used for closing the gas conveying pipe after the inner cavity of the workpiece is inflated and kept pressure.

5. The integrated air tightness detection and quantitative oiling device according to claim 1, characterized in that, The oil injection assembly comprises a quantitative oil cup, an oil level detection sensor and an oil valve, the oil inlet of the quantitative oil cup is connected with an external electric oil pump and an oil tank through an oil conveying pipe in sequence, the oil level detection sensor is fixed on the upper part of the quantitative oil cup through bolts, and the oil level detection sensor is used for detecting the oil level of the quantitative oil cup and stopping oil injection after being filled, one end of the oil valve is connected with the oil outlet of the quantitative oil cup in communication, and the other end of the oil valve is connected with the second wire hole through the oil conveying pipe as an oil supply port.

6. The integrated air tightness detection and quantitative oiling device according to claim 5, characterized in that, The quantitative oil cup comprises an oil cup, an oil cup outer sleeve, an oil amount adjusting sleeve and a cup cover, the oil cup and the oil amount adjusting sleeve are installed in the oil cup outer sleeve, the oil amount adjusting sleeve is installed on the outer periphery of the upper part of the oil cup in reverse, the cup cover is installed on the upper end of the oil cup outer sleeve, the oil cup is a cylindrical structure with an open upper end, the bottom of the oil cup is provided with an oil outlet, the outer periphery of the upper part of the oil cup is provided with the oil amount adjusting sleeve, the outer periphery of the lower part of the oil cup is provided with an oil return groove, a vertical groove is formed in the upper part of the oil cup, an inclined groove is formed in the oil amount adjusting sleeve, a sealing ring is installed between the oil cup and the oil amount adjusting sleeve, and the sealing ring is located below the vertical groove and the inclined groove, a threaded hole and a through hole are formed in the top plate of the oil amount adjusting sleeve, the threaded hole is connected with the cup cover through an adjusting screw, and the through hole serves as an oil inlet of the quantitative oil cup, and the bottom of the oil return groove is provided with an oil outlet, and the oil outlet is connected with an oil tank outside through an oil pipe.

7. The integrated air tightness detection and quantitative oiling device according to claim 1, characterized in that, The vacuum pumping assembly comprises a vacuum pump, a second stop electromagnetic valve, a second pressure sensor and a one-way valve, the air inlet of the vacuum pump is communicated with the first wire hole through an air suction pipe, the second stop electromagnetic valve, the second pressure sensor and the one-way valve are installed on the air suction pipe, the second pressure sensor is used for detecting the air suction pipe pressure when the inner cavity of the workpiece is pumped, and the second stop electromagnetic valve is used for closing the air suction pipe when the inner cavity of the workpiece is inflated, pressure maintained and oil injected.

8. The integrated air tightness detection and quantitative oiling device according to claim 1, characterized in that, The control system comprises a PLC programmable controller, a relay module, an input module and a control power supply, the input module is used for inputting the pressure signals of the air tightness detection assembly, the oil injection assembly, the vacuum pumping assembly and the inner cavity of the workpiece collected to the PLC programmable controller, the PLC programmable controller outputs signals to the relay module, so as to control the start or stop of the air cylinder, the air tightness detection assembly, the oil injection assembly and the vacuum pumping assembly.

9. The method of using an integrated air tightness testing and quantitative oiling device, characterized in that, The use method comprises the following steps: S1, the air cylinder of the top head pressing assembly drives the top head to descend and connect with the oil hole of the workpiece; S2, the air tightness detection assembly works to inflate and detect the air tightness, the inner cavity of the workpiece is inflated to 20 PSI through the air inlet and outlet hole of the top head, then the air tightness detection assembly is closed, and the pressure is maintained for 30 seconds; the pressure sensor monitors whether the pressure of the inner cavity of the workpiece is between 124.11-137.9 kPa, if yes, the next step is entered, otherwise, the workpiece is determined to be unqualified; S3, the vacuum pumping assembly works to pump air, the inner cavity of the workpiece is pumped to 70 Pa through the air inlet and outlet hole of the top head, and then the vacuum pumping assembly is closed; S4, the oil injection assembly works to inject oil through the oil injection hole of the top head, and the inner cavity of the workpiece sucks the lubricating oil in the quantitative oil cup into the oil cavity of the workpiece through pressure difference; S5, after the oil injection assembly is closed to the set oil injection time, the air cylinder of the top head pressing assembly works to drive the top head to ascend and separate from the workpiece.

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