A reducer oil seal precision press-fitting and air tightness testing device and method

Abstract

The present invention discloses a reducer oil seal precision press-fitting and air tightness testing device and method, including an oil seal press-fitting mechanism and a servo precision press-fitting system, a pneumatic pressure-maintaining mechanism and a reducer air tightness testing system, and a reducer operating mechanism and operating system. The device realizes the integration of the two processes of oil seal precision press-fitting and reducer air tightness testing for large robots, and realizes the automatic precision press-fitting of oil seals and the automatic air tightness testing of reducers. The present invention integrates the oil seal assembly of large-scale reducers and the air tightness testing capabilities of reducers through the one-time installation of reducers, thereby saving manpower and increasing efficiency. Through automatic oil seal precision press-fitting and air tightness testing, the clamping time of reducers is reduced, and the air tightness testing efficiency of reducers is improved. The device has a simple testing scheme, low development cost, strong economic applicability, and high pass rate, and is suitable for batch assembly and air tightness testing of cycloidal pinwheel reducers for large-scale robots.

Description

Technical Field

[0001] The invention belongs to the field of assembly equipment, and in particular relates to a reducer oil seal precision press-fitting and air tightness detection device and method. Background Art

[0002] The rotating shaft lip rubber seal, i.e., the oil seal, is the core component of the cycloidal pinwheel reducer for robots. Its main function is to prevent the leakage of media such as lubricating oil and grease inside the reducer, and to prevent external dust and moisture from invading the sealing mechanism, so as to ensure the normal operation of the machine under good lubrication conditions. Since the advent of the oil seal, it has become an indispensable component of the reducer due to its simple structure and good sealing effect. The assembly accuracy of the oil seal installation process and the airtightness leakage value of the reducer after the oil seal is installed are directly related to the sealing performance and service life of the reducer. Therefore, during the assembly process of the reducer and when the whole machine is offline, the assembly of the oil seal and the airtightness test of the reducer are the top priorities of the reducer quality control. At present, most large-scale robots use cycloidal pinwheel reducers with a mass of 30Kg and an outer diameter of 300+mm. The press-fitting and airtightness testing of the oil seal are two independent separate operations. During the process, there are problems such as difficulty in carrying the reducer and assembly and testing tooling, difficulty in oil seal assembly, low pass rate, difficulty in airtightness testing, and low efficiency of oil seal assembly and testing. Therefore, there is an urgent need for a high-precision and efficient oil seal assembly and airtightness testing equipment to solve the pain points and difficulties of oil seal press-fitting and airtightness testing of cycloidal pinwheel reducers for large-scale robots. Summary of the invention

[0003] In order to solve the above technical problems, the specific technical solutions adopted by the present invention are as follows:

[0004] The present invention first provides a reducer oil seal precision press-fitting and air tightness detection device, including an oil seal press-fitting assembly, a feeding station transfer mechanism, a press-fitting servo mechanism, and an air tightness detection mechanism;

[0005] The loading station transfer mechanism is used to provide a station for loading the oil seal press-fitting assembly onto the reducer to be processed, and the loading station transfer mechanism is also used to transfer the reducer to the corresponding processing stations of the oil seal press-fitting mechanism and the air tightness detection mechanism;

[0006] The oil seal press assembly comprises an oil seal and an oil seal guide, wherein the oil seal guide is mounted on the reducer and the oil seal is placed in the oil seal guide;

[0007] The oil seal press-fitting mechanism comprises a press-fitting servo mechanism arranged above the press-fitting station, an oil seal press-fitting manual operating mechanism for controlling the press-fitting servo mechanism, and a press-fitting data display; the press-fitting servo mechanism comprises an oil seal gland for pressing the oil seal into the oil seal cavity of the reducer, and the press-fitting servo mechanism is also provided with a pressure sensor for measuring pressure and a grating ruler for measuring displacement; the press-fitting data display is connected to the pressure sensor and the grating ruler and displays the information measured by the pressure sensor and the grating ruler;

[0008] The air tightness detection mechanism includes a pressure-maintaining cylinder, a jig upper mold, an air tightness detection controller, a reducer air tightness manual operation mechanism and an air tightness data display; the pressure-maintaining cylinder and the jig upper mold are both arranged above the air tightness detection station, and the pressure-maintaining cylinder is used to provide pressure during the downward pressing process of the reducer jig upper mold; the reducer jig upper mold is used to clamp the reducer to be tested during the air tightness detection process; the air tightness detection controller is used to inject gas into the reducer cavity; the air tightness manual operation mechanism is used to adjust the position of the jig upper mold, the pressure value of the pressure-maintaining cylinder and the gas pressure output by the air tightness detection controller; the air tightness data display is connected to the pressure-maintaining cylinder and displays the leakage value after calculating it according to the pressure of the pressure-maintaining cylinder.

