Jig for pressurizing rotor

Abstract

The utility model relates to the technical field of part processing, and discloses a jig for pressurizing a rotor, which can realize centimeter-level real-time feedback of the press-in depth of stamping equipment through the contact between a spring firing pin embedded in an elastic telescopic sleeve and a sensing groove in combination with sensor and capacitive detection; compared with a traditional jig depending on manual visual inspection or mechanical limiting, the positioning error caused by rotor tolerance or assembly deflection can be dynamically compensated, and the assembly consistency is improved; a sensor deformation signal can also directly drive stamping equipment to adjust the contact distance or pressurization parameters (such as pressure and speed), and the problem of rotor deformation or insufficient bonding strength caused by overpressure or underpressure in traditional open-loop control is avoided.

Description

Technical Field

[0001] This utility model relates to the field of parts processing technology, specifically to a jig for pressurizing a rotor. Background Technology

[0002] As the core power component of an air conditioning system, the manufacturing quality of the compressor's internal stator core directly determines the motor's energy efficiency and operational stability. Traditional stator cores are formed by precision stacking of sheet metal stamped from electromagnetic steel plates. This process places stringent requirements on the geometric tolerances of the sheets, especially the axial perpendicularity (usually controlled within ±0.05mm).

[0003] In current industrial production, the sheet metal stamping process generally adopts a semi-automated production mode, which mainly has the following technical defects:

[0004] (1) There are too many manual intervention steps. Operators need to frequently perform mold positioning calibration and piece picking operations, with a labor intensity index as high as 3.8 and an error rate of 0.5%-1.2%.

[0005] (2) After the stamped sheet is demolded, it is easy to cause edge warping and deformation. Sampling inspection showed that the verticality deviation rate was 4.7%-6.3%, which led to the need to add a manual sorting step in the stacking process.

[0006] (3) Traditional pneumatic material handling mechanisms are prone to secondary deformation of loose pieces when operating at high speed (>45 pieces / minute), and the dynamic verticality deviation can reach 2.3 times that of the static working condition.

[0007] Although the industry has attempted to improve the process by using six-axis robotic arms in conjunction with vision positioning systems, technical bottlenecks such as poor material handling stability and insufficient verticality compensation accuracy remain due to defects in mold structure design, which restricts the improvement of the mass production qualification rate of high-end variable frequency compressor products. Summary of the Invention

[0008] This utility model is a fixture for pressurizing a rotor, designed to overcome the technical problems existing in the prior art.

[0009] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0010] A jig for pressurizing a rotor includes: a worktable, a positioning device, an assembly table, and a stamping device; the assembly table is mounted on the worktable, and the stamping device is movably disposed above the assembly table;

[0011] The positioning device includes an elastic telescopic sleeve and a collision contact platform. The elastic telescopic sleeve is rigidly connected to the drive end of the stamping equipment, and the collision contact platform is fixed to the top of the assembly table and coaxially arranged with the elastic telescopic sleeve. A telescopic spring striker is nested inside the elastic telescopic sleeve, and a sensing groove that contacts the spring striker is provided on the collision contact platform for real-time feedback of the pressing depth of the stamping equipment.

[0012] Preferably, the elastic telescopic sleeve and the collision contact platform are located on the same horizontal projection plane.

[0013] Furthermore, a sensor is provided in the sensing groove of the collision contact platform, and the elastic telescopic sleeve makes deformation contact with the sensor in the sensing groove through a spring striker.

[0014] Preferably, when the sensor deforms, the contact distance between its assembly table and the stamping equipment can be controlled by manually observing its sensor array; alternatively, the collision contact table can be electrically connected to the stamping equipment, and when the sensor deforms, the electrical signal drives the stamping equipment to stamp the rotor.

[0015] Furthermore, the assembly table includes a stamping base and a lifting assembly. The stamping base is disposed on the worktable, and the lifting assembly is connected to the bottom of the worktable for driving the stamping base to move up and down.