[0009] As a preferred solution of the present invention, the loading station transfer mechanism includes a servo motor, a slide rail, a movable plate arranged on the slide rail through a slider, a jig lower mold arranged on the movable plate, and a ball screw arranged parallel to the slide rail; the servo motor is transmission connected to the ball screw; a screw nut is sleeved on the ball screw, and the screw nut is fixedly connected to the movable plate; the jig lower mold is provided with a loading guide block with a 45° slope, and the loading guide block is used to ensure that the reducer can slide into the positioning hole of the jig lower mold.

[0010] As a preferred solution of the present invention, the detection equipment also includes a buzzer; the buzzer is connected to the press-fitting data display and the airtightness data display respectively. When the pressure and displacement of the target position displayed by the press-fitting data display are not within the range or the leakage value displayed by the airtightness data display is not within the qualified range, the buzzer alarms.

[0011] As a preferred solution of the present invention, the pressure-maintaining cylinder and the upper mold of the jig are connected by a gas spring support rod; when the pressure-maintaining cylinder is pressurized, the gas spring support rod pushes the reducer jig upper mold downward; when the pressure-maintaining cylinder is deflated, the gas spring support rod brings the jig upper mold back to its initial position.

[0012] The present invention also provides an oil seal press-fitting and air tightness testing method of the above reducer oil seal precision press-fitting and air tightness testing equipment, comprising the following steps:

[0013] 1) Place the reducer on the loading station of the loading station transfer mechanism, and load it in the order of oil seal guide and oil seal;

[0014] 2) The loading station transfer mechanism transports the loaded reducer to the station of the oil seal pressing mechanism.

[0015] 3) The press-fitting servo mechanism is equipped with an oil seal gland, which is pressed downward by the press-fitting servo mechanism to press the oil seal into the reducer through the oil seal gland. During the press-fitting process, the pressure and displacement of the oil seal press-fitting are monitored by the pressure sensor and the grating ruler. If the pressure and displacement are qualified, the reducer is transported to the air tightness detection station through the feeding station operation mechanism. If not, the reducer is re-operated to the feeding station through the feeding station operation mechanism for re-loading.

[0016] 4) After the oil seal is pressed and installed qualifiedly, the reducer is moved to the air tightness test station. The upper mold of the reducer fixture is pressed down after the pressure-maintaining cylinder provides power and clamps the reducer to be tested on the air tightness test station; the air tightness test controller controls the air source to inflate the cavity of the reducer with the air pressure and time set by the reducer air tightness manual operation mechanism. After the inflation is completed, the air tightness test controller stabilizes the voltage of the reducer. After the voltage stabilization is completed, the air tightness test controller performs an air tightness test on the reducer within the specified time to detect the pressure difference within the specified time; if the pressure difference is within the verification range, it means that the air tightness test is qualified and the reducer is moved to the next process. If it is unqualified, the loading station operation mechanism will re-operate the reducer to the loading station for re-loading.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention optimizes the oil seal press-fitting tool design and press-fitting process and optimizes the air-tightness test tool design and process, combines mechanical, electrical control, information, computer and other technologies, develops a set of oil seal press-fitting and air-tightness testing equipment, realizes the integration of the oil seal assembly of the reducer and the air-tightness testing capability of the reducer, reduces the clamping time and work intensity of the reducer through automatic oil seal precision press-fitting and air-tightness testing, improves the efficiency of the oil seal press-fitting and air-tightness testing, the test device has a simple test scheme, low development cost, strong economic applicability, and high pass rate, and is suitable for batch assembly and air-tightness testing of cycloidal pinwheel reducers for large-scale robots. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the equipment;

[0020] Figure 2 It is the main cross-sectional view of the equipment;

[0021] Figure 3 This is the axonometric drawing of the airtightness test fixture;

[0022] Figure 4 This is a cross-sectional view of the airtightness test fixture;

[0023] Figure 5 This is a cross-sectional view of the oil seal press-fitting fixture;

[0024] Figure 6 This is a schematic diagram of the oil seal gland;

[0025] Figure 7 Schematic diagram of oil seal guide. DETAILED DESCRIPTION

[0026] The present invention is further described and illustrated below in conjunction with specific embodiments. The embodiments are merely exemplary of the present disclosure and do not define the scope of limitation. The technical features of each embodiment of the present invention may be combined accordingly without conflicting with each other.