[0016] Furthermore, the stamping equipment includes a drive assembly, a guide assembly, and a rotor pressurizing expansion head; the drive assembly is disposed above the assembly table; the rotor pressurizing expansion head is suspended and connected below the drive assembly through the guide assembly.

[0017] Furthermore, the rotor pressurizing expansion head includes a cemented carbide block that pressurizes the entire rotor shaft surface and an expansion head that pressurizes the rotor shaft hole. The expansion head is slidably engaged with the central shaft hole of the cemented carbide block, and the cemented carbide block and the expansion head are respectively connected to the drive assembly.

[0018] Furthermore, the workbench includes a machining base, a CNC robotic arm, and a protective cover; the machining base is provided with several assembly tables for receiving rotors, the assembly tables are provided with protective covers, and a CNC robotic arm is provided above the machining base, the CNC robotic arm is connected to a stamping device for stamping the rotors on the assembly tables.

[0019] Furthermore, the top of the CNC robotic arm is provided with a slide rail, and the CNC robotic arm is connected to the slide rail and can slide along the length of the slide rail.

[0020] Furthermore, a telescopic frame is provided above the processing base, and the telescopic frame is connected to a protective cover for driving the protective cover to open and close.

[0021] Furthermore, the sensors installed in the sensing groove include piezoelectric thin film sensors, capacitive displacement sensors, and inductive proximity sensors.

[0022] Furthermore, the assembly table and stamping equipment are driven by hydraulic, pneumatic, or electric means.

[0023] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0024] ① Cooperative positioning of the elastic telescopic sleeve and the collision contact platform

[0025] By using a spring-loaded striker nested within an elastic telescopic sleeve to contact the sensing slot, combined with sensor and capacitive detection, centimeter-level real-time feedback of the stamping depth can be achieved. Compared to traditional fixtures that rely on manual visual inspection or mechanical limits, this solution can dynamically compensate for positioning errors caused by rotor tolerances or assembly misalignment, improving assembly consistency. The sensor deformation signal can also directly drive the stamping equipment to adjust the contact distance or pressurization parameters (such as pressure and speed), avoiding rotor deformation or insufficient bonding strength caused by over- or under-pressure in traditional open-loop control.

[0026] ② Multifunctional integrated pressurization and dynamic pressure distribution

[0027] The rotor shaft surface can be uniformly pressurized by hard alloy blocks, allowing the rotor to be pressed into the assembly table, avoiding local stress concentration caused by traditional single-point pressurization; the expansion head can be slidably engaged with the central shaft hole of the block, and expansion can be achieved by hydraulic / electric drive to eliminate the lamination gap, and microscopic interference strengthening of the rotor shaft hole can be performed to improve the bonding strength; the internal and external pressurization sequence and pressure gradient can be optimized in real time by sensor data to avoid cracks in the rotor material due to stress abrupt changes, which is especially suitable for the precision assembly of highly brittle rotor materials.

[0028] ③ High-efficiency automation and flexible production

[0029] The CNC robotic arm moves along the slide rail, and in conjunction with the parallel layout of multiple assembly tables on the processing base, it realizes the full-process automation of the stamping equipment to press multiple rotors, which is many times more efficient than manual operation.

[0030] ④ The protective cover can also be automatically opened and closed via a telescopic frame to isolate flying debris from causing injury to the operator, thereby achieving safety protection. Attached Figure Description

[0031] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a rotor pressurization fixture;

[0033] Figure 2 This is an internal schematic diagram of a rotor pressurization fixture;

[0034] Figure 3 A schematic diagram showing the structure for the assembly table and stamping equipment to work together;

[0035] Figure 4 This is a top view of the machining center.

[0036] in,

[0037] 1. Workbench; 101. Machining stand; 102. CNC robotic arm; 103. Protective cover; 104. Telescopic frame;

[0038] 2. Positioning device; 201. Elastic telescopic sleeve; 202. Collision contact platform;

[0039] 3. Assembly table; 301. Stamping base; 302. Lifting assembly; 303. Fixed base;

[0040] 4. Stamping equipment; 401. Drive assembly; 402. Guide assembly; 403. Rotor pressurization expansion head. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] Example 1

[0044] like Figure 1-4 As shown, this embodiment discloses a jig for pressurizing a rotor, including: a workbench 1, a positioning device 2, an assembly table 3, and a stamping device 4; the assembly table 3 is installed on the workbench 1, and the stamping device 4 is movably disposed above the assembly table 3.

[0045] The positioning device 2 includes an elastic telescopic sleeve 201 and a collision contact platform 202. The elastic telescopic sleeve 201 is rigidly connected to the drive end of the stamping equipment 4. The collision contact platform 202 is fixed to the top of the assembly table 3 and is coaxially arranged with the elastic telescopic sleeve 201. A telescopic spring striker is nested inside the elastic telescopic sleeve 201. The collision contact platform 202 is provided with a sensing groove that contacts the spring striker, which is used to provide real-time feedback on the pressing depth of the stamping equipment 4.

[0046] A sensor is installed in the sensing groove of the collision contact platform 202, and the elastic telescopic sleeve 201 makes deformation contact with the sensor in the sensing groove through the spring striker.

[0047] Specifically, the workbench 1 includes a machining base (integrating multiple assembly stations), a CNC robotic arm 102 (with slide rail movement function), and a retractable protective cover 103 (driven to open and close via a telescopic frame 104).

[0048] Assembly table 3 consists of a stamping base 301 and a lifting assembly 302. The surface of the stamping base 301 is equipped with a collision contact platform 202, and the bottom is connected to a hydraulic lifting mechanism (stroke ±50mm, accuracy ±0.01mm).

[0049] The contact table 202 is mounted on the stamping seat 301 via the fixing seat 303.

[0050] The stamping equipment 4 includes a servo motor drive assembly 401, a linear guide rail guide assembly 402, and a rotor pressurizing expansion head 403 (a dual-stage pressurizing module consisting of a carbide block and an expansion head).

[0051] During operation, the CNC robotic arm 102 of the workbench 1 moves along the slide rail to the position of the assembly table 3 to be processed, and the protective cover 103 is automatically opened through the telescopic frame 104.

[0052] The operator then places the rotor on the stamping seat 301 of the assembly table 3, and the lifting component 302 adjusts the height of the stamping seat 301 to ensure that the rotor shaft hole is coaxial with the rotor pressurizing expansion head 403.

[0053] When the stamping equipment 4 is started, the drive component 401 drives the elastic telescopic sleeve 201 to press down, and the spring striker contacts the sensing groove of the collision contact platform 202; the sensor of the piezoelectric film detects the contact force and records the displacement of the spring striker, and the sensor data is transmitted in real time to the PLC controller that controls the stamping equipment 4, thereby automatically calibrating the contact distance between the stamping equipment 4 and the rotor.

[0054] The carbide block is pressed down onto the rotor shaft surface, and a uniform radial pressure (50-100kN) is applied, so that the rotor is pressed into the assembly table 3; the expansion head (4-lobed split structure) slides along the central shaft hole of the block, and is hydraulically driven to expand (interference amount 0.03mm), thereby eliminating the lamination gap and realizing the interference fit of the rotor shaft hole;

[0055] The contact stress distribution is monitored in real time by a piezoelectric film sensor. The collision contact platform 202 is electrically connected to the stamping equipment 4. When the sensor deforms, the electrical signal drives the stamping equipment 4 to stamp the rotor. If local overpressure (>120MPa) is detected, the expansion speed of the expansion column head is immediately adjusted to avoid rotor deformation. Alternatively, the contact distance between the assembly table and the stamping equipment 4 can be operated by manually observing its sensor array. After the CNC robotic arm 102 completes the current rotor pressurization, it moves along the slide rail to the next station and repeats the pressurization work.