[0027] The specific technical solutions adopted by the present invention are as follows:

[0028] Figure 1 As shown, the device includes the following parts: reducer 1 to be installed with oil seal and air tightness test; jig lower die 2; mobile plate 3; slide rail 4; slider 5; equipment workbench 6; oil seal storage cabinet 7; heavy-duty spring shock-absorbing caster 8; electrical appliance storage cabinet 9; QR code scanner 10; oil seal press-fit manual operation mechanism 11; equipment master control mechanism 12; press-fit data display 13; reducer air tightness manual operation mechanism 14; air pipe joint 16; air tightness test controller 19; air Tightness data display 20; gas spring support rod 21; pressure-maintaining cylinder 22; gas spring support rod 23; press-fit servo mechanism 24; servo motor 25; planetary reducer 26; screw nut 27; ball screw 28; jig upper die 29; jig bracket 30; jig handle 32; feeding guide block 33; jig air injection hole 34; upper die sealing silicone gasket 35; lower die sealing silicone gasket 36; oil seal cover 37; oil seal guide 38; oil seal 39; buzzer 40.

[0029] like Figure 2 As shown, the loading station transfer mechanism includes a servo motor, a slide rail, a movable plate arranged on the slide rail through a slider, a jig lower die arranged on the movable plate, and a ball screw arranged parallel to the slide rail; the servo motor 25 is transmission-connected to the ball screw 28; a screw nut 27 is sleeved on the ball screw 28, and the screw nut 27 is fixedly connected to the movable plate; the jig lower die is provided with a loading guide block with a 45° slope, and the loading guide block is used to ensure that the reducer can slide into the positioning hole of the jig lower die. The loading station transfer mechanism is used to provide a station for loading the oil seal press-fitting assembly onto the reducer to be processed. The loading station transfer mechanism is also used to transfer the reducer to the corresponding processing stations of the oil seal press-fitting mechanism and the air tightness detection mechanism; as shown Figure 3As shown, in a specific embodiment of the present invention, the jig lower mold 2 is provided with a loading guide block 33 for positioning the reducer, a jig handle 32 for easy picking, and a jig bracket for facilitating the positioning of the airtightness test jig upper mold 29; the servo motor 25 is connected to the screw nut 27 and the ball screw 28 through the planetary reducer 26.

[0030] like Figure 5 As shown, the oil seal press assembly includes an oil seal, an oil seal guide and an oil seal gland. The oil seal guide is installed on the reducer, and the oil seal is placed in the oil seal guide; the oil seal gland is used to press the oil seal into the oil seal cavity of the reducer;

[0031] The oil seal press-fitting mechanism comprises a press-fitting servo mechanism arranged above the press-fitting station, an oil seal press-fitting manual operating mechanism for controlling the press-fitting servo mechanism, and a press-fitting data display; the press-fitting servo mechanism is used to press the oil seal into the oil seal cavity of the reducer, and the press-fitting servo mechanism is provided with a pressure sensor for measuring pressure and a grating ruler for measuring displacement; the press-fitting data display is connected to the pressure sensor and the grating ruler and displays the information measured by the pressure sensor and the grating ruler;