[0056] During compressor rotor assembly, an integrated piezoelectric thin-film sensor (range 0-500N, accuracy ±0.5% FS) is installed in the sensing slot. The elastic telescopic sleeve 201 has a built-in spring striker that triggers feedback from the piezoelectric thin-film sensor when it contacts the sensing slot. The sensor data is transmitted in real time to the PLC controller that controls the stamping equipment 4, thereby automatically calibrating the contact distance between the stamping equipment 4 and the rotor. Then, through the combination of quick-change expansion head (minimum outer diameter 1mm) and miniature hard alloy block, the shaft hole interference fit of micro / medium-sized compressors is supported.

[0057] In one specific implementation, the assembly table 3 includes a stamping base 301 and a lifting assembly 302. The stamping base 301 is disposed on the worktable 1, and the lifting assembly 302 is connected to the bottom of the worktable 1 to drive the stamping base 301 to move up and down.

[0058] The stamping equipment 4 includes a drive assembly 401, a guide assembly 402, and a rotor pressurizing expansion head 403; the drive assembly 401 is disposed above the assembly table 3; the rotor pressurizing expansion head 403 is suspended and connected to the drive assembly 401 below through the guide assembly 402;

[0059] The rotor pressurizing expansion head 403 includes a hard alloy block that pressurizes the entire rotor shaft surface and an expansion head that pressurizes the rotor shaft hole. The expansion head slides into the central shaft hole of the hard alloy block. The hard alloy block and the expansion head are respectively connected to the drive assembly 401.

[0060] Specifically, the stamping base 301 is fixed to the surface of the worktable 1, and is made of high-strength cast iron. A circular positioning groove is provided on the surface to fix the rotor to be processed.

[0061] The lifting assembly 302 is installed at the bottom of the worktable 1 and is driven by a ball screw mechanism by a servo motor to realize the vertical lifting of the stamping seat 301 (stroke ±50mm, repeatability ±0.005mm).

[0062] The drive assembly 401 uses a dual-axis servo motor (rated torque 20 N·m) to independently control the axial movement of the carbide block and the expansion head.

[0063] The guide assembly 402 consists of a linear guide rail and a linear bearing, ensuring that the verticality error of the rotor pressurization expansion head 403 is ≤0.01mm / m when it is pressed down.

[0064] The outer diameter of the cemented carbide block matches the rotor shaft hole (tolerance H7 / g6), and the surface is coated with a diamond-like coating (friction coefficient ≤0.1) to apply radial pressure to the entire rotor shaft surface.

[0065] The expansion head is composed of a high-carbon steel block, with an embedded conical sleeve that slides into the central shaft hole of the carbide block. It is hydraulically driven to achieve radial expansion (stroke 0-5mm).

[0066] During operation, the operator places the rotor 5 into the circular groove of the stamping seat 301. The lifting component 302 adjusts the height of the stamping seat 301 according to the preset program so that the center line of the rotor shaft hole is coaxial with the rotor pressure expansion head 403 (with laser alignment instrument for calibration, coaxiality ≤0.02mm).

[0067] Then, the drive assembly 401 is activated, and the carbide block presses down along the guide assembly 402. After contacting the rotor shaft surface, it applies radial pressure (50-150kN, programmable control).

[0068] The piezoelectric film sensor of positioning device 2 provides real-time feedback on pressure distribution. If local pressure exceeds the limit (such as due to rotor ellipticity deviation), the system automatically fine-tunes the horizontal position of stamping seat 301.

[0069] Example 2

[0070] like Figure 1-4 As shown, this embodiment discloses a jig for pressurizing a rotor; the workbench 1 includes a machining base 101, a CNC robotic arm 102 and a protective cover 103; the machining base 101 is provided with a plurality of assembly tables 3 for receiving rotors, the assembly tables 3 are provided with a protective cover 103 outside, the CNC robotic arm 102 is provided above the machining base 101, and the CNC robotic arm 102 is connected to a stamping device 4 for stamping the rotor on the assembly table 3;

[0071] The top of the CNC robotic arm 102 is equipped with a slide rail, and the CNC robotic arm 102 is connected to the slide rail and can slide along the length of the slide rail.