[0032] The air tightness detection mechanism includes a pressure-maintaining cylinder 22, a jig upper mold 29, an air tightness detection controller 19, a reducer air tightness manual operation mechanism 14 and an air tightness data display 20; the pressure-maintaining cylinder 22 and the jig upper mold 29 are both arranged above the air tightness detection station through a bracket 15, and the pressure-maintaining cylinder is used to provide pressure during the downward pressing process of the jig upper mold; the pressure-maintaining cylinder and the jig upper mold are connected by a gas spring support rod 23; when the pressure-maintaining cylinder is pressurized, the gas spring support rod 23 brings the reducer jig upper mold down; when the pressure-maintaining cylinder is deflated, the gas spring support rod brings the jig upper mold back to the initial position; the jig upper mold is used to clamp the reducer to be tested during the air tightness detection process; the air tightness detection controller is used to inject gas into the reducer cavity; the air tightness data display is connected to the pressure-maintaining cylinder and displays the leakage value after calculating it according to the pressure of the pressure-maintaining cylinder. Figure 4 As shown, in a specific embodiment of the present invention, a jig gas injection hole 34 is opened on the jig upper mold 29, and the air tightness detection controller injects gas from the jig gas injection hole 34 into the reducer cavity through the air pipe joint 16;

[0033] The buzzer is connected to the press-fitting data display and the airtightness data display respectively. When the pressure and displacement of the target position displayed by the press-fitting data display are out of the range or the leakage value displayed by the airtightness data display is out of the qualified range, the buzzer alarms.

[0034] In a specific embodiment of the present invention, the equipment of the present invention is installed on an equipment workbench 6; an oil seal storage cabinet 7 and an electrical appliance storage cabinet 9 are provided on the bottom surface of the equipment workbench 6; the oil seal storage cabinet 7 is used to store oil seals to be installed, and the electrical appliance storage cabinet 9 is used to store motor drivers, computer hosts, equipment power supplies, programmable controllers, safety relays and other accessories; heavy-duty spring shock-absorbing casters 8 are also provided at the bottom of the oil seal storage cabinet 7 and the electrical appliance storage cabinet 9, so that the equipment of the present invention can be transferred more easily.

[0035] A specific test plan for the precision press-fitting of the oil seal of a cycloid pinwheel reducer for a robot and the air tightness detection equipment of the reducer is as follows:

[0036] Specific implementation plan for the transfer mechanism and equipment operation of the loading station:

[0037] The operator uses a truss to place the reducer on the jig lower die 2. The lower die is provided with a loading nylon guide block 33, and the guide block is provided with a 45° slope. The loading process ensures that the reducer slides accurately into the positioning hole of the jig lower die 2 on the transfer mechanism, and the oil seal guide 38 is installed on the reducer, and the oil seal 39 is placed in the oil seal guide 38. The operator uses a QR code scanner 10 to scan the QR code on the reducer, and the QR code information is entered into the system. The operator starts the equipment by operating the equipment master control mechanism 12, and the servo motor 25 in the transfer mechanism is started, and the screw nut 27 and the ball screw 28 are used to drag the mobile plate from the loading station to the pressing station and the air tightness test station for operation. After the oil seal is pressed at the pressing station, the transfer station performs an air tightness test on the reducer. After the air tightness test is qualified, the transfer station returns the reducer to the loading station.

[0038] Specific implementation plan for precision press-fitting of oil seals at the press-fitting station:

[0039] The material of the oil seal guide 38 tooling is high-strength polyamide fiber, and the moderate hardness and strength ensure the best possible protection of the oil seal during operation. Figure 7As shown: the upper hole D1 is located in the upper part of the hole of the oil seal guide, and the lower hole D2 is located in the lower part of the oil seal guide. The diameter of the upper part of the oil seal guide is larger than that of the oil seal, and the clearance is matched. When loading, the oil seal can be buried in the upper hole D1, which is convenient for the initial alignment of the press-fitting. The diameter of the lower part of the oil seal guide is consistent with the size of the oil seal cavity, and it can be accurately aligned and pressed into the oil seal cavity during press-fitting. The inner hole and the end face are designed to be an arc transition, and the R angle value is 2±0.5mm to ensure that the oil seal is protected from bumps and scratches when the reducer is loaded. The upper hole D1 of the oil seal guide is 0.1-0.2mm larger than the maximum diameter of the oil seal, and the depth L3 of the hole with diameter D1 is 2-3mm larger than the maximum width of the oil seal, ensuring that the oil seal can be freely buried in the upper hole D1 at the beginning, and the lower hole D2 of the oil seal guide 38 is consistent with the design size of the reducer oil seal cavity, ensuring that the oil seal can smoothly enter the reducer oil seal cavity during the pressing process. Figure 6 As shown, the aperture size D3 of the oil seal gland 37 is 1.5-2mm larger than the diameter of the outer circle of the reducer oil seal block. The end face of the oil seal gland 37 is designed to transition with the inner and outer circles in an arc, and the transition arc R angle value is 2±0.5mm, which ensures that the oil seal gland 37 is prevented from being bumped, scratched, or flanging when the oil seal 39 is pressed. The depth dimension L2 of the oil seal gland 37 is 0.5±0.1mm larger than the depth dimension L1 of the oil seal guide, and at the same time, the parallelism of the two end surfaces of the oil seal guide and the oil seal gland in the depth direction is within 0.03mm. During the press-fitting operation, it can ensure that the elastic deformation of the rubber can be compensated so that the oil seal gland is pressed into the limit position of the reducer cavity, and at the same time, it can ensure that the maximum pressure applied by the gland during the press-fitting operation is borne by the reducer instead of the oil seal, and the press-fitting parallelism of the oil seal after it is pressed into place can be ensured to avoid defects such as deflection, protrusion, and flanging of the oil seal.

[0040] The press-fitting servo mechanism 24 is provided with a pressure sensor and a grating ruler, which can accurately control and measure the pressure and displacement. The press-fitting program includes 4 sections: fast feeding stage, slow press-fitting stage, pressure holding stage, and fast return stage. The 4-section program control ensures that the oil seal is accurately pressed into the reducer oil seal cavity; the servo press-fitting system includes two sections of judgment programs in the slow press-fitting stage: judging the pressure and displacement from the target position to the position of half the oil seal width, and judging the pressure and displacement at the target position. Ensure that the pressure and displacement at the judgment position are within the design range. If the program determines that the oil seal is press-fitted, it will flow to the airtightness detection station, otherwise it will be NG. When NG, the reducer will return to the loading station through the operating mechanism, and the buzzer 40 of the equipment will alarm. In a specific embodiment of the present invention, the oil seal guide and the airtight upper die are structurally designed to ensure that after the oil seal guide is press-fitted, the airtightness jig upper die and the oil seal guide are not interfered; ensure that after the oil seal is press-fitted, the oil seal guide does not need to be unloaded, and the airtightness test can also be performed.

[0041] Specific implementation plan for air tightness testing at air tightness testing station:

[0042] The upper mold 29 of the air tightness test jig is connected to the pressure-maintaining cylinder 22, two gas spring support rods 21 and the pressure plate. The upper mold of the jig is provided with a jig gas injection hole 34 for the gas inlet channel. The position in contact with the reducer is provided with an upper mold silicone gasket 35. The position in contact with the reducer by the jig lower mold 2 is provided with a lower mold sealing silicone pad 36. The air pipe joint connects the air source, the upper mold 29 of the air tightness test jig and the air tightness detection controller 19 through the air pipe. After the reducer oil seal pressing procedure is completed, the transfer mechanism connects the reducer to the air tightness test station. The pressure-maintaining cylinder 22 presses the upper mold 29 of the jig downward. During the pressing process, the jig bracket 30 of the upper mold is pressed into the jig lower mold 2. At this time, the silicone gasket 35 of the upper mold and the sealing silicone pad 36 of the lower mold are fully in contact with the reducer and are in an extreme compression state, and the pressure-maintaining cylinder 22 maintains pressure.

[0043] The air tightness detection controller 19 injects the air from the air source into the reducer cavity through the air injection hole 34 of the jig through the air pipe. The air tightness detection program includes four sections: air injection, pressure stabilization, detection, and air release. By setting a section judgment program in the detection stage, the leakage value of the detection stage is determined. The leakage value of the detection stage is: the difference between the initial pressure of the gas in the detection stage and the final pressure at the end of the stage is the leakage value. When the pressure difference is within a reasonable range, the pressure-maintaining cylinder 22 is deflated, and the gas spring support rod 21 returns to the initial position with the jig upper mold. The leakage value is displayed on the air tightness data display 20. If the leakage value is within the qualified range, the transfer mechanism transfers the reducer to the loading station. If the leakage value exceeds the tolerance, the buzzer 40 alarms, and the transfer mechanism transfers the reducer to the loading station. At this time, the operator uses a truss to move the reducer to the next process, and reloads a new reducer for oil seal press-fitting and air tightness detection.