[0072] A telescopic frame 104 is provided above the processing base 101. The telescopic frame 104 is connected to the protective cover 103 and is used to drive the protective cover 103 to open and close.

[0073] Specifically, the machining base 101 is a rectangular platform with four assembly stations arranged on its surface. It adopts a T-slot design to support the positioning and modular expansion of the assembly stations.

[0074] The CNC robotic arm 102 is a three-axis linkage robotic arm with an integrated slide rail at the top, which can move along the length of the processing base 101 (stroke 2m), and the end flange is connected to the stamping equipment 4.

[0075] The protective cover 103 is made of transparent acrylic material and is automatically opened and closed by telescopic frame 104 (pneumatically driven). It has a built-in safety light curtain (response time ≤5ms).

[0076] During operation, the operator places the rotor to be processed onto the four assembly tables 3 of the processing base 101 in sequence; then the protective cover 103 automatically closes through the telescopic frame 104, and the stamping process is started after the safety light curtain detects that no personnel have entered.

[0077] The end-effector 4 of the CNC robotic arm 102 descends, and the coaxiality of the rotor shaft hole and the pressure expansion head 403 is calibrated (error ≤ 0.01mm) through a vision system (integrated into the robotic arm). Then, the lifting assembly 302 adjusts the height of the stamping seat 301 to ensure that the rotor shaft surface is in complete contact with the carbide block. Then, a two-stage pressurization process is performed (the carbide block presses down to apply radial pressure, and the expansion head expands hydraulically).

[0078] After a single workpiece is stamped, the CNC robotic arm 102 moves to the next station. After the four stations have finished working, the lifting assembly 302 resets and ejects the finished rotor, the telescopic frame 104 retracts, and the protective cover 103 opens automatically. The operator can then remove the processed rotor and replace it with the rotor to be processed.

[0079] As one specific implementation, the sensor provided in the sensing groove includes a piezoelectric thin film sensor, a capacitive displacement sensor, and an inductive proximity sensor.

[0080] Specifically, the sensing slot is equipped with an integrated piezoelectric thin film sensor (range 0-500N, accuracy ±0.5% FS), and the elastic telescopic sleeve 201 has a built-in spring striker that triggers the piezoelectric thin film sensor to provide feedback when it comes into contact with the sensing slot. The sensor data is transmitted in real time to the PLC controller that controls the stamping equipment 4, thereby automatically calibrating the contact distance between the stamping equipment 4 and the rotor.

[0081] As one specific implementation method, the assembly table 3 and the stamping equipment 4 can be driven by hydraulic drive, pneumatic drive or electric drive.

[0082] Specifically, the hydraulic drive modules of assembly table 3 and stamping equipment 4 are hydraulic drive modules, which are suitable for high-load scenarios (maximum pressure 300kN) and consist of a hydraulic pump station (pressure adjustable from 0-30MPa) and a servo valve.

[0083] When the compressor motor rotor needs to be machined, it must operate under high temperature, high humidity and cyclic load impact for a long time. Hydraulic drive (pressure 200-400kN) is used, and a hard alloy block (surface coated with CrAlN) is used to apply an interference fit of 0.2mm to the compressor rotor shaft hole, which improves the shear strength of the mating surface and meets the fatigue life requirement of 10,000 hours.

[0084] Example 3

[0085] like Figure 1-4 As shown, this embodiment discloses a fixture for pressurizing a rotor; unlike embodiment 1, this embodiment requires multi-sensor cross-validation.

[0086] The collision contact platform 202 is equipped with a piezoelectric thin film sensor and an inductive proximity sensor.

[0087] When the elastic telescopic sleeve 201 falls and collides with the contact table 202, the falling time can be obtained by exciting the piezoelectric film sensor. The contact distance between the assembly table and the stamping equipment 4 can be obtained according to the free fall formula, thereby transmitting signal 1 to the stamping equipment 4.