[0044] Table 1 Air tightness test parameters

[0045]

[0046] Table 2 Real-time data of air tightness test of a reducer

[0047]

[0048]

[0049] It can be seen from Tables 1 and 2 that the use of the reducer oil seal precision press-fitting and air tightness testing equipment of the present invention to oil seal the reducer reduces the reducer clamping time and work intensity, and the oil seal press-fitting has high precision. In the multiple groups of reducer air tightness tests shown in Table 2, the pass rate reached 100%; the pain points and difficulties of oil seal press-fitting and air tightness testing of wheel reducers are solved.

[0050] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A reducer oil seal precision press-fitting and air tightness testing equipment, characterized in that: It includes an oil seal press-fitting assembly, a loading station transfer mechanism, and an air tightness detection mechanism; the reducer is a cycloid pinwheel reducer for robots; The loading station transfer mechanism is used to provide a station for loading the oil seal press-fitting assembly onto the reducer to be processed, and the loading station transfer mechanism is also used to transfer the reducer to the corresponding processing stations of the oil seal press-fitting mechanism and the air tightness detection mechanism; The oil seal press-fitting assembly comprises an oil seal and an oil seal guide, wherein the oil seal guide is installed on the reducer, and the oil seal is placed in the oil seal guide; the material of the oil seal guide tooling is high-strength polyamide fiber, and the intersection of the inner wall surface and the end surface of the oil seal guide is designed to be an arc transition, and the R angle value of the arc is 1.5mm~2.5mm; the diameter of the upper end hole D1 of the oil seal guide is 0.1mm~0.2mm larger than the maximum diameter of the oil seal, and the depth L3 of the upper end hole D1 is 2mm~3mm larger than the maximum width of the oil seal, ensuring that the oil seal can be freely buried in the upper end hole D1 at the beginning, and the lower end hole D2 of the oil seal guide is consistent with the design size of the reducer oil seal cavity, ensuring that the oil seal can smoothly enter the reducer oil seal cavity during the pressing process; The oil seal press-fitting mechanism comprises a press-fitting servo mechanism arranged above the press-fitting station, an oil seal press-fitting manual operating mechanism for controlling the press-fitting servo mechanism, and a press-fitting data display; the press-fitting servo mechanism comprises an oil seal gland for pressing the oil seal into the oil seal cavity of the reducer, and the press-fitting servo mechanism is also provided with a pressure sensor for measuring pressure and a grating ruler for measuring displacement; the press-fitting data display is connected to the pressure sensor and the grating ruler and displays the information measured by the pressure sensor and the grating ruler; The aperture size D3 of the oil seal gland is 1.5mm~2mm larger than the diameter of the outer circle of the reducer oil seal block, the intersection of the end face of the oil seal gland and the inner and outer wall surfaces are designed to be arc transition, the transition arc R angle value is 1.5mm~2.5mm, the depth dimension L2 of the oil seal gland is 0.4~0.6mm larger than the depth dimension L1 of the oil seal guide, and at the same time, the parallelism of the oil seal guide and the two end faces of the oil seal gland is ensured to be within 0.03mm; The press-fitting program includes 4 sections: fast feeding stage, slow press-fitting stage, pressure holding stage, and fast return stage. The 4-section program control ensures that the oil seal is accurately pressed into the reducer oil seal cavity; the servo press-fitting system includes two sections of judgment programs in the slow press-fitting stage: judging the pressure and displacement from the target position to the position of half the oil seal width, and judging the pressure and displacement at the target position; ensuring that the pressure and displacement at the judgment position are within the design range, and if the program judges that the oil seal is pressed and qualified, it will flow to the airtightness detection station, otherwise NG; The air tightness detection mechanism includes a pressure-maintaining cylinder, a jig upper mold, an air tightness detection controller, a reducer air tightness manual operation mechanism and an air tightness data display; the pressure-maintaining cylinder and the jig upper mold are both arranged above the air tightness detection station, and the pressure-maintaining cylinder is used to provide pressure during the process of pressing down the reducer jig upper mold; the reducer jig upper mold is used to clamp the reducer to be tested during the air tightness detection process; the air tightness detection controller is used to inject gas into the reducer cavity; the air tightness manual operation mechanism is used to adjust the position of the jig upper mold, the pressure value of the pressure-maintaining cylinder and the gas pressure output by the air tightness detection controller; the air tightness data display is connected to the pressure-maintaining cylinder and displays the leakage value after calculating the pressure of the pressure-maintaining cylinder; a jig air injection hole is opened on the jig upper mold, and the air tightness detection controller injects gas from the jig air injection hole into the reducer cavity through the air pipe joint; an upper mold silicone gasket is provided at the position where the reducer jig upper mold contacts the reducer; The air tightness test procedure includes four stages: gas injection, pressure stabilization, detection, and air release. The leakage value of the detection stage is determined by setting a stage judgment program during the detection stage. The leakage value of the detection stage is: the difference between the initial pressure of the gas in the detection stage and the final pressure at the end of the stage is the leakage value. The leakage value is displayed on the air tightness data display.

2. The reducer oil seal precision press-fitting and air tightness testing equipment according to claim 1 is characterized in that: The loading station transfer mechanism includes a servo motor, a slide rail, a movable plate arranged on the slide rail through a slider, a jig lower die arranged on the movable plate, and a ball screw arranged parallel to the slide rail; the servo motor is transmission-connected to the ball screw; a screw nut is sleeved on the ball screw, and the screw nut is fixedly connected to the movable plate; the jig lower die is provided with a loading guide block with a 45° slope, and the loading guide block is used to ensure that the reducer can slide into the positioning hole of the jig lower die.

3. The reducer oil seal precision press-fitting and air tightness testing equipment according to claim 1 is characterized in that: It also includes a buzzer; the buzzer is connected to the press-fitting data display and the airtightness data display respectively. When the pressure and displacement of the target position displayed by the press-fitting data display are not within the range or the leakage value displayed by the airtightness data display is not within the qualified range, the buzzer alarms.

4. The reducer oil seal precision press-fitting and air tightness testing equipment according to claim 1 is characterized in that: The pressure-maintaining cylinder and the upper die of the jig are connected by a gas spring support rod; when the pressure-maintaining cylinder is pressurized, the gas spring support rod pushes the upper die of the reducer jig downward; when the pressure-maintaining cylinder is deflated, the gas spring support rod brings the upper die of the jig back to its initial position.

5. The reducer oil seal precision press-fitting and air tightness testing equipment according to claim 2 is characterized in that: A lower mold sealing silicone pad is provided at the contact position between the lower mold of the fixture and the reducer.

6. The reducer oil seal precision press-fitting and air tightness testing equipment according to claim 1 is characterized in that: The loading station transfer mechanism also includes a two-dimensional code scanning gun, which is used to scan the two-dimensional code information on the reducer.

7. A method for oil seal pressing and air tightness testing of the reducer oil seal precision pressing and air tightness testing equipment as claimed in claim 1, characterized in that: The following steps are involved: 1) Place the reducer on the loading station of the loading station transfer mechanism, and load it in the order of oil seal guide and oil seal; 2) The loading station transfer mechanism transports the loaded reducer to the station of the oil seal pressing mechanism. 3) The press-fitting servo mechanism is equipped with an oil seal gland, which is pressed downward by the press-fitting servo mechanism to press the oil seal into the reducer through the oil seal gland. During the press-fitting process, the pressure and displacement of the oil seal press-fitting are monitored by the pressure sensor and the grating ruler. If the pressure and displacement are qualified, the reducer is transported to the air tightness detection station through the feeding station operation mechanism. If not, the reducer is re-operated to the feeding station through the feeding station operation mechanism for re-loading. 4) After the oil seal is pressed and installed successfully, the reducer moves to the air tightness test station. The upper mold of the reducer fixture is pressed down after the pressure-maintaining cylinder provides power and clamps the reducer to be tested on the air tightness test station; the air tightness test controller controls the air source to inflate the reducer cavity with the air pressure and time set by the reducer air tightness manual operation mechanism. After the inflation is completed, the air tightness test controller stabilizes the pressure of the reducer. After the pressure stabilization is completed, the air tightness test controller performs an air tightness test on the reducer within the specified time to detect the pressure difference within the specified time; if the pressure difference is within the verification range, it means that the air tightness test is qualified and the reducer is moved to the next process. If it is unqualified, the loading station operation mechanism will re-operate the reducer to the loading station for re-loading.

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