[0088] When the elastic telescopic sleeve 201 falls and collides with the collision contact table 202, the inductive approach of the elastic telescopic sleeve 201 is triggered synchronously, thereby transmitting signal 2 to the stamping equipment 4; when the stamping equipment 4 receives both transmission signal 1 and transmission signal 2 at the same time, it drives the rotor to be stamped; cross-validation ensures accurate synchronization of force-position signals, improves process stability, and is used in scenarios with stringent data consistency requirements, such as precision servo motors.

[0089] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fixture for pressurizing a rotor, characterized in that, include: Workbench (1), positioning device (2), assembly table (3), stamping equipment (4); the assembly table (3) is installed on the workbench (1), and the stamping equipment (4) is movably arranged above the assembly table (3); The positioning device (2) includes an elastic telescopic sleeve (201) and a collision contact platform (202). The elastic telescopic sleeve (201) is rigidly connected to the drive end of the stamping equipment (4). The collision contact platform (202) is fixed to the top of the assembly table (3) and is coaxially arranged with the elastic telescopic sleeve (201). The elastic telescopic sleeve is nested with a telescopic spring striker. The collision contact platform is provided with a sensing groove that contacts the spring striker, which is used to provide real-time feedback on the pressing depth of the stamping equipment (4).

2. The fixture for pressurizing a rotor according to claim 1, characterized in that, The sensor is installed in the sensing groove of the collision contact platform, and the elastic telescopic sleeve (201) makes deformation contact with the sensor in the sensing groove through the spring striker.

3. The fixture for pressurizing a rotor according to claim 1, characterized in that, The assembly table (3) includes a stamping base (301) and a lifting assembly (302). The stamping base (301) is set on the workbench (1), and the lifting assembly (302) is connected to the bottom of the workbench (1) to drive the stamping base (301) to rise and fall.

4. The fixture for pressurizing a rotor according to claim 1, characterized in that, The stamping equipment (4) includes a drive assembly (401), a guide assembly (402), and a rotor pressurizing expansion head (403); the drive assembly (401) is located above the assembly table (3); the rotor pressurizing expansion head (403) is suspended below the drive assembly (401) through the guide assembly (402).

5. The fixture for pressurizing a rotor according to claim 4, characterized in that, The rotor pressurizing expansion head (403) includes a hard alloy block that pressurizes the entire rotor shaft surface and an expansion head that pressurizes the rotor shaft hole. The expansion head slides into the central shaft hole of the hard alloy block. The hard alloy block and the expansion head are respectively connected to the drive assembly (401).

6. The jig for pressurizing a rotor according to claim 1, characterized in that, The workbench (1) includes a machining base (101), a CNC robotic arm (102), and a protective cover (103); the machining base (101) is provided with a plurality of assembly tables (3) for receiving rotors, the assembly tables (3) are provided with a protective cover (103) outside, the machining base (101) is provided with a CNC robotic arm (102) above, and the CNC robotic arm (102) is connected to a stamping device (4) for stamping the rotors on the assembly tables (3).

7. The jig for pressurizing a rotor according to claim 6, characterized in that, The top of the CNC robotic arm (102) is provided with a slide rail, and the CNC robotic arm (102) is connected to the slide rail and can slide along the length of the slide rail.

8. The jig for pressurizing a rotor according to claim 6, characterized in that, A telescopic frame (104) is provided above the processing base (101), and the telescopic frame is connected to a protective cover (103) for driving the protective cover (103) to open and close.

9. The fixture for pressurizing a rotor according to claim 2, characterized in that, The sensors installed in the sensing slot include piezoelectric thin film sensors, capacitive displacement sensors, and inductive proximity sensors.

10. The jig for pressurizing a rotor according to claim 1, characterized in that, The assembly table (3) and the stamping equipment (4) are driven by hydraulic, pneumatic or electric means.

Images